JP2002232727A - Color adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement a color correction method for allowing adjustment of gray balance or a color shift which are incident to initialization and variation with time of an image output device, and replacement of a consumable material with an accuracy desired by a user just by means of a visual estimation without using a measurement instrument or an image input device by the user. SOLUTION: The color adjustment method outputs a first primary color chart which is obtained by an image recording apparatus using predetermined gradation data of the first primary color and a chart which is obtained by fixing the gradation data of the first primary color and varying gradation data of a second and a third primary colors respectively, acquires a reference density correction value by comparing the first primary chart with a first primary color reference chart in which the first primary density is varied, acquires a gray balance correction value by comparing a gray reference chart corresponding to the reference density correction value with the outputted chart, thereby performing color adjustment of the image recording apparatus with the reference density correction value and gray balance correction value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color tone correcting method for an image processing apparatus, and more particularly to a method for adjusting a gray balance in various color image recording apparatuses such as a color copying machine, a color automatic developing machine and a color printer. The present invention relates to a color tone correction method.

[0002]

2. Description of the Related Art Recently, the bottom of image output apparatuses has been widened, and image output apparatuses corresponding to various output methods and paper sizes have been commercialized. Especially in terms of paper size, A
From large format sizes such as 0 and A1 to those specializing in normal silver halide photographic sizes such as A6, they have been developed according to purposes and applications.

[0003] When color tone correction such as gray balance calibration or adjustment is performed by an image output device, a step chart of gray and each primary color is output and printed by the image output device, and the amount of gray shift is discriminated by a measuring device or the like, and various types of gray scale are determined. It is common to calibrate or adjust the balance in a way.

For example, when calibrating "Pictography" (trade name of a silver halide photographic printer) commercially available from Fuji Photo Film Co., Ltd., each primary color (cyan) is arranged in two rows in parallel with the printing direction. The gray balance can be adjusted by printing a patch having patches of different densities of Cy, magenta Mg, and yellow Ye) and measuring these patches in a total of six rows with a calibrator. The configuration of the step chart used at this time is not particularly defined, and at present, each company uses its own chart.

On the other hand, as an image processing apparatus relating to color tone correction, a utility realized on a printer driver as a support utility for nozzle position adjustment and accompanying density adjustment in an ink jet printer, or a dedicated color tone correction support utility other than the printer driver is realized. There is something.

[0006]

In the case where color tone correction such as gray balance calibration or adjustment is performed by the above-described image output device, it is premised that an image measurement device such as a colorimeter or a scanner is used. There is a problem that the whole system becomes expensive.

[0007] In addition, there has been no existing density adjustment support utility configured to support gray balance adjustment by eye measurement with respect to the above color tone correction.

The present invention has been made in view of the above circumstances, and has as its object the initial setting of an image output device, deterioration over time,
The user of the image output device can adjust the gray balance or color shift due to the replacement of the ink sheet, toner and receiving paper by simple visual measurement without using the measuring device and the image input device and with the accuracy desired by the user. It is another object of the present invention to realize a color correction method.

[0009]

The above objects of the present invention have been attained by the following constitutions.

[0010] 1. The image recording apparatus fixes the first primary color chart obtained by using predetermined gradation data of the first primary color, the gradation data of the first primary color, and the second primary color chart.
And a chart obtained by changing the gradation data of the third primary color, and comparing the first primary color chart with the first primary color reference chart in which the density of the first primary color is changed. By doing so, a reference density correction value is obtained, and the gray reference chart corresponding to the obtained reference density correction value, the gradation data of the first primary color are fixed, and the gradations of the second and third primary colors are fixed. A gray balance correction value is obtained by comparing a chart obtained by changing each data, and color adjustment of the image recording apparatus is performed based on the obtained reference density correction value and gray balance correction value. Characteristic color adjustment method.

