JP2023081020A - Color matching support device, color matching support method and color matching support program - Google Patents

Abstract

To provide a color matching support device, a color matching support method and a color matching support program which increase convenience of color matching.SOLUTION: A color matching support device 10 executes: processing of making a second device 21 display an operation screen so as to reproduce a color of a control point at a position of the control point in a colorimetric color space, receiving a point that becomes an adjustment destination of the control point through operation of the operation screen, calculating a color value of a data color space associated with the point that becomes the adjustment destination in a display profile 15B and updating the operation screen so as to display the color reproduced by the second device 21 on the basis of the calculated color value; and processing of applying conversion associated with the control point by the color value of the data color space associated with the position that becomes the adjustment destination to a plurality of adjustment points in the colorimetric color space and re-writing association between each adjustment point in the display profile 15B and the color value of the data color space.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a color matching support device, a color matching support method, and a color matching support program.

Output devices such as inkjet printers and laser printers reproduce colors based on subtractive color mixing. Display devices such as liquid crystal monitors and projectors reproduce colors by additive color mixture. Bringing the colors reproduced by the display device closer to the colors reproduced by the output device allows the colors of the printed matter to be the colors intended by the user by performing color calibration based on the colors reproduced by the display device.

Color matching for reproducing colors reproduced by an output device on a display device uses a profile of color reproduction information of the device. The profile describes the relationship between the color values in the data color space input to the device and the colorimetric values in the colorimetric color space of the colors reproduced by the device. A colorimetric value is a value obtained by quantifying human color perception as a psychophysical quantity. A colorimetric match is a perceptual color match. Color matching is based on the data values input to the output device so that the colorimetric values of the colors reproduced by the color values input to the output device match the colorimetric values of the colors reproduced by the color values input to the display device. Performs color conversion to data values to be input to the display device. Focusing on the correspondence between the data color spaces of two devices in color matching, the color space of colorimetric values functions as a profile connection space (hereinafter simply referred to as PCS (Profile Connection Space)) in a profile. .

The output profile, which is the profile of the output device, for example, associates the color values of the CMYK color space, which is the data color space, with the colorimetric values of the CIELAB color space, which is the colorimetric color space. The display profile, which is the profile of the display device, associates, for example, the color values of the RGB color space, which is the data color space, with the colorimetric values of the CIELAB color space, which is the colorimetric color space. The profile describes, in various formats, information that associates the color space of data input to the device with the PCS. An output device such as an output device mainly uses a lookup table format in which PCS is a CIELAB color space. The display device mainly uses the TRC-Matrix model format in which PCS is the CIEXYZ color space. The display also uses a lookup table format with PCS in the CIEXYZ color space. In this case, the PCS may be the CIELAB color space as well as the CIEXYZ color space. Also, the CIEXYZ color space and the CIELAB color space can be mutually reversibly color-converted.

In color matching, the output profile is used to forward color-convert the color values of the image data for printing into PCS colorimetric values. In color matching, the display profile is used to inversely transform the PCS colorimetric values converted by the output profile into color values in the RGB color space, and the image is displayed using the color values in the RGB color space.

For example, the output profile is created based on the relationship between the color values of the image data for printing and the PCS colorimetric values, using the colorimetric values of the color patches printed by the output device as the PCS colorimetric values. For example, the display profile is created based on the relationship between the color values of the display image data and the PCS colorimetric values, using the colorimetric values of the color patches displayed by the display device as the PCS colorimetric values.

On the other hand, the environment in which the printed color patches are observed by the output device is not a little different from the PCS standard in which the D50 standard light source is set to a white value. It creates a difference between color perception in the environment. Also, in calculations when the display device displays color patches, normalization is performed based on the maximum output of the display device. It also makes a difference between color values.

Differences between the colorimetric values of the printed color patches and the actual PCS colorimetric values, and the differences between the colorimetric values of the displayed color patches and the actual PCS colorimetric values greatly increase the accuracy of color matching. will lower it. Therefore, in the above-mentioned field of color matching, it has been proposed to apply the colorimetric value of the print medium under a predetermined illumination light to the white reference value of the output profile and also to the white reference value of the display profile. (See Patent Document 1, for example).

Japanese Patent Application Laid-Open No. 2005-94400

As described above, applying the colorimetry of one print medium to the output profile's white reference value and also to the display profile's white reference value matches the display profile's reference to the output profile's reference. This suppresses the deterioration of the accuracy of color matching.

However, color matching, which requires a dedicated colorimetric device for obtaining colorimetric values of print media and displays, still leaves room for improvement in terms of enhancing the convenience of color matching.

A color matching support device for solving the above-mentioned problems comprises forward color reproduction information that associates a color value in a data color space with a point in a colorimetric color space; and a storage unit for storing color values of the data color space associated with points of the colorimetric color space using the backward color reproduction information. A color matching support device for a display device that reproduces the color of a point, and includes a color adjusting unit that brings the color reproduced by the display device closer to a target color. The color adjustment unit causes the display device to display an operation screen so as to indicate the control point at the position of the control point in the colorimetric color space, and adjusts the control point through the operation of the operation screen. Applying to a plurality of adjustment points in the colorimetric color space a process of accepting a destination point and a transformation in which color values of the data color space associated with the point to be adjusted are associated with the control points. and rewriting the correspondence between each adjustment point in the backward color reproduction information and the color value in the data color space.

A color matching support method for solving the above problems comprises forward color reproduction information that associates a color value in a data color space with a point in a colorimetric color space; and a storage unit for storing color values of the data color space associated with points of the colorimetric color space using the backward color reproduction information. This color matching support method targets a display device that reproduces the color of a point, and uses a color adjusting unit that brings the color reproduced by the display device closer to a target color. The color adjustment unit causes the display device to display an operation screen so as to indicate the control point at the position of the control point in the colorimetric color space, and adjusts the control point through the operation of the operation screen. Applying to a plurality of adjustment points in the colorimetric color space a process of accepting a destination point and a transformation in which color values of the data color space associated with the point to be adjusted are associated with the control points. and rewriting the correspondence between each adjustment point in the backward color reproduction information and the color value of the data color space.

A color matching support program for solving the above-mentioned problems is provided by a color matching support device that provides forward color reproduction information that associates points in a colorimetric color space with color values in a data color space, a storage unit for storing backward color reproduction information that associates a color value of the data color space with a point; and the data color that is associated with the point of the colorimetric color space using the backward color reproduction information. A color matching support program intended for a display device that reproduces a color value of a space as the color of the point, and functions as a color adjusting unit that brings the color reproduced by the display device closer to the target color. The color matching support program causes the color adjustment unit to display an operation screen on the display device so as to indicate the control point at the position of the control point in the colorimetric color space, and operate the operation screen. and a transformation in which the color value of the data color space associated with the control point is associated with the control point, in the colorimetric color space. applying to a plurality of adjustment points, thereby rewriting the correspondence between each adjustment point in the backward color reproduction information and the color value of the data color space.

According to each of the above configurations, the comparison between the position of the control point reproduced by the display device and the position of the point to be adjusted for the control point is performed based on the user's visual observation on the operation screen. At this time, the color of the point to be adjusted can be specified according to the forward color reproduction information regardless of the backward color reproduction information. The transformation in which the color values of the data color space associated with the points to be adjusted are associated with the control points is reflected in each adjustment point in the backward color reproduction information. As a result, the display device using the backward color reproduction information can bring the color reproduced by the display device closer to the target color without requiring a dedicated colorimetry device or a dedicated display device.

In the above-described color matching support device, the color adjustment unit converts the color value of the data color space associated with the point to be adjusted in the forward color reproduction information into the forward direction color value in the process of rewriting the association. It may be calculated using color reproduction information.

When processing to calculate points in the colorimetric color space from the color values in the data color space is required, for example, when the colors reproduced by the output device are reproduced on the display device, the image data used by the output device is forward color reproduction. Information is transformed into points in the colorimetric color space. According to the above configuration, since the color value of the data color space associated with the point to be adjusted in the colorimetric color space is calculated using the forward color reproduction information itself, the color of the point to be adjusted Greater precision with respect to values.

In the color matching support device, the color adjustment unit refers to a point in the colorimetric color space predetermined in the backward color reproduction information, and uses the point as the adjustment point in the process of rewriting the association. may be used.

According to the above configuration, the backward color reproduction information is referred to, and the point itself of the colorimetric color space predetermined in the backward color reproduction information is adopted as the adjustment point. You can also reduce the load.

In the above-described color matching support device, the color adjustment unit reproduces the control point as a color at the position of the control point in the colorimetric color space in the process of receiving the point to be adjusted for the control point. (2) displaying the operation screen on the display device, receiving the point to be adjusted for the control point through the operation of the operation screen, and thereby matching the point to be adjusted in the forward color reproduction information; The operation screen may be updated so as to calculate the color values of the data color space to be attached, and display the colors reproduced by the display device based on the calculated color values.

According to the above configuration, the comparison between the color of the control point reproduced by the display device and the color of the point to be adjusted for the control point is performed based on the user's visual observation on the operation screen. Therefore, the load required for visual judgment related to the difference between the control point and the point to which the control point is to be adjusted is reduced.

In the above color matching support device, the coordinate values of the control points are coordinate values in a color space that undergoes reversible transformation with lightness values, chroma values, and hue values, and include coordinate values indicating chromatic colors, and the color adjustment The unit converts the coordinate values of the control points into lightness values, saturation values, and hue values in the process of updating the operation screen, and indicates the positions of the control points on the lightness-saturation-hue coordinate system. is displayed on the display device, and the lightness value, the saturation value, and the hue value are received as the points to be adjusted for the control points, thereby obtaining the lightness value, the saturation value, the points to be adjusted, and converting the hue value into a coordinate value of a control point, calculating the color value of the data color space associated with the converted coordinate value of the control point in the forward color reproduction information, and calculating the calculated color The operation screen may be updated to display colors reproduced by the display device based on the values.

According to the above configuration, the color reproduced by the display device is compared with the target color in the lightness-chroma-hue coordinate system displayed on the operation screen. As a result, the positions of the control points and the points to which the control points are adjusted form a coordinate system in which the positions of the points can be easily grasped intuitively by the user. Therefore, it is possible to prompt the user to adjust the control points while allowing the user to view the positions of the colorimetric values reproduced by the display device in the colorimetric color space with higher accuracy.

In the above-described color matching support device, the control points are LAB values, and the color adjustment unit converts the LAB values to LCH values in the process of updating the operation screen, and converts the positions of the control points to LCH coordinates. displaying the operation screen shown in the system on the display device, receiving an LCH value as a point to be adjusted for the control point, thereby converting the LCH value, which is the point to be adjusted, into a LAB value; calculating the color values of the data color space associated with the converted LAB values in the forward color reproduction information, and displaying the colors reproduced by the display device based on the calculated color values; The operation screen may be updated.

According to the above configuration, the color reproduced by the display device and the target color are compared in the LCH coordinate system displayed on the operation screen. As a result, the positions of the control points and the points to which the control points are adjusted form a coordinate system in which the positions of the points can be easily grasped intuitively by the user. Therefore, it is possible to prompt the user to adjust the control points while allowing the user to view the position of the color reproduced by the display device in the color space with higher accuracy.

In the above color matching support device, the color adjustment unit may receive a point to be adjusted for the control point by an operation of moving the control point in the lightness-saturation-hue coordinate system displayed on the operation screen. According to this configuration, it is easier for the user to visually recognize the position of the point to which the control point is to be adjusted.

In the color matching support device described above, the color adjustment unit may receive a point to be adjusted for the control point by an operation of moving the control point in the LCH coordinate system displayed on the operation screen. According to this configuration, it is easier for the user to visually recognize the position of the point to which the control point is to be adjusted.

In the above-described color matching support device, the control points include chromatic control points and achromatic control points, and the color adjustment unit serves as an adjustment destination for the chromatic control points in the process of rewriting the correspondence. a transformation in which the color values in the data color space associated with the points are associated with the chromatic color control points; applying a combined transform with a transform associated with a chromatic control point to a plurality of adjustment points in the colorimetric color space, thereby combining each adjustment point in the inverse color reproduction information with a color in the data color space; You can rewrite the association with the value.

According to the above configuration, the adjustment regarding the chromatic color control point and the adjustment regarding the achromatic control point are reflected in the adjustment of each adjustment point. As a result, the display device using the rewritten backward color reproduction information can accurately adjust colors between the chromatic color control point and the achromatic color control point.

FIG. 1 is a block diagram showing the configuration of a color matching support device. FIG. 2 is a color space diagram showing the CIELAB color space and LCH coordinates. FIG. 3 is a color space diagram showing the configuration of the CLUT of the display profile. FIG. 4 is a color space diagram showing control points in the CIELAB color space. FIG. 5 is a flow chart showing the flow of processing in the color matching support method. FIG. 6 is a flow chart showing the flow of profile rewriting processing in the color matching support method. FIG. 7 is a data configuration diagram showing a reference chromatic color definition list. FIG. 8 is a data configuration diagram showing chromatic color adjustment amount data. FIG. 9 is a data configuration diagram showing a reference achromatic color definition list. FIG. 10 is a data configuration diagram showing achromatic color adjustment amount data. FIG. 11 is a screen configuration diagram showing an operation screen before changing the adjustment amount of the chromatic control points. FIG. 12 is a screen configuration diagram showing an operation screen after changing the adjustment amount of the chromatic control points. FIG. 13 is a screen configuration diagram showing the operation screen before the adjustment amount of the achromatic control point is changed. FIG. 14 is a screen configuration diagram showing an operation screen after changing the adjustment amount of the achromatic control point. FIG. 15 is a chromaticity diagram showing the process of calculating the chromatic color adjustment amount. FIG. 16 is a color space diagram showing the process of calculating the achromatic color adjustment amount. FIG. 17 is a chromaticity diagram showing combination of adjustment amounts. FIG. 18 is a chromaticity diagram showing the positions of chromatic color control points. FIG. 19 is a chromaticity diagram showing color reproduction by color matching before color adjustment. FIG. 20 is a chromaticity diagram showing color reproduction by color matching after color adjustment. FIG. 21 is a chromaticity diagram showing color reproduction described by a display profile before color adjustment. FIG. 22 is a chromaticity diagram showing color reproduction described by a display profile after color adjustment. FIG. 23 is a color space diagram showing the process of calculating the color adjustment amount in the modified example. FIG. 24 is a chromaticity diagram showing the process of calculating the color adjustment amount in the modified example. FIG. 25 is a block diagram showing the configuration of a color matching support device in a modified example.

An embodiment of a color matching support device, a color matching support method, and a color matching support program will be described.
[Summary of support device]
As shown in FIG. 1, the color matching support device 10 is used for desktop publishing (DTP) required for digital printing, plate making, electronic publishing, and graphic design. The color matching support device 10 is used for online proofreading (remote proofing), which is monitor proofreading using a network, among various situations in which DTP is used.

The color matching support device 10 provides the user 55 with the color reproduction of the color patch on the second device 21 for the color of the color patch reproduced by the first device 52 . Based on an instruction from the user 55, the color matching support device 10 causes the second device 21 to reproduce colors so that the colors reproduced by the second device 21 are closer to the colors of the color patches 53 reproduced by the first device 52. Rewrite the profile that applies to

This embodiment shows an example in which a system including the color matching support device 10 includes an output device as the first device 52 and a display device as the second device 21 . Then, based on an instruction from the user 55, the color matching support device 10 causes the second device 21 to make the color reproduced by the second device 21 closer to the color of the color patch 53 reproduced by the first device 52. An example of rewriting the profile applied for matching will be explained.

In another embodiment, the system including the color matching support device 10 may include a display device as the first device 52 and a display device as the second device 21 . That is, the first device 52 may be at least one of an output device and a display device. The second device 21 is a display device.

[Summary of support method]
The color matching support device 10 uses the reference color definition list 50 to support color matching. The colors in the reference color definition list 50 are commonly used by the first device 52 and the second device 21 .

The color matching support device 10 converts the colors in the reference color definition list 50 into the data color space used for input by the first device 52, thereby generating image data 51 representing colors after conversion.

The color matching support device 10 converts the colors in the reference color definition list 50 into the data color space used by the second device 21 for input, thereby causing the second device 21 to display the converted colors.
The output device, which is the first device 52, reproduces colors based on subtractive color mixing. Examples of output devices are various printers such as inkjet printers and laser printers.

The first device 52 takes as input color values in the data color space, which is a device dependent color space, and processes the colors. The first device 52 reproduces colors in the data color space into color patches 53 . The first device 52 reproduces the colors of the color patches 53 based on the image data 51 . The colors of the color patches 53 reproduced by the first device 52 are provided to the user 55 . The color of the color patch 53 reproduced by the first device 52 is used for visual judgment by the user 55 .

The display device, which is the second device 21, reproduces colors by additive color mixture. Examples of display devices are various displays such as liquid crystal displays and organic EL displays. The second device 21 receives color values in the data color space, which is a device dependent color space, and processes the colors. The second device 21 receives support for color matching by the color matching support device 10 , thereby bringing the color reproduced by the second device 21 closer to the color reproduced by the first device 52 .

The color matching support device 10 converts the colors in the reference color definition list 50 into the data color space to which the colors processed by the second device 21 belong. The second device 21 reproduces chromatic colors on the operation screen 21A (see FIGS. 11 and 12). The second device 21 reproduces an achromatic color on the operation screen 21B (see FIGS. 13 and 14). The colors reproduced by the second device 21 are presented to the user 55 and used for visual judgment by the user 55 .

The color matching support device 10 causes the second device 21 to display the operation screens 21A and 21B. Based on an instruction from the user 55 through the operation screens 21A and 21B, the color matching support device 10 causes the second device 21 to reproduce the color from the reference color definition list 50 in the operation screens 21A and 21B, to the second color. Allow device 21 to make further changes.

The color matching support device 10 rewrites B2A of the display profile 15B based on the instruction of the user 55 through the operation screens 21A and 21B. B2A of the display profile 15B is used for color space conversion. Color space conversion using B2A of the display profile 15B converts the PCS to the data color space to which the colors processed by the second device 21 belong.

The color matching support device 10 brings the color reproduced from the reference color definition list 50 by the second device 21 closer to the color reproduced from the reference color definition list 50 by the first device 52 by rewriting B2A of the display profile 15B.

The user 55 operates the operation screens 21A and 21B to instruct the color matching support device 10 on the degree of change of the colors reproduced on the operation screens 21A and 21B. The user 55 refers to the colors of the color patches 53 provided by the first device 52, and adjusts the colors reproduced on the operation screens 21A and 21B so that the colors of the color patches 53 are displayed on the operation screens 21A and 21B. Indicate the degree of change. As a result, the colors reproduced from the reference color definition list 50 by the second device 21 are brought closer to the colors reproduced from the reference color definition list 50 by the first device 52 .

[Color Space]
The color matching of the first device 52 uses three different color spaces. The three color spaces are the data color space of the source profile 15A, the data color space of the output profile of the first device 52, and PCS. Color matching of the first device 52 uses two types of profiles. The two types of profiles are the source profile 15A and the first device 52 output profile.

The color matching of the second device 21 uses three color spaces. The three color spaces are the data color space of source profile 15A, the data color space of display profile 15B of second device 21, and PCS. The color matching of the second device 21 uses two types of profiles. The two types of profiles are the source profile 15A and the second device 21 display profile 15B.

In addition, in the present embodiment, the color matching support device 10 supports the color matching of the second device 21 . Such a color matching support device 10 uses the source profile 15A and the display profile 15B of the second device 21 for color matching.

PCS is a colorimetric color space. A colorimetric color space is a color space based on colorimetric values obtained by quantifying human color perception as a psychophysical quantity. The PCS functions as an interface for connecting the source profile 15A and the output profile. The PCS functions as an interface for connecting the source profile 15A and the display profile 15B.

The source profile 15A is a profile describing color reproduction of input data in color matching. An output profile is a profile describing color reproduction of an output device in color matching. The display profile 15B is a profile describing the color reproduction of the display device in color matching.

PCS is, for example, CIE 1931 XYZ color space, CIE 1976 L ^* a ^* b ^* color space. CIE is an abbreviation for International Commission on Illumination. Hereinafter, the CIE 1931 XYZ color space is also referred to as the CIEXYZ color space or the XYZ color space. The CIE 1976 L ^* a ^* b ^* color space is also referred to as the CIELAB color space or LAB color space. In addition, the colorimetric values in the CIEXYZ color space are also described as XYZ values, the colorimetric values in the CIELAB color space as LAB values, and the colorimetric values in LCH coordinates obtained by converting the chromaticity components AB in the CIELAB color space to polar coordinates as LCH values. . The LCH coordinate system is an example of a lightness-chroma-hue coordinate system in which a lightness value, a saturation value, and a hue value represent a point.

The color matching support device 10 uses chromatic control points Pn (see FIG. 4), achromatic control points Qn (see FIG. 4), and adjustment points Xn (see FIG. 3) for color matching support. The color space of the chromatic color control points Pn, the color space of the achromatic color control points Qn, and the color space of the adjustment points Xn are color spaces made up of lightness and chromaticity components. The color space of the chromatic color control points Pn, the color space of the achromatic color control points Qn, and the color space of the adjustment points Xn can be reversibly converted to PCS. The color space of the chromatic color control points Pn, the color space of the achromatic color control points Qn, and the color space of the adjustment points Xn may be the same color space as the PCS, or may be a color space different from the PCS.

This embodiment shows an example in which the PCS is the CIELAB color space. AB coordinates representing chromaticity of LAB values are converted to CH coordinates, which are polar coordinates.
As shown in FIG. 2, for example, the coordinates of point 11S3 in the CIELAB color space (white circle in the figure) are transformed from LAB coordinates to LCH coordinates.

The LCH coordinate values are obtained by using lightness L from black Bk "0" to white W "100", saturation C indicating vividness of color, and hue angle H from 0 degrees to 360 degrees. Colors are quantified on the H and saturation/lightness plane 11S1.

The hue angle H goes from 0 degrees to 90 degrees, magenta, red, yellow red, yellow. The hue angle H changes from yellow to yellow green to green from 90 degrees to 180 degrees. The hue angle H changes from 180 degrees to 270 degrees to green, cyan, and blue. The hue angle H changes from blue to magenta blue to magenta from 270 degrees to 360 degrees.

The LCH value represents the three attributes of color, lightness, saturation, and hue, for chromatic colors. The LCH value makes it easier for the user 55 to visually grasp the relationship between the color value and the color reproduced based on the colorimetric value, compared to other colorimetric values such as the orthogonal coordinate representation of the CIELAB color space. .

The color matching support device 10 displays the coordinate axes of the LCH coordinate system on the operation screen 21A. The color matching support device 10 displays the coordinate axes of the LAB coordinate system on the operation screen 21B. The color matching support device 10 arranges the colors reproduced by the second device 21 based on the colorimetric values of the LCH coordinate system in the LCH coordinate system of the operation screen 21A specified based on the coordinate axes. The color matching support device 10 arranges the colors reproduced by the second device 21 based on the colorimetric values of the LAB coordinate system in the LAB coordinate system of the operation screen 21B specified based on the coordinate axes.

The color matching support device 10 provides the operation screen 21A by associating a coordinate system in which the user 55 can easily grasp the positional relationship of chromatic colors in the color space with the colors reproduced by the second device 21 . Thereby, the color matching support device 10 allows the user 55 to visually compare the degree of difference between the color of the color patch 53 and the color reproduced by the second device 21 in the LCH coordinate system.

The color matching support device 10 allows the user 55 to view the difference between the achromatic color reproduced by the second device 21 and other achromatic colors as a positional relationship on the LAB coordinate system. The color matching support device 10 allows the user 55 to view the difference between the chromatic color reproduced by the second device 21 and other chromatic colors as the positional relationship on the LCH coordinate system.

The color matching support device 10 allows the user 55 to indicate the LCH value of the chromatic color control point Pn on the operation screen 21A. The color matching support device 10 causes the second device 21 to reproduce the color of the chromatic color control point Pn based on the LCH value indicated by the user 55 . The color matching support device 10 instructs the user 55 on the degree of change of the chromatic color to be reproduced by the second device 21 on the LCH color coordinate system, in which the relationship between the coordinates on the color space and the color can be easily grasped. Let This makes it easier for the color matching support device 10 to reflect the intention of the user 55 in changing the color reproduced by the second device 21 .

The color matching support device 10 allows the user 55 to indicate the LAB value of the achromatic color control point Qn on the operation screen 21B. The color matching support device 10 causes the second device 21 to reproduce the color of the achromatic control point Qn based on the LAB value specified by the user 55 . The color matching support device 10 determines the degree of change of the achromatic color to be reproduced by the second device 21 on the LAB coordinate system, in which the relationship between the coordinates in the color space and the color can be easily grasped for colors around the achromatic color. instruct This makes it easier for the color matching support device 10 to reflect the intention of the user 55 in changing the color reproduced by the second device 21 .

The data color space of the output device is a different color space than the data color space of the display device. An example of a data color space for an output device is the CMYK color space. The CMYK color space, which is the data color space of the output device, is a color space that requires specialized knowledge of color mixing in handling its color values.

The data color space of the display device is a different color space than the data color space of the output device. An example of a data color space for a display device is the RGB color space. The RGB color space, which is the data color space of the display device, is a color space that requires specialized knowledge of color mixing in handling its color values.

[Profile]
An example of the two types of profiles used by the color matching support device 10 is data conforming to the ICC (International Color Consortium) profile format. The two types of profiles used by the color matching support device 10 each include AtoBTag and BtoATag.

AtoBTag is hereinafter also referred to as A2B. A2B is data for forward color conversion from the data color space to the PCS. A2B is an example of forward color reproduction information. BtoATag is hereinafter also referred to as B2A. B2A is data for reverse color conversion from PCS to data color space. B2A is an example of backward color reproduction information.

An example of A2B consists of an input curve, a color lookup table, and an output curve. A color lookup table is also described as a CLUT. For example, an A2B CLUT is a three-dimensional LUT, a four-dimensional LUT, or a high-dimensional LUT, with one dimension for each dimension in the color values of the data color space. The A2B input curve maps the grid points of the CLUT to the color values of the data color space applied to the profile.

The color matching support device 10 uses the A2B CLUT to identify memory addresses associated with color values in the data color space. The color matching support device 10 uses the A2B CLUT to read the PCS colorimetric values stored in the specified memory address. The lattice points in the A2B CLUT are also described as the A2B grid.

An example of B2A consists of an input curve, a color lookup table, and an output curve. For example, the B2A CLUT has one dimension for each dimension in the PCS colorimetry. The B2A CLUT is a three-dimensional LUT. The B2A input curve maps the CLUT grid points to the PCS colorimetry applied to the profile.

As FIG. 3 shows, the B2A CLUT has one dimension for each dimension in the PCS colorimetry applied to the CLUT. The B2A CLUT is a three-dimensional LUT whose memory address is a grid point including the origin. The dimensions in the PCS applied to the CLUT are L dimension, a dimension, and b dimension.

The color matching support device 10 rewrites B2A of the display profile 15B of the second device 21 . That is, the color matching support device 10 rewrites the input curve, CLUT, and output curve that constitute B2A of the display profile 15B.

Another example of a display profile 15B may consist of a TRC and a color transformation matrix tag. When the display profile 15B is composed of TRC and color conversion matrix tags, the color matching support device 10 converts the TRC and color conversion matrix into an input curve, a CLUT, and an output curve that constitute A2B. may also be converted into input curves, CLUTs, and output curves that make up B2A.

The B2A is configured to map the PCS colorimetric values to the CLUT grid points through the input curve, and to identify the memory addresses associated with the grid points. B2A applies the grid points specified by the input curve to the CLUT and holds the data color space color value 15BCT at the memory address associated with the CLUT grid point. The data color space color values 15BCT in display profile 15B are RGB values. The lattice points in the CLUT of B2A are also described as the grid of B2A.

The color matching support device 10 treats the PCS colorimetric values associated with the lattice points in the B2A CLUT as adjustment points Xn. The color matching support device 10 rewrites the RGB values of the color value 15BCT for the memory address associated with the adjustment point Xn in the data color space of the display profile 15B. Rewriting of color value 15BCT is rewriting of B2A in display profile 15B.

Color matching is handled based on the connection between A2B and B2A via PCS. A2B used for color matching is forward color reproduction information in a profile describing color reproduction of input data. B2A used for color matching is backward color reproduction information in the profile of the device that outputs or displays the input data. A profile that describes the color reproduction of input data in color matching is referred to as a source profile. On the other hand, a profile of a device that outputs or displays data in color matching is also referred to as a destination profile.

The first device 52 color-converts the input data into color values of the CMYK color space, which is the data color space of the first device 52, and outputs the color values. The first device 52 uses A2B in the source profile 15A and B2A in the output profile of the first device 52, which is the destination profile, for color conversion of the input data.

The second device 21 color-converts the input data into color values of the RGB color space, which is the data color space of the second device 21, and displays the color values. The second device 21 uses A2B in the source profile 15A and B2A in the display profile 15B of the second device 21, which is the destination profile, for color conversion of the input data.

In this way, the output of the first device 52 and the display of the second device 21 are color matched with respect to the same source profile 15A. Thereby, the output of the first device 52 and the display of the second device 21 are color-matched. The source profile 15A is common to the first device 52, the second device 21, and the color matching support device 10. FIG.

Source profile 15A may be a profile standardized by a printing standard. An example of the standardized source profile 15A is Japan Color 2001 conforming to the printing standard ISO12647. The first device 52 reproduces the color of the color patch 53 using the source profile 15A.

Display profile 15B is the destination profile of second device 21 . The display profile 15B may be a profile standardized by the monitor standard in the color matching support device 10. FIG. An example of the standardized display profile 15B is sRGB, Adobe RGB, Display P3, etc. established by the International Electrotechnical Commission (IEC). When the display profile 15B is composed of TRC and color conversion matrix, it is converted to A2B/B2A as described above.

Color matching is based on the connection through the PCS, and is based on the A2B forward color reproduction information of the profile describing the color reproduction of the input data and the profile describing the color reproduction of the device that outputs or displays the input data. This is achieved by using B2A, which is backward color reproduction information.

The data color space of the color values input to the first device 52 is the CMYK color space. The first device 52 uses the forward color reproduction information A2B of the source profile and the backward color reproduction information B2A in the profile of the first device 52 to convert CMYK, the data color space of the first device 52 . Performs color matching of color values in a color space. That is, the first device 52 performs color matching using the source profile 15A and the destination profile, which is an output profile that describes the color reproduction of the first device 52 . Through such color matching, the first device 52 reproduces the color values of the image data 51 according to the color reproduction of the source profile 15A.

The data color space of the color values input to the second device 21 is the RGB color space. The second device 21 uses the forward color reproduction information A2B of the source profile and the backward color reproduction information B2A in the profile of the second device 21 to convert the RGB data color space of the second device 21 into Performs color matching of color values in a color space.

That is, the second device 21 performs color matching using the source profile 15A and the display profile 15B describing the color reproduction of the second device 21 . Through such color matching, the second device 21 reproduces the color values of the image data 51 according to the color reproduction of the source profile 15A.

[Reference color definition list 50]
As shown in FIG. 4, the chromatic color control point Pn is the outermost vertex in the color gamut of the source profile 15A. The chromatic color control points Pn are used for color adjustment of the second device 21 . The chromatic control points Pn are different from the adjustment points Xn. Adjustment points Xn correspond to the grid specified by the CLUT of B2A.