2. The image recording apparatus fixes the first primary color chart obtained by using predetermined gradation data of the first primary color, the gradation data of the first primary color, and the second primary color chart.
And a chart obtained by changing the gradation data of the third primary color, and comparing the first primary color chart with the first primary color reference chart in which the density of the first primary color is changed. To obtain a reference density correction value, and fixing the skin color reference chart corresponding to the obtained reference density correction value and the gradation data of the first primary color,
A skin color correction value is obtained by comparing a chart obtained by changing the gradation data of the second and third primary colors, respectively, and the image recording is performed based on the obtained reference density correction value and the obtained skin color correction value. A color adjustment method comprising performing color adjustment of a device.

3. A first primary color chart obtained by changing gradation data of the first primary color by the image recording apparatus;
A chart obtained by fixing the gradation data of the first primary color and changing the gradation data of the second and third primary colors is output, and the first primary color chart and the first primary color are output. Is compared with a first primary color reference chart having a constant density, a reference density correction value is obtained, and a gray reference chart corresponding to the obtained reference density correction value and gradation data of the first primary color are obtained. While fixing
A gray balance correction value is obtained by comparing with a chart obtained by changing the gradation data of the second and third primary colors, respectively, and based on the obtained reference density correction value and gray balance correction value, A color adjustment method comprising performing color adjustment of an image recording apparatus.

4. 3. The color adjustment method according to the above 1 or 2, wherein the first primary color reference chart is created by gradation data in which gradation data is continuously changed.

5. 4. The color adjustment method according to claim 3, wherein the first primary color chart obtained by changing the gradation data of the first primary color is created by gradation data in which the gradation data is continuously changed.

6. Any one of the above 1 to 5, wherein the gradation data of the first primary color is fixed and the chart is created with gradation data obtained by continuously changing the gradation data of the second and third primary colors. The color adjustment method according to claim 1.

7.3 The color adjusting method according to any one of the above items 1 to 6, wherein the three primary colors are yellow, magenta, and cyan, and the first primary color is magenta.

8. The color adjustment method according to any one of the above items 1 to 7, wherein the gray balance of the gray reference chart is in a range of a ^* = − 5 to +5 and b ^* = − 5 to 0.

9. When the density of the gray reference chart is L value =
9. The color adjusting method according to any one of the above items 1 to 8, wherein the color adjusting value is in a range of 45 to 85 or a density value of 0.2 to 1.0.

10. 10. The color adjustment method according to any one of the above items 1 to 9, wherein a dummy image is provided at a leading portion of a chart image to be determined for determining a correction value.

According to the present invention, the user of the image output device can measure the initial setting and the change over time of the image output device, the gray balance or the color shift due to the replacement of the ink sheet, the toner and the image receiving paper. The present invention has been found that it is possible to make adjustments by simple visual measurement and with the accuracy desired by the user, without using, and using a chart and a reference chart.

In a printer, the image quality tends to deteriorate unless the gray tint is gray, and ideally, the hue 0 (a ^* = 0, b ^* = 0) at all densities of gray.
It is preferred that However, the accuracy cannot be maintained in a printer of an actual specification for producing gray by superimposing Y, M, and C.

The present inventors have found that when the gray color shifts to the yellow side (b ^* > 0), the image becomes blurred as a whole, and conversely, when the color shifts slightly in the cyan and magenta directions, It is confirmed that such a blur does not occur, and a slight change in the gray tint occurs by setting the gray tint slightly to b ^* <0 based on this. It was confirmed that no image blur occurred.

When the gray density and color are adjusted at one point, L value = 45 to 85 or density value 0.2 to 1.0
Since it is also the density region of the Japanese skin color which is the most important in the image, it has been found that adjusting in this regard stabilizes the image quality most.

The present invention is characterized in that color adjustment of an image recording apparatus is performed based on a reference density correction value and a gray balance correction value or a skin color correction value obtained by the following methods. The terms are defined as follows.

A "chart" refers to a one-dimensional or two-dimensional (two-axis X-axis, Y-axis, etc.) image pattern array, and includes one kind, one patch, or a plurality of kinds, a plurality of patches. And symbols. Each individual patch may be composed of uniform data, or image data such as gradation may vary in one patch.

The "reference chart" refers to a chart in which the image density and gray balance (color) are clearly measured by a densitometer, a colorimeter, or the like.

The term "gradation data" refers to input data for outputting an image. The gradation data in the image recording apparatus corresponds to the output image density in a predetermined relationship using a conversion table or the like. Attached.