The chromatic color control points Pn may include points on the edge line connecting the outermost vertices in the color gamut of the source profile 15A. Also, the chromatic color control points Pn may include points on the surface including the three outermost vertices in the color gamut of the source profile 15A.

An example of the reference chromatic colors is composed of six kinds of reference chromatic colors and six kinds of quasi-reference chromatic colors expressed in the outermost color gamut 11S2 of the source profile 15A in the CIELAB color space. The six standard chromatic colors are cyan (C), magenta (M), yellow (Y), red (R), green (G), and blue (B). The six sub-standard chromatic colors are blue cyan BC, cyan green (CG), magenta blue (MB), red magenta (RM), green yellow (GY), and yellow red (YR).

The color matching support device 10 has a reference chromatic color definition list 50a (see FIG. 7). The reference chromatic color definition list 50a defines color values in the data color space of the source profile 15A, one for each reference chromatic color 50aC. The color values of the reference chromatic colors are specified in advance on the data color space, as indicated by the reference chromatic color definition list 50a. The color matching support device 10 determines the colorimetric values of the reference chromatic colors based on the reference chromatic color definition list 50a and the source profile 15A. The colorimetric value of the reference chromatic color thus determined is the colorimetric value of the chromatic control point Pn before color adjustment.

As shown in FIG. 4, the achromatic control point Qn is a point on the lightness axis (gray axis) of the CIELAB space. The achromatic color control point Qn is used for color adjustment of the second device 21 . The achromatic control point Qn is different from the adjustment point Xn.

Examples of reference achromatic colors include black Bk, white W, and three types of gray. The LAB values of each of the five reference achromatic colors are white W (= g100) (100, 0, 0), gray g50 (50, 0, 0), and gray g75 (75 ,0,0) and (90,0,0) which is the gray g90. The LAB value of black Bk (g0) is not necessarily (0,0,0), but (Ln,0,0) with the darkest lightness Ln that the source profile 15A reproduces.

The color matching support device 10 has a reference achromatic color definition list 50b (see FIG. 9). The reference achromatic color definition list 50b defines colorimetric values on the colorimetric color space, one for each reference achromatic color 50bC. The reference achromatic colors are defined by LAB values, as shown in the reference achromatic definition list 50b. The color matching support device 10 determines the colorimetric value of the reference achromatic color based on the reference achromatic color definition list 50b and the source profile 15A. The colorimetric value of the reference achromatic color thus determined is the colorimetric value of the achromatic color control point Qn before color adjustment.

In the reference achromatic color definition list 50b, the lightness of the darkest lightness gray g0 is undetermined. The medium of the output device, which is a reflector, causes scattered reflection of illumination light on the surface of the print medium in addition to spectral reflection by the coloring material. Spectral reflection by the coloring material and scattering reflection of the illumination light do not make the darkest lightness reproducible on the print medium 0, so the lightness at the darkest lightness gray g0 is undetermined.

The lightness of gray g0 corresponding to black Bk reproduced as the darkest lightness is obtained through a search by the color matching support device 10 using A2B of the source profile 15A. That is, the lightness of gray g0 with the lowest lightness is determined after the source profile 15A is determined in the color matching support device 10. FIG.

Note that the color matching support device 10 sets the color value of the data color space corresponding to the darkest lightness gray g0 to the maximum color value on the data color space defined by the standard of the source profile 15A or the printing standard. may be determined. For example, the color matching support device 10 converts the maximum color value in the data color space defined by the standard of the source profile 15A or the printing standard into a LAB value using A2B of the source profile 15A, and converts the converted LAB value may be obtained as the lightness at the darkest lightness gray g0.

[Image data 51]
The color matching support device 10 generates image data 51 in order to output color patches 53 by an output device, which is the first device 52 . The data color space of image data 51 is the data color space of source profile 15A.

The color values forming the image data 51 generated by the color matching support device 10 include the color values of the reference chromatic colors in the reference chromatic color definition list 50a.
The color values constituting the image data 51 generated by the color matching support device 10 are the data of the source profile 15A obtained by converting the LAB values from gray g50 to gray g100 in the reference achromatic color definition list 50b by B2A of the source profile 15A. Contains color values in a color space. Alternatively, the color values that make up the image data 51 are obtained by searching A2B of the source profile 15A, and the darkest lightness reproduced by the source profile 15A is set to the lightness of gray g0 in the reference achromatic color definition list 50b. value. At this time, the color values constituting the image data 51 include the color values in the data color space of the source profile 15A, which are obtained by converting the LAB values of gray g0 obtained by the search by B2A of the source profile 15A.

The color values that make up the image data 51 are reproduced by the first device 52 in the colors of the color patches 53 . The colorimetric values of the reference chromatic colors that the first device 52 reproduces from the image data 51 have colorimetric values defined by the image data 51 and the source profile 15A.

The first device 52, the output device, uses A2B of the source profile 15A and B2A of the destination profile of the first device 52 to transform the color values of the image data 51 into color values of the data color space of the output device. . The output device, which is the first device 52, outputs after performing such color matching processing.

[Color matching support device 10]
Returning to FIG. 1 , the color matching support device 10 includes a matching control section 11 , a chromatic color adjustment section 12 , an achromatic color adjustment section 13 , a profile rewriting section 14 and a storage section 15 . The matching control section 11, the chromatic color adjustment section 12, the achromatic color adjustment section 13, and the profile rewriting section 14 constitute a color adjustment section 10T.

The color matching support device 10 includes devices that perform various processes using software. The color matching support device 10 may include dedicated hardware such as an Application Specific Integrated Circuit (ASIC) that performs at least part of various types of processing.

The color matching support device 10 is also configured as a circuit including one or more dedicated hardware circuits such as ASIC, one or more processors that operate according to computer programs, or a combination thereof. An example in which the color matching support device 10 stores the color matching support program 15C in a readable medium, reads out and executes the color matching support program 15C stored in the readable medium, and performs various processes will be described below.

The matching control unit 11 reads the source profile 15A from the second device 21. FIG. The matching control unit 11 reads the pre-rewriting display profile 15B from the second device 21 . The matching control unit 11 rewrites B2A of the read display profile 15B to B2A after color adjustment, and provides the rewritten display profile 15B to the second device 21 .

Storage unit 15 stores source profile 15A, display profile 15B, color matching support program 15C, reference color definition list 50, and adjustment amount data 15D.

[Processing A to C: Color Matching Support Processing]
The matching control unit 11 reads the color matching support program 15C and executes the following [processing A] [processing B] [processing C] by executing the color matching support program 15C (see FIG. 5).
[Process A] Initialization of adjustment amount data 15D (step S1)
[Process B] Change of adjustment amount (step S2)
[Processing C] Rewriting Profile (Step S4)

The matching control unit 11 includes the following [processing 1] in [processing B]. Further, the matching control unit 11 includes the following [processing 2] [processing 3] [processing 4] [processing 5] in [processing C].
[Processing 1] Setting adjustment amounts at control points Pn and Qn [Processing 2] Selecting adjustment point X0 (Steps S12 and S13)
[Process 3] Calculation of Chromatic Color Adjustment Amount (Steps S21 to S24)
[Process 4] Calculation of Achromatic Color Adjustment Amount (Steps S31 to S33)
[Process 5] Rewriting color values (steps S51 to S53)

The color matching support program 15C is a software module. The software module uses source profile 15A and display profile 15B to perform color space conversion via PCS.

The color matching support program 15C has an operating system color management function and an application-specific color management function. The color matching support program 15C manages the source profile 15A and the display profile 15B.

As shown in FIG. 5, the matching control unit 11 executes [Process A] initialization of the adjustment amount data 15D. [Processing A] The matching control unit 11 initializes the adjustment amount data 15D by using the reference chromatic color definition list 50a and the reference achromatic color definition list 50b to obtain the LCH value at the chromatic color control point Pn and the achromatic color control. Get the LAB value at point Qn. The matching control unit 11 also initializes the adjustment amount at the chromatic control point Pn to 0, and initializes the adjustment amount at the achromatic control point Qn to 0 (step S1). Also, the matching control unit 11 generates image data 51 . The matching control unit 11 outputs the color patch 53 from the image data 51 by the first device 52 and provides it to the user 55 .

Next, after executing [Process A], the matching control unit 11 executes [Process B] to change the adjustment amount. The matching control unit 11 acquires a new adjustment amount for the chromatic color control point Pn and acquires a new adjustment amount for the achromatic control point Qn as [Process B] changing the adjustment amount. The matching control unit 11 updates the adjustment amount data 15D according to the acquired adjustment amount (step S2).

Next, after executing [Processing B], the matching control unit 11 executes [Processing C] rewriting of the profile (Steps S3 and S4). Note that the matching control unit 11 may perform the following processes from [Processing B] Changing the adjustment amount to [Processing C] Rewriting the profile.

That is, the matching control unit 11 repeats the change related to the adjustment amount of the chromatic color control point Pn for any chromatic color control point Pn, and then executes [Processing C] rewriting the profile to support color matching. You can end the action.

Alternatively, the matching control unit 11 repeats the change related to the adjustment amount of the achromatic control point Qn for any achromatic control point Qn, and then executes [Processing C] rewriting the profile to support color matching. You can end the action.

Further, the matching control unit 11 repeats the change related to the adjustment amount of the chromatic color control point Pn for any chromatic color control point Pn, then executes [Processing C] rewriting the profile, and again [Processing B ] You may return to change the adjustment amount.

In addition, the matching control unit 11 repeats the change related to the adjustment amount of the achromatic control point Qn for any achromatic control point Qn, and then executes [Processing C] rewriting the profile, and [Processing B] again. ] You may return to change the adjustment amount.

Further, the matching control unit 11 executes [Processing C] rewriting the profile each time the adjustment amount of either one of the chromatic color control point Pn and the achromatic control point Qn is changed once, and again [Processing B] You may return to changing the adjustment amount.

The matching control unit 11 executes [processing B] changing the adjustment amount and [processing C] rewriting the profile, thereby changing the color reproduction described by B2A of the display profile 15B. That is, the matching control unit 11 changes the correspondence relationship between the color values of the data color space of the second device 21 and the colorimetric values of the CIELAB color space in the CLUT in B2A of the display profile 15B.

As a result, the matching control unit 11 selects colors reproduced by the first device 52 from the color values in the data color space of the source profile 15A and colors reproduced by the second device 21 from the color values in the data color space of the source profile 15A. bring closer. Then, the color matching support device 10 adds colors reproduced by the first device 52 from the color values in the data color space of the source profile 15A to colors reproduced by the second device 21 from the color values in the data color space of the source profile 15A. match.

[Processing 2 to 5: Rewriting profile]
As shown in FIG. 6, the matching control unit 11 selects one adjustment point X0 from among a plurality of adjustment points Xn (steps S12 and S13). .

Next, the matching control unit 11 causes the chromatic color adjustment unit 12 to execute [Process 3] calculation of the chromatic color adjustment amount as the color adjustment of the adjustment point X0 using the chromatic color control point Pn (steps S21 to S24). ). Further, the matching control unit 11 causes the achromatic color adjustment unit 13 to execute [Process 4] calculation of the achromatic color adjustment amount as the color adjustment of the adjustment point X0 using the achromatic control point Qn (steps S31 to S33). .

Next, the matching control unit 11 uses the results of [processing 2] to [processing 4] to rewrite the color value 15BCT of the RGB color space saved at the memory address of the adjustment point X0 in B2A of the display profile 15B. (Steps S51 to S53). The matching control unit 11 executes [Process 2] to [Process 5] for all adjustment points Xn (step S61).

The configuration for executing [Processing A], [Processing B], and [Processing C], and the details of [Processing A], [Processing B], and [Processing C] will be described below.
[Processing A: Initialization of adjustment amount data 15D]
As shown in FIG. 8, the storage unit 15 stores chromatic color adjustment amount data 15D1 that constitutes the adjustment amount data 15D. The chromatic color adjustment amount data 15D1 associates one reference chromatic color LCH value 1510 and one chromatic color adjustment amount 151T with each reference chromatic color identifier 151C for each chromatic color control point Pn. .

The reference chromatic color identifier 151C is identification information for identifying the reference chromatic color associated with the reference chromatic color identifier 151C inside the color matching support device 10. FIG.
The reference chromatic LCH value 1510 indicates the lightness L, saturation C, and hue angle H of the reference chromatic color associated with the reference chromatic LCH value 1510 . The reference chromatic color LCH value 1510 indicates the LCH value of the chromatic color control point Pn before color adjustment for the reference chromatic color associated with the reference chromatic color LCH value 1510 . The saturation C corresponds to the maximum saturation at the hue angle H of the chromatic color control point Pn.

The chromatic color adjustment amount 151T indicates the lightness adjustment amount ΔL, saturation adjustment amount ΔC, and hue angle adjustment amount ΔH of the reference chromatic color associated with the chromatic color adjustment amount 151T. The lightness adjustment amount ΔL, the saturation adjustment amount ΔC, and the hue angle adjustment amount ΔH are set based on the instruction of the user 55 among the setting of the LCH value at the chromatic color control point Pn after the instruction of the chromatic color adjustment amount. .

As shown in FIG. 10, the storage unit 15 stores achromatic color adjustment amount data 15D2 that constitute adjustment amount data 15D. The achromatic color adjustment amount data 15D2 associates one reference achromatic color identifier 152C with one achromatic color control point Qn with one reference achromatic LAB value 1520 and one achromatic color adjustment amount 152T. .

The reference achromatic color identifier 152C is identification information for identifying the reference achromatic color associated with the reference achromatic color identifier 152C inside the color matching support device 10 .
The reference achromatic LAB value 1520 indicates the LAB value of the reference achromatic color associated with the reference achromatic LAB value 1520 . The reference achromatic color LAB value 1520 indicates the LAB value of the achromatic color control point Qn before the adjustment amount instruction for the reference achromatic color associated with the reference achromatic color LAB value 1520 .

The achromatic color adjustment amount 152T indicates the reference achromatic color lightness adjustment amount ΔL, adjustment amount Δa, and adjustment amount Δb associated with the achromatic color adjustment amount 152T. The lightness adjustment amount ΔL, the adjustment amount Δa, and the adjustment amount Δb are set based on the instruction of the user 55 during the calculation of the LAB value at the achromatic control point Qn after the achromatic adjustment amount is indicated.

The matching control unit 11 initializes the chromatic color adjustment amount data 15D1 as [Processing A]. To initialize the chromatic color adjustment amount data 15D1, the matching control unit 11 first reflects 0 as an initial value in the chromatic color adjustment amount 151T of the chromatic color adjustment amount data 15D1. Next, the matching control unit 11 uses A2B of the source profile 15A to obtain the LAB values of all the chromatic color control points Pn before the adjustment amount instruction from the reference chromatic color definition list 50a.

The matching control unit 11 converts the acquired LAB value into an LCH value and reflects it in the reference chromatic color LCH value 1510 of the chromatic color adjustment amount data 15D1.
Each chromatic color control point Pn before the instruction of the adjustment amount is a chromatic color control point Pn used for rewriting the display profile 15B, that is, [process 3] chromatic color control point Pn used for chromatic color adjustment.

Note that the matching control unit 11 converts the LAB value at the chromatic color control point Pn before the adjustment amount instruction to the LCH value at the chromatic color control point Pn before the adjustment amount instruction in [Processing A] using the following formula (1). Convert to The following formula (1) shows the relationship between the LAB value and the LCH value. Thereby, the matching control unit 11 calculates the LCH values at all the chromatic color control points Pn before the instruction of the adjustment amount.

また、マッチング制御部１１は、［処理Ａ］として、無彩色調整量データ１５Ｄ２を初期化する。まず、マッチング制御部１１は、無彩色調整量データ１５Ｄ２の無彩色調整量１５２Ｔに初期値として０を反映する。

In addition, the matching control unit 11 initializes the achromatic color adjustment amount data 15D2 as [processing A]. First, the matching control unit 11 reflects 0 as an initial value in the achromatic color adjustment amount 152T of the achromatic color adjustment amount data 15D2.