"Fixed" means that the gradation data is set to a constant value. “Gray balance” refers to a gray tint and is represented by two values of a ^* and b ^* . L indicates brightness,
Color can be expressed by three values of L, a ^* , and b ^* .

“Γ” is a coefficient of a power function for controlling the gradation characteristic, and the gradation characteristic is defined by setting the value of γ.

The reference density correction value in the present invention is obtained by changing the first primary color chart obtained by using predetermined gradation data of the first primary color and the density of the first primary color, output from the image recording apparatus. It is obtained by comparing with the first primary color reference chart.

The density correction value may be found using a mixture of a plurality of primary colors instead of one primary color. However, in the case of mixed colors, the color is slightly different from that of the reference chart, and the matching accuracy is lower than that of one primary color.

Next, the gray balance correction value in the present invention fixes the gray reference chart corresponding to the obtained reference density correction value and the gradation data of the first primary color output by the image recording apparatus. At the same time, it is obtained by comparing with a chart obtained by changing the gradation data of the second and third primary colors, respectively.

Then, the color adjustment of the image recording apparatus is performed based on the obtained reference density correction value and gray balance correction value, so that gray balance or color shift can be easily measured, and furthermore, with the accuracy desired by the user. A color adjustment method to be adjusted can be established.

As another mode for obtaining the reference density correction value,
There is also a method of comparing a first primary color chart output by an image recording apparatus and obtained by changing gradation data of a first primary color with a first primary color reference chart in which the first primary color has a constant density. No.

As for the skin color, the skin color reference chart corresponding to the reference density correction value obtained as described above and the gradation data of the first primary color output from the image recording apparatus are fixed, and the It is obtained by comparing with a chart obtained by changing the gradation data of the second and third primary colors, respectively.

Preferred embodiments of the present invention include the following. The first primary color reference chart is created by gradation data in which gradation data is continuously changed, and the first primary color chart obtained by changing the gradation data of the first primary color is gradation. The fact that the data is created with gradation data in which the data is continuously changed makes it possible to read the numerical values between the γ increments, and it is possible to perform more precise adjustment using one type of chart. It is also preferable to create a chart using gradation data in which the gradation data of the second and third primary colors are continuously changed, since the same effect as described above tends to be obtained. If the three primary colors in the color adjustment method are yellow, magenta, and cyan, and the first primary color is magenta, it is preferable as a color for density adjustment because the visibility is highest.・ The gray balance of the gray reference chart is a ^* =-5
In the range of +5 and b ^* =-5 to 0, the image is not blurred even if the gray tint slightly changes, which is preferable. If the density of the gray reference chart is in the range of L value = 45 to 85 or density value of 0.2 to 1.0, it is possible to find a correction value in a density region with high luminosity, so that the accuracy is high. Become.・ If a dummy image is placed at the beginning of the chart image that determines the correction value, the thermal head will be in a steady heat storage state and the image at the beginning of the print will not be used for color adjustment. Can be increased.

[0037]

Embodiments of the present invention will be specifically described below with reference to the drawings.

Embodiment 1 Here, yellow (hereinafter, referred to as Y) and magenta (hereinafter, referred to as Y)
A specific example of a sublimation thermal transfer printer using three primary color inks of M) and cyan (hereinafter C) will be described. <Sublimation thermal transfer printer> By using a gradation table for associating input data and output density set in the sublimation thermal transfer printer, for each of Y, M, and C colors, a 256 It is set so that an image is formed. Printing is performed in the order of Y, M, and C planes to create an image. The printing density is 300 dpi × 300 dpi.
In addition, dpi represents the number of dots per 2.54 cm. <Preparation of Reference Chart> A reference chart is prepared in advance by the product developer / device provider and passed to the user. The reference chart is a colorimeter which confirms that the color tone and density of the chart are set values.