Next, the matching control unit 11 acquires the LAB values of all the achromatic control points Qn excluding the gray g0 before the adjustment amount instruction from the reference achromatic color definition list 50b, and obtains the reference achromatic color LAB values of the achromatic color adjustment amount data 15D2. Reflected in the value 1520.

Subsequently, using A2B of the source profile 15A, the matching control unit 11 obtains the darkest lightness of color reproduction represented by the source profile 15A as the LAB value of the achromatic control point Qn before the adjustment amount instruction, and performs achromatic color adjustment. It is reflected in the reference achromatic LAB value 1520 of gray g0 in the quantity data 15D2.

Each achromatic color control point Qn before the instruction of the adjustment amount is the achromatic color control point Qn used for rewriting the display profile 15B, that is, [Process 4] achromatic color control point Qn used for achromatic color adjustment.

Here, the color matching support device 10 also causes the matching control unit 11 to generate image data 51 from the reference chromatic color definition list 50a and the reference achromatic color definition list 50b in which the reference achromatic gray g0 is determined. The matching control unit 11 uses the color values of the reference chromatic color definition list 50 a as the color values of the image data 51 . Using B2A of the source profile 15A from the reference achromatic color definition list 50b, the matching control unit 11 converts the LAB values of the reference achromatic color definition list 50b into the color values of the data color space of the source profile 15A, be a color value. The color matching support device 10 sends image data 51 to the first device 52 to output color patches 53 . In this way, the control points Pn, Qn and the color patch 53 of the adjustment amount data 15D are derived from the same source profile 15A and the same reference color definition list 50, and correspond to those to be reproduced in the same color.

[Processing B: Change of adjustment amount]
The matching control unit 11 acquires the chromatic color adjustment amount for each chromatic color control point Pn as the adjustment amount for each chromatic color control point Pn. The matching control unit 11 acquires the achromatic color adjustment amount for the achromatic color control point Qn as the adjustment amount for each achromatic color control point Qn. The matching control unit 11 sets the chromatic color adjustment amount for the chromatic color control point Pn and the achromatic color adjustment amount for the achromatic color control point Qn based on the instruction of the user 55 .

An example of adjustment amount setting performed by the matching control unit 11 will be described below.
The matching control unit 11 executes [Processing 1-2] to [Processing 1-4] in order of the processing number to set the adjustment amount at the chromatic color control point Pn.
[Process 1-2] Calculation of LCH value at chromatic color control point Pn after instruction of adjustment amount [Process 1-3] Update of chromatic color adjustment amount data 15D1 [Process 1-4] Search for color value in RGB color space

The matching control unit 11 executes [Processing 1-6] to [Processing 1-8] in the order of the processing numbers to set the adjustment amount at the achromatic control point Qn.
[Process 1-6] Calculation of LAB value at achromatic color control point Qn after instruction of adjustment amount [Process 1-7] Update of achromatic color adjustment amount data 15D2 [Process 1-8] Search for color value in RGB color space

The user 55 visually compares the LCH value on the operation screen 21A, the color of the chromatic control point Pn displayed on the operation screen 21A, and the color of the color patch 53, and instructs the amount of adjustment for the color of the chromatic control point Pn. do. Next, as [process 1-2], the matching control unit 11 calculates the LCH value at the chromatic color control point Pn after the adjustment amount instruction. The LCH value at the chromatic color control point Pn after the adjustment amount instruction is calculated based on the adjustment amount instruction by the user 55 .

The LCH value at the chromatic color control point Pn after the adjustment amount instruction is determined from the LCH value at the chromatic control point Pn before the adjustment amount instruction based on the adjustment amount instruction for the chromatic control point Pn by the user 55. .

[Process 1-2] The matching control unit 11 converts the LCH value at the chromatic color control point Pn after the adjustment amount instruction to the LAB value at the chromatic control point Pn after the adjustment amount instruction, using the above equation (1). do. The LAB value at the chromatic color control point Pn after the instruction of the adjustment amount is used for [process 1-4] color value search in the RGB color space. The matching control unit 11 uses A2B of the display profile 15B to search for the optimum solution for the RGB values corresponding to the LAB values of the chromatic color control point Pn after [Process 1-4] adjustment amount instruction. Thereby, the matching control unit 11 calculates the RGB values at the chromatic color control point Pn after the instruction of the adjustment amount.

[Processing B: Operation screen 21A]
As shown in FIG. 11, the color matching support device 10 causes the second device 21 to display an operation screen 21A in setting the adjustment amount at the chromatic color control point Pn. The operation screen 21A includes an adjustment amount instruction pre-color display section 22, an adjustment amount instruction post-color display section 23, an adjustment amount instruction section 24, an H value display section 25A, a CL value display section 25B, and a rewrite instruction section 25P.

Note that the operation screen 21A shown in FIG. 11 is generated by the matching control unit 11 based on the chromatic color adjustment amount data 15D1 at the start of changing the chromatic color adjustment amount. The operation screen 21A shown in FIG. 12 is generated by the matching control unit 11 based on the chromatic color adjustment amount data 15D1 after updating the adjustment amount at the chromatic color control point Pn.

The pre-adjustment instruction color display section 22 displays the color at the chromatic control point Pn before the adjustment amount instruction. The color at the chromatic color control point Pn before the adjustment amount instruction is searched as the optimum solution from the LAB values at the chromatic color control point Pn before the adjustment amount instruction in [Processing 1-4] Searching for color values in the RGB color space. , is displayed based on color values in the RGB color space.

The pre-adjustment amount instruction color display section 22 displays the color of the chromatic color control point Pn for which the adjustment amount is instructed by the adjustment amount instruction section 24 before the adjustment amount instruction. The pre-adjustment instruction color display unit 22 compares the color displayed on the adjustment amount instruction pre-color display unit 22 with the color of the color patch 53 reproduced by the first device 52 to determine whether or not they match. support visual judgment of

The post-adjustment amount indication color display section 23 displays the color at the chromatic color control point Pn after the adjustment amount indication. The color at the chromatic color control point Pn after the adjustment amount instruction is searched as the optimum solution from the LAB values at the chromatic color control point Pn after the adjustment amount instruction in [Processing 1-4] Searching for color values in the RGB color space. , is displayed based on color values in the RGB color space.

The post-adjustment-amount-specified color display section 23 displays the color of the chromatic control point Pn for which the adjustment amount has been specified by the adjustment amount specifying section 24, after the adjustment amount has been specified. The post-adjustment-instruction color display unit 23 compares the color displayed in the post-adjustment-instruction color display unit 23 with the color of the color patch 53 reproduced by the first device 52 to determine whether or not they match. support the visual judgment of

Further, the post-adjustment-instruction color display section 23 compares the color displayed in the pre-adjustment-instruction color display section 22 with the color displayed in the post-adjustment-instruction color display section 23, and displays the difference between them. Therefore, it is possible to visually determine whether or not the chromatic color adjustment amount specified by the user 55 follows the change intended by the user 55 .

The adjustment amount instruction unit 24 is a human interface for inputting the chromatic color adjustment amount. The adjustment amount instruction unit 24 is configured so that the user 55 can separately input the lightness adjustment amount ΔL, the saturation adjustment amount ΔC, and the hue angle adjustment amount ΔH for one chromatic color control point Pn.

The adjustment amount instruction unit 24 inputs the adjustment amount of the chromatic color control point Pn as the chromatic color adjustment amount instructed by the user 55 . The lightness adjustment amount ΔL, the saturation adjustment amount ΔC, and the hue angle adjustment amount ΔH can be input by the adjustment amount instruction section 24, as well as by the H value display section 25A and the CL value display section 25B. It may be performed by an icon drag operation, which is a moving operation of the coloring control point Pn.

The H value display section 25A displays chromatic color control points Pn for all reference chromatic colors on circular polar coordinates with a constant radius. The H value display section 25A displays the color at the chromatic control point Pn in the circle icon indicating the chromatic control point Pn. The H value display section 25A displays the hue angles at all the chromatic color control points Pn so that the positional relationship between the hue angle H at one chromatic color control point Pn and the hue angle H at another chromatic color control point Pn can be visually observed. Display H.

The hue angle H of the chromatic color control point Pn displayed by the H value display unit 25A is determined by the matching control unit 11 referring to the reference chromatic color LCH value 1510 of the chromatic color adjustment amount data 15D1 before specifying the chromatic color adjustment amount. It is displayed based on the hue angle H at the chromatic color control point Pn before the instruction of the adjustment amount. The color inside the circle icon of the chromatic color control point Pn displayed by the H value display section 25A is the same as the pre-instruction color display section 22 for the chromatic color adjustment amount before the instruction for the chromatic adjustment amount. This is the color at the chromatic color control point Pn.

That is, the color in the circular icon of the chromatic color control point Pn displayed by the H value display unit 25A before the instruction is determined by the matching control unit 11 referring to the reference chromatic color LCH value 1510 and using the above equation (1). Obtained by converting the reference chromatic LCH values 1510 to LAB values. Then, the color in the circular icon of the chromatic color control point Pn displayed by the H value display section 25A before the instruction is obtained by converting the above-mentioned LAB value is displayed based on the color values in the RGB color space searched as the optimum solution from .

The hue angle H of the chromatic color control point Pn displayed by the H value display section 25A is displayed based on the hue angle H obtained by [Processing 1-2] LCH value calculation after the chromatic color adjustment amount is indicated. The color inside the circle icon of the chromatic color control point Pn displayed by the H value display section 25A is the same as the post-adjustment amount indication color display section 23 after the chromatic color adjustment amount is indicated. is the color at the point Pn.

That is, the color in the circle icon of the chromatic color control point Pn displayed by the H value display unit 25A after the adjustment amount instruction is obtained by the matching control unit 11 [Processing 1-2] referring to the hue angle H obtained by calculating the LCH value. obtained by Then, the color in the circle icon of the chromatic color control point Pn displayed by the H value display unit 25A after the adjustment amount is instructed is the LCH The values are displayed based on the color values in the RGB color space searched as the optimum solution from the LAB values converted using the above formula (1).

Note that the H value display section 25A may determine the order based on the hue angle H for each chromatic control point Pn among all the chromatic control points Pn. The H value display section 25A may limit the adjustment amount of the chromatic color control points Pn so that the order based on the adjusted hue angle H is not changed by the instruction of the adjustment amount instruction section 24 .

The CL value display section 25B displays the chromatic color control point Pn as a circle icon on the saturation lightness coordinates. When displaying the CL value display section 25B, the matching control section 11 refers to the reference chromatic color LCH value 1510 and the chromatic color adjustment amount 151T of the chromatic color adjustment amount data 15D1. The CL value display section 25B displays the color at the chromatic control point Pn in the circle icon of the chromatic control point Pn. That is, the CL value display section 25B displays the chromatic color control point Pn in the saturation lightness plane 11S1 including the chromatic color control point Pn.

The saturation C and lightness L of the chromatic color control point Pn displayed by the CL value display section 25B are determined by the matching control section 11 from the reference chromatic color LCH value 1510 of the chromatic color adjustment amount data 15D1 before the instruction of the chromatic color adjustment amount. , and is displayed based on the saturation C and lightness L at the chromatic color control point Pn before the adjustment amount instruction. The color inside the circle icon of the chromatic color control point Pn displayed by the CL value display section 25B is the same as the pre-instruction color display section 22 for the chromatic color adjustment before the chromatic adjustment amount is instructed. This is the color at the chromatic color control point Pn.

After instructing the chromatic color adjustment amount, the CL value display section 25B uses the saturation C at the chromatic color control point Pn before the chromatic color adjustment amount instruction as a reference, and the chromatic color control point Pn indicated by the adjustment amount instruction section 24 is displayed. Based on the saturation C of , the chromatic color control point Pn is displayed as a circle icon on the saturation lightness coordinates.

After instructing the chromatic color adjustment amount, the CL value display section 25B uses the lightness L at the chromatic color control point Pn before the chromatic color adjustment amount instruction as a reference, and displays the value of the chromatic color control point Pn instructed by the adjustment amount instruction section 24. Based on the lightness L, the chromatic color control point Pn is displayed as a circle icon on the saturation lightness coordinates.

That is, the lightness L and saturation C of the chromatic color control point Pn displayed by the CL value display section 25B are changed after the chromatic color adjustment amount is indicated by [processing 1-2] the chromatic color control point Pn after the adjustment amount is indicated. is displayed based on the new lightness L and chroma C calculated as the LCH value in . The color inside the circle icon of the chromatic color control point Pn displayed by the CL value display section 25B is the same as the post-adjustment amount instruction color display section 23 after the chromatic color adjustment amount is indicated. Display the color at the point Pn. The color in the circle icon of the chromatic color control point Pn displayed by the CL value display unit 25B is determined by the above formula (1 ) is displayed based on the color values of the RGB color space searched as the optimum solution from the LAB values converted using .

The rewrite instruction section 25P is a human interface for rewriting B2A of the display profile 15B. The rewriting instruction section 25P instructs the color matching support device 10 to rewrite B2A by pressing the rewriting instruction section 25P.

[Processing 1-3] To update the chromatic color adjustment amount data, the matching control unit 11 reflects the adjustment amount instructed by the user 55 through the operation screen 21A to the chromatic color adjustment amount 151T of the chromatic color control point Pn. and thereby update the chromatic color adjustment amount data 15D1. That is, the matching control unit 11 causes the user 55 to interactively instruct the new LCH value at the chromatic color control point Pn as follows through the operation of the operation screen 21A by the user 55 .

First, the matching control unit 11 causes the operation screen 21A to display the color corresponding to the chromatic control point Pn before the adjustment amount instruction as the LCH value of the chromatic control point Pn before the adjustment amount instruction.
Next, the user 55 visually compares the color at the chromatic color control point Pn displayed on the operation screen 21</b>A before the adjustment amount instruction and the color of the color patch 53 reproduced by the first device 52 . The user 55 visually determines whether or not the color at the chromatic color control point Pn displayed on the operation screen 21A before the instruction of the adjustment amount matches the color of the color patch 53 reproduced by the first device 52 .

Next, if the color of the color patch 53 and the color at the chromatic control point Pn before the adjustment amount instruction appear different, the user 55 operates the operation screen 21A to select the chromatic control point before the adjustment amount instruction. For the color at Pn, indicates the amount of adjustment of the LCH value.

Then, the matching control unit 11 receives an adjustment amount input by the user 55, and adjusts the chromatic color adjustment amount data 15D1 so that each value stored in the chromatic color adjustment amount data 15D1 corresponds to the instructed adjustment amount. Update. Accordingly, the matching control unit 11 updates the chromatic color adjustment amount data 15D1 of the color matching support device 10 to reflect the latest chromatic color adjustment amount instruction every time the chromatic color adjustment amount is instructed.

As [Process 1-4], the matching control unit 11 uses the updated chromatic color adjustment amount data 15D1 to search for the color value in the RGB color space at the chromatic color control point Pn after the adjustment amount instruction. That is, the matching control unit 11 applies the new LCH value set through the instruction of the user 55 to the above equation (1), and converts the new LAB value, which is the converted value of the new LCH value, into Calculate the LAB value at the chromatic color control point Pn.

The matching control unit 11 searches for an optimal solution of color values in the RGB color space such that new LAB values at the chromatic color control point Pn after the instruction of the adjustment amount can be obtained from A2B of the display profile 15B. In other words, the matching control unit 11 searches for the A2B input values (RGB) such that the LAB value can be obtained from the A2B output values of the display profile 15B as the optimum solution. The matching control unit 11 performs a search such that the A2B output value used to search for the optimum color value solution in the RGB color space becomes a new LAB value at the chromatic color control point Pn after the adjustment amount instruction.

In this way, the matching control unit 11 is given new LAB values at the chromatic color control points Pn after the adjustment amount instruction. Then, the matching control unit 11 obtains the optimum solution of the color values in the RGB color space for obtaining new LAB values at the chromatic color control point Pn after the instruction of the adjustment amount, based on A2B forming the display profile 15B. An example of a method for obtaining an optimal solution of color values in such an RGB color space is a gradient method such as the conjugate gradient method, the Newton method, and the quasi-Newton method, and other methods such as the Nelder-Mead method and the pseudo-annealing method. .

The user 55 compares the LAB value on the operation screen 21B, the color of the achromatic control point Qn displayed on the operation screen 21B, and the color of the color patch 53, and instructs the amount of adjustment for the color of the achromatic control point Qn. . Next, as [process 1-6], the matching control unit 11 calculates the LAB value at the achromatic color control point Qn after the adjustment amount instruction. The LAB value at the achromatic color control point Qn after the adjustment amount instruction is calculated based on the adjustment amount instruction by the user 55 .

The LAB value at the achromatic color control point Qn after the adjustment amount instruction is determined from the LAB value at the achromatic color control point Qn before the adjustment amount instruction, based on the instruction of the adjustment amount to the achromatic color control point Qn by the user 55. . The LAB value at the achromatic color control point Qn after the instruction of the adjustment amount is used for [Processing 1-8] Color value search in the RGB color space.

[Processing B: Operation screen 21B]
As shown in FIG. 13, the matching control unit 11 causes the second device 21 to display the operation screen 21B in setting the adjustment amount at the achromatic control point Qn. The operation screen 21B includes an AB chromaticity display section 26, an adjustment amount instruction section 27, an AL value display section 28A, a BL value display section 28B, a brightness display section 28C, and a rewrite instruction section 28P.

Note that the operation screen 21B shown in FIG. 13 is generated by the matching control unit 11 based on the achromatic color adjustment amount data 15D2 at the start of changing the achromatic color adjustment amount. The operation screen 21B shown in FIG. 14 is generated by the matching control unit 11 based on the achromatic color adjustment amount data 15D2 after updating the adjustment amount at the achromatic color control point Qn.

The AB chromaticity display unit 26 displays the achromatic color control point Qn indicated by the adjustment amount indicating unit 27 as a circle icon on AB orthogonal coordinates. The value of the chromaticity component a and the value of the chromaticity component b at the achromatic color control point Qn displayed by the AB chromaticity display unit 26 are obtained by the matching control unit 11 using the reference achromatic color LAB value 1520 of the achromatic color adjustment amount data 15D2. This is referred to and reproduced based on the LAB value at the achromatic color control point Qn before the instruction of the adjustment amount.

The AB chromaticity display unit 26 displays the color at the achromatic control point Qn before the instruction of the adjustment amount in the circle icon of the achromatic control point Qn. The color in the circle icon of the achromatic control point Qn displayed by the AB chromaticity display unit 26 is the color of the achromatic control point Qn before the instruction of the adjustment amount in [Processing 1-8] search for color values in the RGB color space. It is displayed based on the color values in the RGB color space searched as the optimum solution from the LAB values.

The AB chromaticity display section 26 displays the color after the adjustment amount instruction of the achromatic color control point Qn instructed by the adjustment amount instruction section 27 on the background of the AB chromaticity coordinates. The color of the achromatic control point Qn after the instruction of the adjustment amount is searched as the optimum solution from the LAB values of the achromatic control point Qn after the instruction of the adjustment amount in [Processing 1-8] Searching for color values in the RGB color space. , is displayed based on color values in the RGB color space.

The AB chromaticity display unit 26 compares the color displayed on the AB chromaticity display unit 26 with the color of the color patch 53 reproduced by the first device 52, and visually judges whether or not they match. Assist. The AB chromaticity display unit 26 compares the color displayed in the background of the AB chromaticity coordinates with the color displayed in the circle icon in the AB chromaticity coordinates. This assists visual judgment as to whether or not the instructed achromatic color adjustment amount follows the change intended by the user 55 .

The adjustment amount instruction unit 27 is a human interface for inputting an achromatic color adjustment amount. The adjustment amount instruction unit 27 is configured so that the user 55 can separately input the lightness adjustment amount ΔL, the chromaticity adjustment amount Δa, and the chromaticity adjustment amount Δb for one achromatic control point Qn.

The adjustment amount instructing unit 27 inputs the adjustment amount of the achromatic color control point Qn as the achromatic color adjustment amount instructed by the user 55 . The lightness adjustment amount ΔL, the chromaticity adjustment amount Δa, and the chromaticity adjustment amount Δb can be input by the adjustment amount indicator 27, the AB chromaticity display section 26, the AL value display section 28A, and the BL value display section 28A. It may be performed by an icon drag operation, which is a moving operation of the achromatic color control point Qn in the value display portion 28B and the brightness display portion 28C.

The AL value display section 28A displays all the achromatic color control points Qn as circular icons on the orthogonal coordinates of the lightness L and the chromaticity component a. The AL value display section 28A displays the color of the achromatic control point Qn after the instruction of the adjustment amount in the circle icon. The color of the achromatic control point Qn after the instruction of the adjustment amount is searched as the optimum solution from the LAB values of the achromatic control point Qn after the instruction of the adjustment amount in [Processing 1-8] Searching for color values in the RGB color space. , is displayed based on color values in the RGB color space.

The AL value display section 28A displays the achromatic control point Qn indicated by the adjustment amount indicating section 27 as a large circle icon, and displays the achromatic control point Qn not indicated as a small circle icon. The AL value display unit 28A allows the user 55 to compare the color of the large circle icon and the color of the small circle icon displayed on the orthogonal coordinates of the lightness L and the chromaticity component a. The AL value display unit 28A visually determines whether or not the achromatic color adjustment amount instructed by the user 55 follows the change intended by the user 55, based on the difference between the color of the large circle icon and the color of the small circle icon. Assist.

The BL value display unit 28B displays all the achromatic color control points Qn as circle icons on the orthogonal coordinates of the lightness L and the chromaticity component b. The BL value display section 28B displays the color of the achromatic control point Qn after the instruction of the adjustment amount in the circle icon. The color of the achromatic control point Qn after the instruction of the adjustment amount is searched as the optimum solution from the LAB values of the achromatic control point Qn after the instruction of the adjustment amount in [Processing 1-8] Searching for color values in the RGB color space. , is displayed based on color values in the RGB color space.

The BL value display section 28B displays the achromatic color control points Qn indicated by the adjustment amount indicating section 27 as large circle icons, and displays the non-indicated achromatic control points Qn as small circle icons. The BL value display unit 28B allows the user 55 to compare the color of the large circle icon and the color of the small circle icon displayed on the orthogonal coordinates of the lightness L and the chromaticity component b. The BL value display unit 28B visually determines whether or not the achromatic color adjustment amount specified by the user 55 follows the change intended by the user 55, based on the difference between the color of the large circle icon and the color of the small circle icon. Assist.

The lightness display section 28C displays all the achromatic control points Qn as circular icons on orthogonal coordinates. The horizontal axis of the orthogonal coordinates displayed by the brightness display unit 28C is the brightness L before the adjustment amount is indicated, and the vertical axis of the orthogonal coordinates is the brightness L after the adjustment amount is indicated. The brightness display section 28C displays the color of the achromatic control point Qn after the instruction of the adjustment amount in the circle icon.

The brightness display section 28C displays the achromatic control points Qn indicated by the adjustment amount indicating section 27 as large circle icons, and displays the non-instructed achromatic control points Qn as small circle icons. The color of the achromatic control point Qn after the instruction of the adjustment amount is searched as the optimum solution from the LAB values of the achromatic control point Qn after the color adjustment in [Processing 1-8] Searching for color values in the RGB color space. Displayed based on color values in the RGB color space.

The brightness display unit 28C allows the user 55 to compare the color of the large circle icon and the color of the small circle icon displayed on the orthogonal coordinates of the brightness L before the adjustment amount instruction and the brightness L after the adjustment amount instruction. The brightness display unit 28C supports visual judgment as to whether or not the achromatic color adjustment amount specified by the user 55 follows the change intended by the user 55, based on the difference between the color of the large circle icon and the color of the small circle icon. do.

The lightness display section 28C may set the order based on the lightness L to each achromatic control point Qn among all the achromatic control points Qn. The lightness display section 28C may limit the adjustment amount of the achromatic color control points Qn so that the order based on the lightness L after the adjustment amount instruction is not changed by the instruction of the adjustment amount instruction section 27 .

The rewrite instruction section 28P is a human interface for rewriting B2A of the display profile 15B. The rewriting instruction section 28P instructs the color matching support device 10 to rewrite B2A by pressing the rewriting instruction section 28P.

[Process 1-7] To update the achromatic color adjustment amount data, the matching control unit 11 reflects the adjustment amount instructed by the user 55 through the operation screen 21B to the achromatic color adjustment amount 152T of the achromatic control point Qn. and thereby update the achromatic color adjustment amount data 15D2. That is, the matching control unit 11 causes the user 55 to interactively instruct the new LAB value at the achromatic control point Qn as follows through the operation of the operation screen 21B by the user 55 .

First, the matching control unit 11 causes the operation screen 21B to display the color corresponding to the achromatic control point Qn before the adjustment amount instruction as the LAB value of the achromatic control point Qn before the adjustment amount instruction.
Next, the user 55 visually compares the color at the achromatic color control point Qn before instructing the adjustment amount and the color of the color patch 53 reproduced by the first device 52 . The user 55 visually determines whether or not the color at the achromatic control point Qn before the adjustment amount instruction matches the color of the color patch 53 reproduced by the first device 52 .

Next, if the color of the color patch 53 and the color at the achromatic control point Qn before the adjustment amount instruction appear different, the user 55 operates the operation screen 21B to select the achromatic color control point before the adjustment amount instruction. For the color in Qn, indicate the amount of LAB value adjustment.

Then, the matching control unit 11 receives an adjustment amount input by the user 55, and adjusts the achromatic color adjustment amount data 15D2 so that each value stored in the achromatic color adjustment amount data 15D2 corresponds to the instructed adjustment amount. Update. As a result, the matching control unit 11 changes the achromatic color adjustment of the color matching support device 10 to a state in which the latest achromatic color adjustment amount is reflected each time [process 1-6] the achromatic color adjustment amount is newly instructed. Update quantity data 15D2.

As [Processing 1-8], the matching control unit 11 uses the updated achromatic color adjustment amount data 15D2 to search for the color value in the RGB color space at the achromatic color control point Qn after the adjustment amount instruction. That is, the matching control unit 11, like the search for the optimum solution by [process 1-4], sets a new LAB value at the achromatic color control point Qn after the instruction of the adjustment amount from A2B of the display profile 15B. , search for an optimal solution of color values in the RGB color space.

[Processing C: Rewriting profile]
The matching control unit 11 presses the rewrite instruction unit 25P on the operation screen 21A or presses the rewrite instruction unit 28P on the operation screen 21B to perform [processing C] for rewriting the profile, [processing 2] [processing 3] [processing 4]. ] Execute [Process 5].

[Process 2: Selection of adjustment point X0]
Returning to FIG. 6, upon receiving a rewrite instruction from the rewrite instruction section 25P of the operation screen 21A or the rewrite instruction section 28P of the operation screen 21B, the matching control section 11 refers to B2A of the display profile 15B before rewriting. After referring to B2A before rewriting, the matching control unit 11 performs [processing 2] selection of the adjustment point X0 for [processing 5] rewriting the color value.

That is, the matching control unit 11 selects one grid before color adjustment from the CLUT of the display profile 15B. The matching control unit 11 selects the adjustment point X0 one by one from all the adjustment points Xn, and calculates the LAB value at the selected adjustment point X0 (step S12).

Next, the matching control unit 11 calculates the LCH of the selected adjustment point X0. That is, the matching control unit 11 converts the LAB value at the adjustment point X0 before color adjustment into an LCH value using the above equation (1). The matching control unit 11 treats the LAB value at the adjustment point X0 as [L0, a0, b0] and the LCH value at the adjustment point X0 as [L0, C0, H0] (step S13).

[Process 3: Calculation of Chromatic Color Adjustment Amount]
[Process 2] After calculating the LCH value of the adjustment point X0 to select the adjustment point X0, the matching control unit 11 performs [Process 5] [Process 3] Calculates the chromatic color adjustment amount for rewriting the color value. . That is, the matching control unit 11 causes the chromatic color adjustment unit 12 to calculate the chromatic color adjustment amount for the adjustment point X0.

As the calculation of the chromatic color adjustment for the adjustment point X0, the matching control unit 11 converts the chromatic color adjustment amount T1a (see FIG. 17) of the adjustment point X0 into a chromatic color based on the adjustment amount of the chromatic color control point Pn. Let the adjustment unit 12 calculate. An example of interpolation using two chromatic color control points P1 and P2 will be described below as an example of calculation of the chromatic color adjustment amount T1a by the chromatic color adjustment unit 12. FIG.

For example, as shown in FIG. 15, the chromatic color adjustment unit 12 refers to the hue angle H0 at the selected adjustment point X0 before color adjustment. The chromatic color adjustment unit 12 selects two chromatic color control points Pn having two hue angles H1 and H2 located in the vicinity of the adjustment point X0 and sandwiching the hue angle H0 among the hue angles H of all the chromatic color control points Pn. Color control points P1 and P2 are specified (step S21).

Here, the chromatic color adjustment unit 12 treats the LCH value at the chromatic color control point P1 as [LP1, C1, H1]. The chromatic color adjustment unit 12 treats the LCH value at the chromatic color control point P2 as [LP2, C2, H2].

Next, the chromatic color adjustment unit 12 uses the following formula (2) to determine the intermediate adjustment amount T1 at the hue angle H0 of the adjustment point X0 (see FIG. 17) from the adjustment amounts of the two chromatic color control points P1 and P2. is calculated (step S22). Subsequently, the chromatic color adjustment unit 12 calculates the maximum saturation CP, which is the maximum value of the saturation C at the hue angle H0 of the adjustment point X0, using the following formula (2) (step S23). Then, the chromatic color adjustment unit 12 calculates the chromatic color adjustment amount T1a at the adjustment point X0 from the intermediate adjustment amount T1 at the hue angle H0 at the adjustment point X0 using the following formula (3) (step S24).

In other words, the chromatic color adjustment unit 12 handles the chromatic color adjustment amounts of the chromatic color control points P1 and P2 and the adjustment point X0 as a function of the hue angle H. Considering the continuity of the data color space and the PCS, the chromatic color adjustment unit 12 adjusts the saturation adjustment amount, the lightness adjustment amount, and the hue angle adjustment amount determined by the hue angle H based on the hue angle H0 of the adjustment point X0. Allocate proportionally.

式（２）において、有彩色調整部１２は、２つの有彩色制御点Ｐ１，Ｐ２の間の色相角差に対する、調整点Ｘ０と有彩色制御点Ｐ１との色相角差を、比例配分係数ｆとして扱う。

In equation (2), the chromatic color adjustment unit 12 calculates the hue angle difference between the adjustment point X0 and the chromatic color control point P1 with respect to the hue angle difference between the two chromatic color control points P1 and P2 by the proportional distribution coefficient f treated as

The chromatic color adjustment unit 12 treats the chromatic color adjustment amount of the chromatic color control point P1 as [ΔLP1, ΔCP1, ΔHP1]. The chromatic color adjustment unit 12 treats the chromatic color adjustment amount of the chromatic color control point P2 as [ΔLP2, ΔCP2, ΔHP2].

Then, the chromatic color adjustment unit 12 divides the adjustment amounts obtained by proportionally distributing the chromatic color adjustment amounts of the respective chromatic control points P1 and P2 using the proportional distribution coefficient f into the intermediate adjustment amount T0 of the adjustment point X0 [ΔLP, ΔCP, ΔHP].