FIG. 1 shows an example of the reference chart. M in FIG. 1 is an image corresponding to 135 gradations of input data when γ is changed every 0.1 around 1.0, and GRAY is gray around γ around 1.0. ,
This is an image corresponding to 135 gradations of input data when changed every 0.1. By adjusting the printer, gray γ =
The L value at 1.0 is set to 55, and the color tone is set to a ^* = 0 and b ^* =-2. The reference chart may be created by any method as long as it meets the specifications. However, based on the colors of the Y, M, and C primary colors, it is recommended to use a printer with the same specifications as the printer to be adjusted using the reference tool. preferable. It is also possible to prepare a plurality of types of γ steps from coarse to fine, and use them in accordance with the adjustment request accuracy of the user. The step width of γ may be uniform, may be fine near 1.0, and may increase with distance. The index of the patch is also an example, and +1 is often used for the density of a photograph instead of γ.
Or the like, and may be adjusted to the system to be used (the configuration of the recording unit). The reciprocal of the γ value at the time of printing is assigned as the memory allocation method in the reference chart. As the numerical values of both M and GRAY in FIG. 1 increase, the density decreases.

In photographs, human skin color is the most important subject. The density of Japanese face is 0.2-1.0 (L = 45
To 85). Further, the density is a region where the human visibility is the highest, and it can be adjusted most accurately by adjusting the density in the vicinity thereof. It is preferable that gray has no color, but when Y, M, and C are superimposed to make gray, it is difficult to eliminate color at all densities, and gray color has a large effect on image impression. give. If the gray takes on a yellow tint, the image looks blurred. To prevent this, the gray of the intermediate density may be set in the b ^* <0 region, so that the gray of any density takes on the yellow tint. Can be prevented. <Creation of chart> The chart is output when adjusting the density and gray balance of the printer when purchasing the printer or replacing the material. FIG. 2 shows an example of the chart. FIG. 2 is an example of a color matrix chart,
The chart data in this figure is provided to the user who uses the printer together with the reference chart.

In FIG. 2, the area A has a fixed density of M (input gradation 135) on a recording medium such as recording paper, and the density of Y and C is 0.1 pitch with γ each being 0.1 pitch. It was created with a number of changing patches. That is, M
= Fixed density, C = density change, Y = density change, and
The density change rate is represented by using γ, and M = 1, and the density change rate of C and Y = 0.1 pitch. As for how to allocate the memory in the chart, the value of γ at the time of printing is allocated as it is. As the value of γ of Y increases, the density of Y increases.
The actual coloring of each patch by Y, M, and C is omitted in the figure. Further, if the patches are adjacent to each other, the eye measurement becomes inaccurate due to the Mach phenomenon (or edge effect). Therefore, it is preferable to provide a grid so as to divide each patch.

As the color of the lattice, a gray intermediate density or the like is preferable for discriminating the color. Furthermore, by selecting a color that is close to the color of the chart, flare is reduced, so that an accurate color can be determined. The approximate range is preferably 10 or less in lightness.

In FIG. 2, a region B is an M input gradation 13
5 is output, and area C is a solid black area. The area C corresponds to the print head of the printer. In a thermal transfer printer, heat accumulates as printing continues on a thermal head, and the density of the same data varies. Although heat storage control is performed to prevent this, it is difficult to control the heat storage particularly at the start of printing, and the density may fluctuate greatly only at the print head. Therefore, by installing a dummy image at the head as in the area C, it is possible to keep the image in the steady heat storage state and not to use the image at the head of the print for color adjustment, thereby improving the adjustment accuracy. It becomes possible.

In the area A, the density change rates in the vertical and horizontal directions may be equal or different. Furthermore, the index of the patch used here is also an example, and may be +1 instead of γ, which is often used for the density of a photograph, etc., and may be adjusted according to the system used (the configuration of the recording unit). In addition, the position of the marker is set beside the patch, but this is not a limitation.
Note that, here, the case where Y, M, and C are used as recording colors is used, but the case where Y, M, and C are used as R, G, and B recording colors on photographic paper or the like can be similarly applied.

In FIG. 2, M is fixed in density, but other colors may be fixed in density. However, M is preferred as a color for density adjustment because M has the highest visibility. In the gray tint adjustment, the gray balance can be adjusted with high accuracy by fixing the highest sensitivity M and changing the low visibility Y and C to adjust.