Note that the chromatic color adjustment unit 12 converts the intermediate adjustment amount T0 of the adjustment point X0 to [ΔLP, ΔaP, ΔbP], which is the intermediate adjustment amount T1 of the adjustment point X0 in the LAB coordinate system, using the following formula (4). do.

ここで、［基準色定義リスト５０］および［画像データ５１］において説明したように、基準有彩色定義リスト５０ａに基づく有彩色制御点Ｐｎは、ＣＩＥＬＡＢ色空間におけるソースプロファイル１５Ａの色域の最外郭上の頂点、または稜線上の点である。２つの有彩色制御点Ｐ１，Ｐ２もまた、ソースプロファイル１５Ａの色域の最外郭上の頂点、または稜線上の点である。これらから、各有彩色制御点Ｐ１，Ｐ２の測色値（ＬＣＨ値）を比例配分係数ｆによって比例配分した測色値（ＬＣＨ値）を有する中間制御点Ｐもまた、第１装置５２の色域の最外郭上の頂点、または稜線近傍に位置すると見なされる。

Here, as described in [reference color definition list 50] and [image data 51], the chromatic color control points Pn based on the reference chromatic color definition list 50a are the outermost contours of the color gamut of the source profile 15A in the CIELAB color space. A vertex above, or a point on a ridge. The two chromatic color control points P1 and P2 are also points on the outermost vertices or edges of the color gamut of the source profile 15A. From these, the intermediate control point P having the colorimetric value (LCH value) obtained by proportionally distributing the colorimetric value (LCH value) of each of the chromatic control points P1 and P2 by the proportional distribution coefficient f is also the color of the first device 52. It is considered to be located near the vertex or edge on the outermost contour of the area.

Based on this estimation, the chromatic color adjustment unit 12 uses the above equation (2) to calculate the saturation C of the intermediate control point P as the maximum saturation CP at the hue angle H0 of X0 (step 23).
In the above equation (3), the chromatic color adjustment unit 12 treats the saturation C0 of the adjustment point X0 with respect to the maximum saturation CP, which is the saturation of the intermediate control point P, as the proportional distribution coefficient h. The chromatic color adjustment unit 12 treats the adjustment amount obtained by proportionally distributing the intermediate adjustment amount T1 of the adjustment point X0 using the proportional distribution coefficient h as the chromatic color adjustment amount T1a of the adjustment point X0. (Step S24). At this time, the chromatic color adjuster 12 may limit the value of the proportional distribution coefficient h to a value between 0 and 1. FIG. That is, in the above formula (3), when the proportional distribution coefficient h takes a value smaller than 0, the proportional distribution coefficient h=0, and when the proportional distribution coefficient h takes a value greater than 1, the proportional distribution coefficient h=1. good too.

[Processing 4: Calculation of Achromatic Color Adjustment Amount]
The matching control unit 11 performs [Process 4] Calculates an achromatic color adjustment amount for [Process 5] rewriting the color value in the same manner as [Process 3] Calculates the chromatic color adjustment amount. That is, the matching control unit 11 causes the achromatic color adjustment unit 13 to calculate the achromatic color adjustment amount for the adjustment point X0.

When calculating the achromatic color adjustment amount for the adjustment point X0, the matching control unit 11 nullifies the achromatic color adjustment amount T2a (see FIG. 17) for the adjustment point X0 based on the adjustment amount for the achromatic color control point Qn. Let the coloring adjustment unit 13 calculate. An example of interpolation using two achromatic color control points Q1 and Q2 will be described below as an example of calculation of the achromatic color adjustment amount T2a by the achromatic color adjustment unit 13. FIG.

For example, as shown in FIG. 16, the achromatic color adjustment unit 13 refers to the lightness L0 at the selected adjustment point X0 before color adjustment. The achromatic color adjustment unit 13 selects two achromatic color control points having two lightnesses LQ1 and LQ2 located in the vicinity of the adjustment point X0 and sandwiching the lightness L0 among the lightnesses L of all the achromatic control points Qn. Q1 and Q2 are specified (step S31).

Here, the achromatic color adjustment unit 13 treats the LAB value at the achromatic color control point Q1 as [LQ1, aQ1, bQ1]. The achromatic color adjustment unit 13 treats the LAB value at the achromatic color control point Q2 as [LQ2, aQ2, bQ2].

Next, the achromatic color adjustment unit 13 calculates an intermediate adjustment amount T2 (see FIG. 17) at the lightness L0 of the adjustment point X0 from the adjustment amounts of the two achromatic color control points Q1 and Q2 using the following formula (5). Calculate (step S32). Then, the achromatic color adjustment unit 13 calculates the achromatic color adjustment amount T2a at the adjustment point X0 from the intermediate adjustment amount T2 at the lightness L0 at the adjustment point X0 using the following formula (6) (step S33).

In other words, the achromatic color adjustment unit 13 handles the achromatic color adjustment amounts of the achromatic control points Q1 and Q2 and the adjustment point X0 as a function of the lightness L. Considering the continuity of the data color space and the PCS, the achromatic color adjustment unit 13 adjusts the adjustment amount of the chromaticity component a determined by the lightness L, the adjustment amount of the chromaticity component b, and the adjustment amount of the lightness L to the adjustment points. It is proportionally distributed based on the lightness L0 of X0.

式（５）において、無彩色調整部１３は、２つの無彩色制御点Ｑ１，Ｑ２の間の明度差に対する、調整点Ｘ０と無彩色制御点Ｑ１との明度差を、比例配分係数ｇとして扱う。
無彩色調整部１３は、無彩色制御点Ｑ１の無彩色調整量を［ΔＬＱ１，ΔａＱ１，ΔｂＱ１］として扱う。無彩色調整部１３は、無彩色制御点Ｑ２の無彩色調整量を［ΔＬＱ２，ΔａＱ２，ΔｂＱ２］として扱う。

In Expression (5), the achromatic color adjustment unit 13 treats the difference in brightness between the adjustment point X0 and the achromatic control point Q1 as the proportional distribution coefficient g with respect to the difference in brightness between the two achromatic control points Q1 and Q2. .
The achromatic color adjustment unit 13 treats the achromatic color adjustment amount of the achromatic color control point Q1 as [ΔLQ1, ΔaQ1, ΔbQ1]. The achromatic color adjustment unit 13 treats the achromatic color adjustment amount of the achromatic color control point Q2 as [ΔLQ2, ΔaQ2, ΔbQ2].

Then, the achromatic color adjustment unit 13 proportionally distributes the achromatic color adjustment amounts of the achromatic control points Q1 and Q2 using the proportional distribution coefficient g, and converts the adjustment amounts [ΔLQ, ΔaQ, ΔLQ, ΔaQ, ΔbQ]. Note that the achromatic color adjustment unit 13 adjusts the saturation of the intermediate control point Q having the colorimetric value (LAB value) obtained by proportionally distributing the colorimetric value (LAB value) of each of the achromatic control points Q1 and Q2 by the proportional distribution coefficient g. is treated as the minimum saturation CQ (=0) (step 32).

In Expression (6), the achromatic color adjustment unit 13 treats the difference value between the maximum saturation CP and the saturation C0 of the adjustment point X0 as a proportional distribution coefficient (1-h). The achromatic color adjustment unit 13 treats the adjustment amount obtained by proportionally distributing the intermediate adjustment amount T2 of the adjustment point X0 using the proportional distribution coefficient as the achromatic color adjustment amount T2a of the adjustment point X0. (Step S33).

[Processing 5: Rewriting color values]
After performing [Process 3] calculation of the chromatic color adjustment amount and [Process 4] calculation of the achromatic color adjustment amount, the matching control unit 11 calculates the chromatic color adjustment amount T1a and the achromatic color adjustment amount T2a at the adjustment point X0. After the calculation, the profile rewriting unit 14 executes [Process 5] rewriting of color values. That is, the matching control unit 11 synthesizes the chromatic color adjustment amount T1a and the achromatic color adjustment amount T2a for the adjustment point X0 (step S51).

Next, the matching control unit 11 synthesizes the combined adjustment amount and the calorimetric value (LAB value) of the adjustment point X0 into a color value in the RGB color space ( RGB values) are searched for (step S52).

Then, the matching control unit 11 searches for the color values (RGB values) of the RGB color space stored in the memory addresses as the optimum solutions, targeting the memory addresses associated with the grid of the adjustment point X0. The color values (RGB values) are rewritten (step S53). Further, the matching control unit 11 repeats [processing 2] to [processing 5] until the rewriting of all grids is completed.

For example, as shown in FIG. 17, the intermediate adjustment amount T1 is not the adjustment amount of the adjustment point X0, but the adjustment amount obtained by proportionally distributing the adjustment amounts of the chromatic color control points P1 and P2 using the proportional distribution coefficient f. . The intermediate adjustment amount T1 described above is also the adjustment amount of the intermediate control point P having the maximum chroma CP at the hue angle H0 of the adjustment point X0. The combination of the LAB value obtained by converting the LCH value of the intermediate control point P and the intermediate adjustment amount T1 becomes Pa after color adjustment of the intermediate control point P. FIG.

Further, the intermediate adjustment amount T2 described above is not the adjustment amount of the adjustment point X0, but the adjustment amount of each of the achromatic color control points Q1 and Q2 is proportionally distributed by the proportional distribution coefficient g, and has the minimum chroma CQ. is the adjustment amount of the intermediate control point Q. Synthesis of the adjustment amount of the intermediate control point Q and the intermediate adjustment amount T2 becomes Qa after color adjustment of the intermediate control point Q. FIG.

Therefore, in order to obtain the post-color adjustment X0a of the adjustment point X0, the matching control unit 11 uses the following formula (7) to obtain the combined adjustment amount of the adjustment point X0 from the chromatic color adjustment amount T1a and the achromatic color adjustment amount T2a. Calculate T3. Then, the matching control unit 11 synthesizes the LAB value of the adjustment point X0 with the chromatic color adjustment amount T1a and the achromatic color adjustment amount T2a, so that the LAB value of the adjustment point X0 after color adjustment X0a is [L3, a3 , b3] (step S51).

言い換えると、マッチング制御部１１は、調整点Ｘ０の合成調整量Ｔ３を、中間調整量Ｔ１と中間調整量Ｔ２のそれぞれを、ソースプロファイル１５Ａにおける最大彩度ＣＰに対する調整点Ｘ０の彩度Ｃ０との関係によって比例配分した調整量の和として算出させる。これによって、調整点Ｘ０の彩度Ｃ０が高いことによって調整点Ｘ０がソースプロファイル１５Ａにおける最外郭の近くに位置する場合であれば、合成調整量Ｔ３が中間調整量Ｔ１に強い影響を受けるようにもなる。反対に、調整点Ｘ０の彩度Ｃ０が低いことによって調整点Ｘ０がソースプロファイル１５Ａにおける最外郭から離れている場合、すなわちＣＩＥＬＡＢ色空間の明度軸（グレイ軸）の近くに位置する場合であれば、合成調整量Ｔ３が中間調整量Ｔ２に強い影響を受けるようにもなる。

In other words, the matching control unit 11 adjusts the synthesis adjustment amount T3 of the adjustment point X0, the intermediate adjustment amount T1 and the intermediate adjustment amount T2, respectively, to the saturation C0 of the adjustment point X0 with respect to the maximum saturation CP in the source profile 15A. It is calculated as the sum of the proportionally distributed adjustment amounts according to the relationship. As a result, if the adjustment point X0 has a high saturation C0 and is located near the outermost edge of the source profile 15A, the synthetic adjustment amount T3 is strongly influenced by the intermediate adjustment amount T1. will also become Conversely, if the chroma C0 of the adjustment point X0 is low and the adjustment point X0 is away from the outermost contour in the source profile 15A, that is, if it is located near the lightness axis (gray axis) of the CIELAB color space, , the synthesized adjustment amount T3 is strongly influenced by the intermediate adjustment amount T2.

After calculating the synthetic adjustment amount T3 of the adjustment point X0, the profile rewriting unit 14 generates a new LAB value for obtaining the LAB value from the new LAB value X0a that is the synthesis result of the LAB value of the adjustment point X0 and the synthetic adjustment amount T3. search for RGB values in an RGB color space. The search for new RGB values is performed in the same manner as [Processing 1-4] [Processing 1-8] described above. is a search for the optimum solution of the RGB values of (step S52).

After searching for the optimum solution for the adjustment point X0, the profile rewriting unit 14 identifies the memory address of the B2A CLUT of the display profile 15B associated with the grid of the adjustment point X0. Then, the profile rewriting unit 14 rewrites the RGB values of the RGB color space stored in the memory address of the CLUT of B2A of the specified display profile 15B to the searched optimum solution at the adjustment point X0 (step S53).

[Color matching support operation]
The color matching support device 10 stores a reference chromatic color definition list 50a and a reference achromatic color definition list 50b in the storage unit 15 as predetermined ones. Also, the color matching support device 10 acquires the source profile 15A and the display profile 15B from the second device 21, and starts color matching support. The color matching support device 10 uses A2B of the source profile 15A to apply the color values of the data color space in the reference chromatic color definition list 50a and the colorimetric values of the colorimetric color space of the reference achromatic color definition list 50b. , chromatic color control point Pn, and achromatic color control point Qn, chromatic color adjustment amount data 15D1 and achromatic color adjustment amount data 15D2 are initialized as [Process A]. The color matching support device 10 uses A2B of the source profile 15A to search for the optimum solution for the color values in the reference chromatic definition list 50a and the colorimetric values in the reference achromatic definition list 50b. Image data 51 is generated from the color values of the data color space of one device 52 . The color matching support device 10 transfers the image data 51 to the first device 52 . First device 52 outputs image data 51 and provides it to user 55 as color patches 53 .

Next, the color matching support device 10 performs [Processing 1-2] to [Processing 1-4] while displaying the operation screen 21A based on the chromatic color adjustment amount data 15D1. The chromatic color adjustment amount of the chromatic color control point Pn based on the chromatic color control point Pn is acquired, and the chromatic color adjustment amount data 15D1 is updated.

Further, the color matching support device 10 performs [Processing 1-6] to [Processing 1-8] while displaying the operation screen 21B based on the achromatic color adjustment amount data 15D2. The achromatic color adjustment amount of the achromatic control point Qn is obtained, and the achromatic color adjustment amount data 15D2 is updated.

Next, the color matching support device 10 detects pressing of the rewriting instruction section 25P or pressing of the rewriting instruction section 28P. Subsequently, the color matching support device 10 uses the latest adjustment amount of the chromatic color control point Pn and the latest adjustment amount of the achromatic control point Qn to [process 3] adjust the chromatic color adjustment amount for all the adjustment points X0. Calculation and [Process 4] Calculation of achromatic color adjustment amount are performed.

That is, the color matching support device 10 receives a rewriting instruction from the user 55, refers to the latest adjustment amount data 15D, and reflects the latest adjustment amount data 15D in the intermediate adjustment amounts T1 and T2 of each adjustment point X0. . The color matching support device 10 receives the rewriting instruction from the user 55, refers to the latest adjustment amount data 15D, and adds the latest adjustment amount data Reflect 15D. The color matching support device 10 receives the rewrite instruction from the user 55, refers to the latest adjustment amount data 15D, and reflects the latest adjustment amount data 15D in the adjustment amount T3 of each adjustment point X0.

Then, the color matching support device 10 converts the RGB values of the RGB color space stored in the memory address associated with each adjustment point X0 to the searched RGB color space based on the synthesis adjustment amount T3 of the adjustment point X0. is rewritten as the optimal solution of The color matching support device 10 transfers the color-adjusted display profile 15B to the second device 21, and ends the color matching support.

FIG. 18 shows an example of the chromatic control points Pn of the source profile 15A whose data color space is the CMYK color space and their adjustment destinations. FIG. 19 shows an example of the relationship between color reproduction by color matching of the second device 21 when the data color space is the source profile 15A, which is the CMYK color space, and the chromatic color control point Pn before the adjustment amount instruction in FIG. indicates FIG. 20 is an example of the relationship between color reproduction by color matching of the second device 21 when the source profile 15A whose data color space is the CMYK color space, and the chromatic color control point Pn after the adjustment amount instruction in FIG. indicates 19, red (R), green (G), blue (B), cyan (C), magenta (M), yellow (Y), red magenta (RM), yellow red (YR), green yellow (GY), cyan green (CG), and magenta blue (MB) indicate hue angles corresponding to the chromatic color control points Pn before the adjustment amount instruction in FIG. Also, red (R'), magenta (M'), red magenta (RM'), and magenta blue (MB') in FIG. Show the corners.

FIG. 21 shows an example of color reproduction before color adjustment described by the display profile 15B whose data color space is the RGB color space. FIG. 22 shows an example of color reproduction after color adjustment described by the display profile 15B whose data color space is the RGB color space. Note that red (R), blue (B), magenta (M), red magenta (RM), yellow red (YR), and magenta blue (MB) in FIG. Hue angles corresponding to control points Pn are shown. Red (R'), magenta (M'), red magenta (RM'), and magenta blue (MB') in FIG. 22 are hues corresponding to the chromatic color control points Pn after the adjustment amount instruction in FIG. Show the corners.

As FIGS. 19-22 show, the color reproduction described by a profile can be expressed as a projection of a grid onto the profile's data color space onto the CIELAB color space. Further, as shown in FIGS. 19 to 22, the chromatic color control points Pn can also be represented by projecting them onto the CIELAB color space. In this way, the relationship between the color gamut outermost contour in the source profile 15A, the grid on the data color space, and each control point Pn, Qn can be expressed as a positional relationship on the CIELAB color space.

In the color matching using the source profile 15A common between the first device 52 and the second device 21, the color matching support that brings the color reproduced by the second device 21 closer to the color reproduced by the first device 52 uses the second It is necessary to rewrite B2A of display profile 15B, which is the destination profile of device 21 . That is, the color matching support device 10 rewrites the color values (RGB values) of the data color space stored in the memory address associated with the adjustment point Xn in B2A of the display profile 15B. Such rewriting of color values (RGB values) by the color matching support device 10 is to change the reverse color reproduction characteristics of the second device 21 .

On the other hand, the rewriting of color values (RGB values) by the color matching support device 10 can also be seen from the overall color matching process of combining A2B of the source profile 15A and B2A of the display profile 15B. At this time, the rewriting of the color value by the color matching support device 10 is performed by rewriting the color value (RGB value) of the data color space stored in the memory address associated with the adjustment point Xn in B2A of the display profile 15B. be.

In such rewriting of color values, the LAB values stored in the memory addresses associated with the color values (CMYK values) of the A2B data color space of the source profile 15A are set as the adjustment points Xn, and color adjustment is performed to the LAB values. It is also equivalent in result to rewriting to the result of Also, in the second device 21, color matching with respect to the source profile 15A is to reproduce the color values of the data color space (CMYK color space) of the source profile 15A with the color reproduction described by the source profile 15A. be. That is, the color reproduction shown in FIG. 19 is performed.

For example, as shown in FIGS. 18 and 20, [Process 1] In setting the adjustment amounts at the control points Pn and Qn, the chromatic color control point Pn determined based on the source profile 15A and the reference chromatic color definition list 50a , an instruction is input to bring the hue angle H of red (R) closer to the hue angle of yellow (Y). It is also assumed that an instruction is input to bring the hue angle H of red magenta (RM) closer to the hue angle of yellow (Y). Also, assume that an instruction is input to bring the hue angle H of magenta (M) closer to the hue angle of red (R). It is also assumed that an instruction is input to bring the hue angle H of magenta blue (MB) closer to the hue angle of magenta (M).

Upon receiving these instructions, the color matching support device 10 converts grid points on the data color space (RGB color space) of the second device 21 to yellow red (YR) on the chromaticity plane, as shown in FIG. B2A of the display profile 15B is rewritten so that it is concentrated between magenta (M). In addition, the color matching support device 10 changes the display profile 15B so that the grid points on the data color space (RGB color space) of the second device 21 are scattered between magenta (M) and blue (B). Rewrite B2A.

On the other hand, in the entire color matching process, as shown in FIG. 20, the color matching support device changes the lattice points on the data color space (CMYK color space) of the source profile 15A in the chromaticity plane as follows. 10 rewritten the display profile 15B. In other words, the color matching support device 10 rewrites the display profile 15B so that the grid points on the data color space (CMYK color space) of the source profile 15A are concentrated between yellow red (YR) and magenta (M). A change in color reproduction equivalent to that of Also, the color matching support device 10 rewrites the display profile 15B so that the grid points on the data color space (CMYK color space) of the source profile 15A are scattered between magenta (M) and blue (B). A comparable change in color reproduction is obtained.

In this way, in color matching, the color matching support device 10 can match the reverse color of the destination profile of the second device 21 without changing the source profile 15A shared by the first device 52 and the second device 21 . Rewrite reproduction information. Thereby, the color matching support device 10 brings the color reproduced by the second device 21 closer to the color reproduced by the first device 52 .

According to the above embodiment, the following effects can be obtained.
(1) Comparing the colors reproduced by the second device 21 and the colors reproduced by the first device 52 is performed together with comparing the position of each color in the colorimetric color space of the operation screens 21A and 21B. . Therefore, while having the user 55 visually check the positions of the control points Pn and Qn reproduced by the second device 21 in the colorimetric color space, the user 55 is instructed to adjust the chromatic color control point Pn and the achromatic color control point Qn. can be encouraged. As a result, the user 55 can intuitively select the chromatic color control point Pn and the achromatic color control point Qn to be adjusted, and instruct the content of adjustment. As a result, it is possible to shorten the time required for the adjustment work and improve the matching accuracy.

(2) In B2A of the display profile 15B, the color value 15BCT at the memory address associated with the grid is rewritten to a new color value 15BCT (RGB value) based on the corresponding LAB value of the grid. As a result, the second device 21 using the rewritten B2A can bring the color reproduced by the second device 21 closer to the color reproduced by the first device 52 without requiring a dedicated colorimetric device.

(3) A colorimetric value (LAB value) associated with a point to be adjusted in A2B of the display profile 15B is calculated as an optimum solution search using A2B of the display profile 15B itself. Therefore, the accuracy related to the colorimetric values (LAB values) of the point to be adjusted for the chromatic color control point Pn and the point to be adjusted for the achromatic control point Qn is increased.

(4) Visually comparing the chromatic colors reproduced by the first device 52 and the chromatic colors reproduced by the second device 21 is performed together with comparing the position of each control point in the LCH coordinate system of the operation screen 21A. will be The comparison of the achromatic color reproduced by the first device 52 and the achromatic color reproduced by the second device 21 is performed together with the visual comparison of the positions of the respective control points in the LAB coordinate system of the operation screen 21B. .

As a result, the coordinate system of the operation screens 21A and 21B indicating the positions of the control points Pn and Qn becomes a coordinate system in which the positions of the control points Pn and Qn can be more easily grasped by human intuition. Therefore, it is possible to prompt the user 55 to adjust the control points Pn and Qn while allowing the user 55 to view the position of the color reproduced by the second device 21 in the PCS with higher accuracy.

(5) Based on the chromatic color adjustment amount and the achromatic color adjustment amount, the color value 15BCT (RGB value) after color adjustment in the RGB color space associated with each adjustment point Xn is interpolated. As a result, the second device 21 using the rewritten B2A can accurately reproduce colors reproduced by the first device 52 between the chromatic color adjustment point and the achromatic color adjustment point.

(6) Using a plurality of chromatic color control points Pn and a plurality of achromatic color control points Qn for the CLUT enables highly flexible color adjustment suited locally to the color gamut of the second device 21. becomes.
Note that the above embodiment can also be implemented as follows.

[Color adjustment]
[Process 3] The calculation of the chromatic color adjustment amount is not limited to the interpolation of the adjustment amount depending on the hue angle H, and may be changed to the interpolation of the adjustment amount depending on the hue angle H and the lightness L. In short, the chromatic color adjustment and the achromatic color adjustment may be a process of interpolating the adjustment amount of the adjustment point X0 based on the colorimetric value of the adjustment point X0 using the adjustment amounts of the control points Pn and Qn.

For example, as shown in FIG. 23, on the line segment connecting the chromatic color control point P1 and the gray g0 in the achromatic color control point Qn, the point having the lightness L0 equal to the adjustment point X0 is the secondary control point. Let it be P1'. On the line segment connecting the chromatic color control point P2 and the gray g100 in the achromatic color control point Qn, the point having the brightness L0 equal to the adjustment point X0 is defined as the secondary control point P2'.

As shown in FIGS. 23 and 24, the brightness of the secondary control point P1' is the brightness L0 of the adjustment point X0, the hue angle and the hue angle adjustment amount are the same as those of the chromatic color control point P1, and the hue angle is the hue angle H1 and the hue angle adjustment amount ΔHP1.

In addition, the saturation and lightness adjustment amount of the secondary control point P1′ and the saturation adjustment amount are given by , is obtained based on the ratio of the difference between the lightness Lg0 of the gray g0 in the achromatic control point Qn and the lightness L0 of the adjustment point X0. That is, the saturation, lightness adjustment amount, and saturation adjustment amount of the secondary control point P1' are proportionally distributed based on the ratio of the difference described above, and the saturation, lightness adjustment amount, and chroma obtained as a degree adjustment amount. That is, the LHC value of the secondary control point P1' is treated as [L0, H1, CP1'], and the adjustment amount is treated as [.DELTA.LP1', .DELTA.HP1, .DELTA.CP1'].

Further, the lightness of the secondary control point P2' is the lightness L0 of the adjustment point X0, the hue angle and the hue angle adjustment amount are the same as those of the chromatic color control point P2, the hue angle is the hue angle H2, and the hue angle This is the adjustment amount ΔHP2.

In addition, the saturation and lightness adjustment amount of the secondary control point P2′ and the saturation adjustment amount are the difference between the lightness Lg100 of the gray g100 in the achromatic control point Qn and the lightness LP2 of the chromatic color control point P2. , is obtained based on the ratio of the difference between the lightness Lg100 of the gray g100 in the achromatic control point Qn and the lightness L0 of the adjustment point X0. That is, the saturation, lightness adjustment amount, and saturation adjustment amount of the secondary control point P2′ are proportionally distributed based on the above-described difference ratio, and the saturation, lightness adjustment amount, and saturation adjustment amount of the chromatic color control point P2 obtained as a degree adjustment amount. That is, the LHC value of the secondary control point P2' is treated as [L0, H2, CP2'], and the adjustment amount is treated as [.DELTA.LP2', .DELTA.HP2, .DELTA.CP2'].

Then, the color matching support device 10 calculates the colorimetric value and chromatic color adjustment amount of the secondary control point P1′ and the colorimetric value and chromatic color adjustment amount of the secondary control point P2′ by the above equation (2). ) (3) to calculate the chromatic color adjustment amount and the achromatic color adjustment amount of the adjustment point X0.

[Combination of color spaces]
- In the above embodiment, the color space of each of the control points Pn and Qn, the color space of the adjustment point X0, and the PCS are the CIELAB color space. That is, the color matching support device 10 (i) identifies the adjustment point X0 from the LAB value corresponding to the B2A grid of the display profile 15B, and (ii) uses A2B of the display profile 15B to determine the LAB value after color adjustment. , the optimum solution of the RGB values is calculated.

By changing this, the PCS is the CIEXYZ color space, and the color matching support device 10 may (i) convert the XYZ values corresponding to the grid into LAB values to identify the adjustment point X0. Then, the color matching support device 10 (ii) converts the LAB values after color adjustment into XYZ values, and uses A2B of the display profile 15B to calculate the optimum solution of the RGB values from the converted XYZ values. good.

Alternatively, PCS is the CIELAB color space, and the color matching support device 10 (i) converts the RGB values of the memory address associated with the grid into LAB values using A2B of the display profile 15B, and adjusts the adjustment point X0. may be specified. Then, the color matching support device 10 may (ii) use A2B of the display profile 15B to calculate an optimum solution of RGB values from the LAB values after color adjustment.

Alternatively, the color matching support device 10 (i) forwards the RGB values of the RGB color space at the memory address associated with the grid to the color values of the HLS color space composed of the hue angle, saturation, and luminance. , and a transformation value obtained by transforming the HS plane into rectangular coordinates may be specified as the adjustment point X0. Then, the color matching support device 10 may reversely convert the HLS values obtained by color adjustment into RGB values.

[Color matching target]
- The first device 52 is not limited to an output device, and may be a display device. At this time, the reference chromatic color definition list 50a and the image data 51 are represented by color values (RGB values) in the RGB color space of the data color space of the display device.

The color matching support device 10 may change the LCH coordinate system displayed on the operation screen 21A to the LAB coordinate system, and may receive the movement of the chromatic color control point Pn as the adjustment amount of the LAB value. Even with such a configuration, the color of the control point Pn reproduced by the display device and the color of the LAB coordinate system are compared based on the visual observation of the user 55 in the LAB coordinate system of the operation screen 21A. As described above, if the operation screen 21A is configured to display the LCH coordinate system in which the relationship between the color space and the color can be easily grasped, it is possible for the user 55 to specify the adjustment amount with higher accuracy.

• The first device 52 may be a display device and the second device 21 may be a display device. That is, the first device 52 is either an output device or a display device. The second device 21 is a display device.

• The first device 52 may be a non-standardized device, and the source profile 15A may not be a printing standard compliant profile. Even with such a configuration, the color matching support device can match the color displayed by the second device 21 with the color output by the first device 52 .

[How to set the control point value]
The color matching support device 10 uses A2B of the source profile 15A to calculate the colorimetric values of the chromatic color control points Pn corresponding to the reference chromatic color definition list 50a for the data color space (CMYK color space) of the source profile 15A. use. By changing this, the color matching support device 10 uses the display A2B of profile 15B may be used. At this time, the color values of the data color space of the source profile 15A in the reference chromatic color definition list 50a are described for the data color space (RGB color space) of the display profile 15B.

[Object of visual comparison]
The color matching support device 10 generates the image data 51 according to the reference chromatic definition list 50a, the reference achromatic definition list 50b, and A2B of the source profile 15A. The first device 52 outputs color patches 53 from the image data 51 generated by the color matching support device 10 . The color matching support device 10 determines the chromatic color control point Pn corresponding to the color patch 53 based on the adjustment amount data 15D obtained from the reference chromatic color definition list 50a, the reference achromatic color definition list 50b, and the source profile 15A. Colors are reproduced on the operation screen 21A. The color matching support device 10 determines the achromatic color control point Qn corresponding to the color patch 53 based on the adjustment amount data 15D obtained from the reference chromatic color definition list 50a, the reference achromatic color definition list 50b, and the source profile 15A. Colors are reproduced on the operation screen 21B. The user 55 visually compares the colors of the color patches 53 and the colors reproduced on the operation screens 21A and 21B, and adjusts the operation screens 21A and 21B so that the colors of the color patches 53 are displayed on the operation screens 21A and 21B. Indicate the degree of change in the reproduced color.

By changing this, the object to be visually compared by the user 55 may be a photographic natural image by a camera or the like, or an image generated by computer graphics. That is, the image data 51 may include natural images and computer graphics. At this time, the first device 52 outputs a natural image or computer graphics, and the color matching support device 10 reads the image data 51 into the storage unit 15 instead of generating the image data 51, , A2B of the source profile 15A and B2A of the display profile 15B are applied to the second device 21 to reproduce the natural image or computer graphics included in the image data 51 . A user 55 visually compares the natural image or computer graphics output from the first device 52 and the reproduction on the second device 21 . The user 55 uses the operation screens 21A and 21B to instruct the degree of color change so that the color of the output of the first device 52, which is a natural image or computer graphics, is reproduced on the second device 21. may

At this time, the color matching support device 10 performs color matching on the image data 51 using A2B of the source profile 15A and B2A of the display profile 15B, and displays the image on the second device 21 . Every time the display profile 15B is rewritten, the color matching support device 10 color-matches the image data 51 with A2B of the source profile 15A and B2A of the display profile 15B, and updates the display on the second device 21. .