In the embodiment of the present invention, a plurality of charts are formed by dividing a step width (for example, a density change rate) into a plurality of stages, and a color matrix chart having a coarse step width (a large density change rate) is used. It is also possible to increase the accuracy of the final adjustment by making a coarse adjustment and then making a fine adjustment by reducing the step size of the chart (decreasing the density change rate). <Density correction: gray balance adjustment> ((γ: YMC), (γ: YMC)
A mechanism for feeding back the three numerical values of (Y) and (γ: C)) will be specifically described based on an image processing apparatus including a printer.

First, a color tone correction program as application software or an image processing apparatus in which a printer driver is operating displays a screen as shown in FIG. 3 on the display device for color tone correction. As an example, various settings can be made on this screen shown in FIG. 3, but gray balance adjustment proceeds by selecting and clicking “gray calibration” in the portion.

When "gray calibration" is selected and clicked on the screen of FIG. 3, the image processing apparatus displays a "gray balance calibration utility" screen as shown in FIG. In this case, the user inputs the parameters of the gray scale (CMY) and the color scale (Cy, Mg, Ye) into the parameter registration unit (the parameter input unit in FIG. 4) by reading the index of the color matrix chart. Set the output tone curve of the printer driver ((γ:
CMY), (γ: C), (γ: M), (γ: Y)).

Γ: CMY is a coefficient for changing the contrast. γ: C, γ: M, and γ: Y are power functions for controlling the gradation characteristics of cyan, magenta, and yellow, respectively.

There is also a method in which the user selects a corresponding numerical value from a pull-down menu and inputs the numerical value instead of inputting the numerical value. <Procedure for Adjusting Density and Gray Balance> 1) From the M uniform data of the output chart and the M of each γ value of the reference chart, one having the same density is visually found, and the γ value is recorded ( γ: YMC). 2) Among the matrix patches in which M and Y and C of the output chart are fixed and Y and C are changed, the same color as the gray of γ value found in 1) in the gray patch of the reference chart as described above. A patch is visually found, and the Y and C γ values corresponding to the patch are recorded (γ: Y, γ: C). 3) Gray scale (γ: CMY) and color scale (γ: C) are stored in the parameter registration section on the screen of the “gray balance calibration utility” of the printer driver.
y) and (γ: Ye) are input. <Reference gray value and gray adjustment result> Reference gray a ^*
/ B ^* is (0/0), (5> a ^* > − 5, and 0>b> −
5), (absolute values of a ^* and b ^* of 5 or more), and the adjusted gray value and image quality of each numerical value are shown below. A ^* / b ^* = 0/0 (hue is set to 0 at L = 55): Gray varied in b ^* > 0 in highlight. The gray color itself does not give the impression of being colored, but the overall image looks less sharp. A ^* / b ^* = 5> a ^* >-5 and 0>b> -5: The gray color does not appear to be colored. The image quality is also good. Absolute values of a ^* and b ^* of 5 or more: Although there is no problem in the sharpness of the image, it can be seen that gray is tinted.

Embodiment 2 Next, an embodiment in which a reference chart and a matrix patch of the chart are created using gradation data will be described.

FIG. 5 shows an example of the reference chart. M and GRAY in FIG. 5 are the same as in FIG. That is, it is created on a recording medium such as recording paper by a plurality of patches in which the densities of M and GRAY each change γ at 0.1 pitch. As M = density change, GRAY = density change, an index of the density change rate is expressed using γ, and the density change rate = 0.1 pitch. Here, the M and GRAY regions are characterized in that one patch is not the same data but a gradation in which the data continuously varies. The actual coloring of each patch by M and GRAY is omitted.

FIG. 6 shows a chart. FIG. 6 shows one of the color matrix charts obtained by the embodiment of the present invention.
This is an example, and the color matrix chart in FIG. 6 is the same as that in FIG. 2, and the region C is omitted. That is, the color matrix chart is printed on a recording medium such as a recording paper.
Are fixed and the density of Y and C is formed by a plurality of patches in which γ changes at a pitch of 0.1. M = fixed density, C = density change, Y = density change, and the density change rate is expressed using γ, M = 1, C
And the density change rate of Y = 0.1 pitch. Here, only one area of the color matrix chart is characterized in that one patch is not the same data but has a gradation in which data continuously varies. The coloring of each patch by the actual YMC is omitted.