As described above, in the color matching support device 10, when the image data 51 is color-matched by A2B of the source profile 15A and B2A of the display profile 15B, and the image is displayed on the second device 21, color matching support is performed. The device 10 is configured as follows. That is, the color matching support device 10 is configured so as to separately store the image data 51 before color matching and the image data to be rewritten by color matching in the storage unit 15 and not change the image data 51 before color matching. ing.

[Optimal solution search]
Before rewriting B2A of the display profile 15B, the color matching support device 10 uses the display profile 15B as a method of obtaining the color value (RGB value) in the RGB color space of the chromatic control point Pn in [Processing 1-4]. A2B-based optimal solution search is used. By changing this, when reversible conversion is established in A2B and B2A that constitute the display profile 15B before adjustment, the color matching support device 10 may use the following method. That is, the color matching support device 10 may perform conversion using B2A before color adjustment that constitutes the display profile 15B in order to obtain a color value (RGB value) in the RGB color space of the chromatic color control point Pn. .

Before rewriting B2A of the display profile 15B, the color matching support device 10 uses the display profile 15B as a method of obtaining the color value (RGB value) in the RGB color space of the achromatic control point Qn in [Processing 1-8]. A2B-based optimal solution search is used. By changing this, if reversible conversion is established between A2B and B2A that constitute the display profile 15B before color adjustment, the color matching support device 10 may use the following method. That is, the color matching support device 10 may perform conversion using pre-color-adjusted B2A that constitutes the display profile 15B in order to obtain a color value (RGB value) in the RGB color space of the achromatic control point Qn. .

- Before rewriting B2A of the display profile 15B, the color matching support device 10 uses the optimum solution search based on A2B of the display profile 15B as a method of obtaining RGB values from the LAB values after color adjustment in [Process 5]. . By changing this, if reversible conversion is established between A2B and B2A that constitute the display profile 15B before color adjustment, the color matching support device 10 may use the following method. That is, the color matching support device 10 may perform conversion using B2A before color adjustment that constitutes the display profile 15B in order to obtain RGB values from LAB values after color adjustment.

Note that, as described above, in [Processing 1-4] [Processing 1-8] [Processing 5], when performing conversion using B2A before color adjustment that constitutes the display profile 15B, the color matching support device 10 , constructed as follows: That is, the color matching support device 10 is configured to store B2A before color adjustment and B2A to be rewritten, which constitute the display profile 15B, separately in the storage unit 15 so as not to change B2A before color adjustment. .

[A2B color adjustment]
- The color matching support device 10 may rewrite the LAB value of A2B, which constitutes the display profile 15B, to the optimum solution after rewriting B2A, which constitutes the display profile 15B, based on the B2A.

The color matching support device 10 identifies the adjustment point X0 from the LAB value held at the memory address corresponding to the A2B grid that constitutes the display profile 15B, and inverts the positive/negative of the adjustment amount of the adjustment amount data 15D. Applied color adjustments may be made. Further, the color matching support device 10 may perform color adjustment by reversing the positive/negative of the color adjustment amount of the adjustment amount data 15D, and rewrite A2B based on the color adjustment. Furthermore, after rewriting A2B based on the color adjustment, the color matching support device 10 uses A2B to search for the optimum solution for the RGB values held at the memory address corresponding to the grid of B2A, and finds the optimum solution. B2A may be rewritten based on the search.

[network]
- The color matching support device 10, the first device 52, and the second device 21 are not connected to the network, and the second device 21 receives the support of the color matching support device 10 exclusively. Not limited to this, the color matching support device 10 and the first device 52 or the second device 21 may be connected by a network. The first device 52 and the second device 21 are connected to a network on the client side, and the color matching support device 10 is connected on the server side, thereby changing the configuration to execute the color matching support of the second device 21. may

For example, as shown in FIG. 25, the color matching support device 10 is connected to a network 65 by a web server 61, and the first device 52 and the second device 21 are connected to the network 65 by web browsers 62 and 63. there is The web server 61 and web browsers 62 and 63 transmit and receive data, profiles, and operation screens 21A and 21B according to the hypertext protocol, file transfer protocol, and the like.

The web server 61 receives a request for one of [process A] to [process C] from the web browser 63 of the second device 21 . The web server 61 calls the color matching support device 10 via CGI 60A, 60B, 60C (Common Gateway Interface) corresponding to each request, and executes the processing requested by the web browser 63 . The web server 61 passes the adjustment amount value and profile received from the web browser 63 of the second device 21 to the color matching support device 10 via the CGIs 60A, 60B, and 60C.

The web browser 63 of the second device 21 transfers the source profile 15A and the display profile 15B to the web server 61 in response to the request for [process A]. The web browser 63 of the second apparatus 21 receives the rewritten display profile 15B from the web server 61 at the end of the [process C] by the color matching support apparatus 10 in response to the request for [process C].

The first device 52 receives the image data 51 generated in [Processing A] by the web browser 62 of the first device 52 . At this time, the web browser 62 of the first device 52 transmits that it is the same client as the web browser 63 of the second device 21 .

The operation screen 21A and the operation screen 21B are displayed on the web browser 63 of the second device 21 . The CGIs 60A, 60B, 60C obtain the adjustment amount data 15D updated by the color matching support device 10 in [Processing A] [Processing B], and [Processing 1-4] [Processing 1- 8], the operation screen 21A and the operation screen 21B in hypertext format are generated from the optimal solution RGB values. The CGIs 60A, 60B, 60C transmit the operation screen 21A and the operation screen 21B to the web browser 63 of the second device 21 via the web server 61. FIG. The web browser 63 of the second device 21 receives the hypertext format operation screen 21A and the operation screen 21B, and formats and displays the operation screen 21A and the operation screen 21B on the screen of the web browser 63 of the second device 21. .

When the adjustment amount is changed on the operation screen 21A or the operation screen 21B, the web browser 63 of the second device 21 sends a request for [processing B] and the adjustment amount instructed to the web server 61. Forward.

Note that the display profile 15B transmitted by the web browser 63 of the second device 21 in [processing A], and the adjustment amount data 15D and image data 51 initialized by the color matching support device 10 in [processing A] are sent to the web server 61 managed by each client. In the requests of [Processing B] and [Processing C] as well, the Web server 61 identifies the client that requested the processing, and transfers the display profile 15B and the adjustment amount data 15D of the client to the color matching support device 10 . Also, the color matching support apparatus 10 may be distributed over the network 65 for each of [Processing A] to [Processing C].

Thus, in the network, by arranging the color matching support device 10 on the server side and arranging the second device 21 on the client side, one color matching support device 10 can be used to simultaneously and in parallel with a plurality of second devices. 21 to enable implementation of color matching support.

Pn... Chromatic control point P1, P2... Chromatic control point Q1, Q2... Achromatic control point Qn... Achromatic control point Xn... Adjustment point X0... Adjustment point 10... Color matching support device 10T... Color adjustment unit 11... Matching Control unit 11S1 Saturation lightness plane 11S2 Outermost color gamut 11S3 Point of CIELAB color space 12 Chromatic color adjustment unit 13 Achromatic color adjustment unit 14 Rewrite unit 15 Storage unit 15A Source profile 15B Display profile 15BCT Color value 15C Color matching support program 15D Adjustment amount data 15D1 Chromatic color adjustment amount data 15D2 Achromatic color adjustment amount data 151C Reference chromatic color identifier 1510 Reference chromatic color LCH value 151T Chromatic color adjustment amount 152C Reference Achromatic color identifier 1520 Reference achromatic color LAB value 152T Achromatic adjustment amount 21 Second device 21A, 21B Operation screen 22 Adjustment amount indication before color display section 23 Adjustment amount after indication color display section 24, 27 Adjustment Quantity instruction unit 25A H value display unit 25B CL value display unit 25P, 28P Rewrite instruction unit 26 AB chromaticity display unit 28A AL value display unit 28B BL value display unit 28C Brightness display unit 50 Reference color Definition list 50a... Reference chromatic color definition list 50b... Reference achromatic color definition list 51... Image data 52... First device 53... Color patch 55... User

また、マッチング制御部１１は、［処理Ａ］として、無彩色調整量データ１５Ｄ２を初期化する。まず、マッチング制御部１１は、無彩色調整量データ１５Ｄ２の無彩色調整量１５２Ｔに初期値として０を反映する。

In addition, the matching control unit 11 initializes the achromatic color adjustment amount data 15D2 as [processing A]. First, the matching control unit 11 reflects 0 as an initial value in the achromatic color adjustment amount 152T of the achromatic color adjustment amount data 15D2.

ここで、［基準色定義リスト５０］および［画像データ５１］において説明したように、基準有彩色定義リスト５０ａに基づく有彩色制御点Ｐｎは、ＣＩＥＬＡＢ色空間におけるソースプロファイル１５Ａの色域の最外郭上の頂点、または稜線上の点である。２つの有彩色制御点Ｐ１，Ｐ２もまた、ソースプロファイル１５Ａの色域の最外郭上の頂点、または稜線上の点である。これらから、各有彩色制御点Ｐ１，Ｐ２の測色値（ＬＣＨ値）を比例配分係数ｆによって比例配分した測色値（ＬＣＨ値）を有する中間制御点Ｐもまた、第１装置５２の色域の最外郭上の頂点、または稜線近傍に位置すると見なされる。

Here, as described in [reference color definition list 50] and [image data 51], the chromatic color control points Pn based on the reference chromatic color definition list 50a are the outermost contours of the color gamut of the source profile 15A in the CIELAB color space. A vertex above, or a point on a ridge. The two chromatic color control points P1 and P2 are also points on the outermost vertices or edges of the color gamut of the source profile 15A. From these, the intermediate control point P having the colorimetric value (LCH value) obtained by proportionally distributing the colorimetric value (LCH value) of each of the chromatic control points P1 and P2 by the proportional distribution coefficient f is also the color of the first device 52. It is considered to be located near the vertex or edge on the outermost contour of the area.

Claims (11)

Forward color reproduction information for correlating a point in a colorimetric color space to a color value in a data color space, and backward color reproduction information for correlating a color value in the data color space to a point in the colorimetric color space. a storage unit that stores
A display device that uses the backward color reproduction information to reproduce the color value of the data color space associated with the point of the colorimetric color space as the color of the point, and the color reproduced by the display device. a color adjusting unit that brings the to closer to the desired color;
A color matching support device comprising
The color adjustment unit
An operation screen is displayed on the display device so as to indicate the control point at the position of the control point in the colorimetric color space, and a point to be an adjustment destination of the control point is received through operation of the operation screen. processing;
applying to a plurality of adjustment points in the colorimetric color space a transformation in which color values in the data color space to which the points to be adjusted are mapped are mapped to the control points; and rewriting the correspondence between each adjustment point in the reproduction information and the color value of the data color space. The color adjustment unit
In the process of rewriting the association,
2. The color matching support device according to claim 1, wherein the color value of the data color space associated with the point to be adjusted in the forward color reproduction information is calculated using the forward color reproduction information. The color adjustment unit
In the process of rewriting the association,
3. The color matching support device according to claim 1, wherein a point of said colorimetric color space predetermined in said backward color reproduction information is referred to, and said point is used as said adjustment point. The color adjustment unit
In the process of receiving a point to be adjusted for the control point,
displaying the operation screen on the display device so as to reproduce the control point as a color at the position of the control point in the colorimetric color space, and adjusting the control point through the operation of the operation screen; a point is received, a color value of the data color space associated with the point to be adjusted in the forward color reproduction information is calculated, and the display device reproduces the color value based on the calculated color value 4. The color matching support device according to any one of claims 1 to 3, wherein the operation screen is updated so as to display colors to be used. The coordinate values of the control points are coordinate values in a color space that undergoes reversible transformation with lightness values, saturation values, and hue values, and include coordinate values indicating a chromatic color,
The color adjustment unit
In the process of updating the operation screen,
converting the coordinate values of the control points into lightness values, chroma values, and hue values; Receives a lightness value, a saturation value, and a hue value as points to be adjusted, and converts the lightness value, saturation value, and hue value, which are the points to be adjusted, into coordinate values of the control point. calculating the color values of the data color space associated with the converted coordinate values of the control points in the forward color reproduction information, and calculating the colors reproduced by the display device based on the calculated color values; 5. The color matching support device according to claim 4, wherein the operation screen is updated so as to be displayed. the control point includes a LAB value indicating a chromatic color;
The color adjustment unit
In the process of updating the operation screen,
converting the LAB values into LCH values, causing the display device to display the operation screen showing the positions of the control points in the LCH coordinate system, and receiving the LCH values as points to be adjusted for the control points; , converting the LCH value, which is the point to be adjusted, into a LAB value, calculating the color value of the data color space associated with the converted LAB value in the forward color reproduction information, and calculating the calculated color value 5. The color matching support device according to claim 4, wherein said operation screen is updated so as to display colors reproduced by said display device based on color values. The color adjustment unit
6. The color matching support device according to claim 5, wherein a point to be an adjustment destination of the control point is received by a movement operation of the control point in the lightness-chroma-hue coordinate system displayed on the operation screen. The color adjustment unit
7. The color matching support device according to claim 6, wherein a point to be an adjustment destination of the control point is received by a movement operation of the control point in the LCH coordinate system displayed on the operation screen. The control points comprise a chromatic control point and an achromatic control point,
The color adjustment unit
In the process of rewriting the association,
A transformation in which the color values of the data color space are associated with the chromatic control points, which are associated with the points to which the chromatic control points are adjusted, are associated with the points to which the achromatic control points are adjusted. applying a combined transformation of the data color space color values to the achromatic control points to a plurality of adjustment points in the colorimetric color space, thereby reducing the inverse color reproduction information to 9. The color matching support device according to any one of claims 1 to 8, wherein the correspondence between each adjustment point and the color value of the data color space is rewritten. Forward color reproduction information for correlating a point in a colorimetric color space to a color value in a data color space, and backward color reproduction information for correlating a color value in the data color space to a point in the colorimetric color space. a storage unit that stores
A display device that uses the backward color reproduction information to reproduce the color value of the data color space associated with the point of the colorimetric color space as the color of the point, and the color reproduced by the display device. a color adjusting unit that brings the to closer to the desired color;
A color matching support method using
The color adjustment unit
An operation screen is displayed on the display device so as to indicate the control point at the position of the control point in the colorimetric color space, and a point to be an adjustment destination of the control point is received through operation of the operation screen. processing;
applying to a plurality of adjustment points in the colorimetric color space a transformation in which color values in the data color space to which the points to be adjusted are mapped are mapped to the control points; and rewriting the correspondence between each adjustment point in the reproduction information and the color value of the data color space. Color matching support device,
Forward color reproduction information for correlating a point in a colorimetric color space to a color value in a data color space, and backward color reproduction information for correlating a color value in the data color space to a point in the colorimetric color space. a storage unit that stores
A display device that uses the backward color reproduction information to reproduce the color value of the data color space associated with the point of the colorimetric color space as the color of the point, and the color reproduced by the display device. A color matching support program that functions as a color adjustment unit that brings the color closer to the desired color,
In the color adjusting section,
An operation screen is displayed on the display device so as to indicate the control point at the position of the control point in the colorimetric color space, and a point to be an adjustment destination of the control point is received through operation of the operation screen. processing;
applying to a plurality of adjustment points in the colorimetric color space a transformation in which color values in the data color space to which the points to be adjusted are mapped are mapped to the control points; A color matching support program for rewriting the correspondence between each adjustment point in reproduction information and the color value of the data color space.

Images