Since the patch is made of gradation data, it is possible to read a numerical value between the step values of γ, and it is possible to perform adjustment with higher accuracy by using one type of chart.

Embodiment 3 Next, an embodiment in which M of the reference chart has a uniform density and M of the chart is formed by gradation data will be described.

FIG. 7 shows an example of the reference chart. M and GRAY in FIG. 7 are the same as in FIG. 1, except that the reference chart is formed with the density of M fixed. In other words, the density of GRAY is created by a patch in which the density of γ changes at a pitch of 0.1 while the density of M is fixed. M = fixed density, GRAY = change in density,
The density change rate is represented by using γ, and M = 1 and the GRAY density change rate = 0.1 pitch.

FIG. 8 shows a chart. The color matrix chart in FIG. 8 is the same as that in FIG.
Each of the M and C densities is created by a plurality of patches in which γ changes at a pitch of 0.1. That is, M = density change, C = density change, Y = density change, and an index of the density change rate is represented by using γ, and the density change rate is set to 0.1 pitch. Here, the region C is omitted.

Adjustment of density and gray balance in this embodiment is performed in the following procedure. 1) A data image having a uniform M density of the reference chart is compared with an M data image of the output chart in which γ has been changed by 0.1 to find visually the same density, and record the γ value. (Γ: YMC). 2) From among the matrix patches in which the M density of the output chart is fixed and the Y and C densities are changed, patches of the same color as the gray of the γ value found in 1) are visually observed among the gray patches of the reference chart. , And corresponding to that patch,
The γ values of Y and C are recorded (γ: Y, γ: C). 3) Then, the screen of the printer driver's “Gray Balance Calibration Utility” is registered in the parameter registration section with gray scale (γ: CMY) and color scale (γ: C).
y) and (γ: Ye) are input.

Embodiment 4 Next, an embodiment in which the density setting color of the reference chart is formed in green (G) will be described.

FIG. 9 shows a reference chart, and FIG. 10 shows a chart (color matrix chart). 9 and 10
In the reference chart and the chart of, the first primary color is M
Is used to change the image from which the density adjustment γ value is derived to green instead of M, the gray balance adjustment image is formed in the same manner as in Embodiment 1, and the adjustment procedure is the same as in a series of FIGS. And Here, the color for density setting of the reference chart is green as the first primary color, but color adjustment of the image recording apparatus may be performed by adopting another primary color. In FIG. 10, the region C is omitted.

Embodiment 5 An embodiment in which the density is set to M and the colors of the chart and the reference chart are created in flesh color will be described.

FIG. 11 shows a reference chart, and FIG. 12 shows a chart (color matrix chart). FIG. 12 shows a chart for adjusting the flesh color instead of adjusting the gray balance by changing the mixture amount of Y, M, and C from the first embodiment.
In FIG. 12, the region C is omitted. As in the first embodiment, the matrix density is fixed from the reference value, and Y and C are varied to form a matrix chart group.

For example, in the ID photo, the face image is mostly occupied by the subject, so that it is better to adjust the printer's color balance with the reference skin color to emphasize the skin color than to emphasize the gray balance, rather than to emphasize the gray balance. Can be better. The γ correction value may be output in combination with a gray reference chart.

[0064]

According to the present invention, the user of the image output device can measure the initial setting and the deterioration over time of the image output device, the gray balance or the color shift due to the replacement of the ink sheet, the toner and the image receiving paper. This provides a remarkably excellent effect that it is possible to realize a color tone correction method that can be adjusted by simple visual measurement without using an input device and with the accuracy desired by the user.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a reference chart.

FIG. 2 is an explanatory diagram illustrating an example of a color matrix chart.

FIG. 3 is an explanatory diagram illustrating an example of a color tone correction screen.

FIG. 4 is an explanatory diagram showing an example of a screen of a gray balance calibration utility.

FIG. 5 is an explanatory diagram showing an example of a reference chart.

FIG. 6 is an explanatory diagram showing an example of a color matrix chart.

FIG. 7 is an explanatory diagram showing an example of a reference chart.

FIG. 8 is an explanatory diagram showing an example of a color matrix chart.

FIG. 9 is an explanatory diagram showing an example of a reference chart.

FIG. 10 is an explanatory diagram showing an example of a color matrix chart.

FIG. 11 is an explanatory diagram showing an example of a reference chart.

FIG. 12 is an explanatory diagram illustrating an example of a color matrix chart.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yusuke Dobu 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation F-term (reference) 2C262 AA24 AA26 AB11 AB17 BB36 DA13 FA13 5B057 AA11 BA02 BA25 CA01 CA08 CA12 CA16 CB01 CB07 CB12 CB16 CE14 CE17 CE18 CH08 CH18 5C077 LL01 LL17 MM27 MP08 PP15 PP33 PP36 PP37 PQ08 TT04 5C079 HB02 LA02 LA12 LA23 LA31 LB01 MA10 MA11 NA03 NA05 NA27 PA02 PA03

Claims (10)

[Claims] 1. A first primary color chart obtained by an image recording apparatus using predetermined gradation data of a first primary color;
A chart obtained by fixing the gradation data of the first primary color and changing the gradation data of the second and third primary colors is output, and the first primary color chart and the first primary color are output. A reference density correction value is obtained by comparing the first primary color reference chart with the density of the first primary color changed, and a gray reference chart corresponding to the obtained reference density correction value, and gradation data of the first primary color. While fixing
A gray balance correction value is obtained by comparing with a chart obtained by changing the gradation data of the second and third primary colors, respectively, and based on the obtained reference density correction value and gray balance correction value, A color adjustment method comprising performing color adjustment of an image recording apparatus. 2. A first primary color chart obtained by an image recording apparatus using predetermined gradation data of a first primary color;
A chart obtained by fixing the gradation data of the first primary color and changing the gradation data of the second and third primary colors is output, and the first primary color chart and the first primary color are output. A reference density correction value is obtained by comparing the first primary color reference chart with the density changed, and a skin color reference chart corresponding to the obtained reference density correction value, and gradation data of the first primary color. While fixing
A skin color correction value is obtained by comparing a chart obtained by changing the gradation data of the second and third primary colors, respectively, and the image recording is performed based on the obtained reference density correction value and the obtained skin color correction value. A color adjustment method comprising performing color adjustment of a device. 3. A first primary color chart obtained by changing gradation data of a first primary color and gradation data of a first primary color by an image recording apparatus, and second and third gradation charts of the first primary color are fixed. Outputting a chart obtained by changing each of the gradation data of the primary colors, the first primary color chart;
A reference density correction value is obtained by comparing the first primary color with a first primary color reference chart having a constant density, and a gray reference chart corresponding to the obtained reference density correction value, and a first reference color of the first primary color. While fixing the gradation data, a gray balance correction value is obtained by comparing with a chart obtained by changing the gradation data of the second and third primary colors, respectively. A color adjustment method, wherein the color adjustment of the image recording apparatus is performed based on a gray balance correction value. 4. The color adjustment method according to claim 1, wherein the first primary color reference chart is created by gradation data in which gradation data is continuously changed. 5. A method according to claim 3, wherein the first primary color chart obtained by changing the gradation data of the first primary color is created by gradation data in which the gradation data is continuously changed. The color adjustment method described. 6. A chart in which gradation data of the first primary color is fixed and gradation data obtained by continuously changing gradation data of the second and third primary colors is created. The color adjustment method according to any one of claims 1 to 5. 7. The color adjusting method according to claim 1, wherein the three primary colors are yellow, magenta, and cyan, and the first primary color is magenta. 8. The color according to claim 1, wherein a gray balance of the gray reference chart is in a range of a ^* = − 5 to +5 and b ^* = − 5 to 0. Adjustment method. 9. The density of the gray reference chart is L value = 4.
9. The color adjusting method according to claim 1, wherein the color adjusting value is in a range of 5 to 85 or a density value of 0.2 to 1.0. 10. The color adjustment method according to claim 1, wherein a dummy image is provided at a leading portion of a chart image for determining a correction value.