JP2024110096A - Image processing device, printing system, and image processing program - Google Patents

Abstract

To provide a technique that allows printed matter to be expressed while minimizing the difference in appearance from actual printed matter.SOLUTION: An image processing device is provided, comprising: an image data acquisition unit for acquiring image data; a printing condition acquisition unit for acquiring printing conditions including the type of medium used for printing an image; a color conversion unit for applying color conversion to the image data according to the printing conditions; a parameter acquisition unit for acquiring medium parameters indicative of properties of the printing medium, including a translucency parameter indicative of translucency of the printing medium and a permeability parameter indicative of permeability of the printing medium; and a rendering unit configured to perform rendering using a 3D object representing the shape of the printing medium, the color-converted image data, the translucency parameter, and the permeability parameter.SELECTED DRAWING: Figure 3

Description

This disclosure relates to an image processing device, a printing system, and an image processing program.

The transmission of light can cause a phenomenon known as show-through, where an image printed on a print medium can be seen through the surface behind the printed surface. Regarding show-through, Patent Document 1 discloses a technology that generates a see-through image that represents the state of a T-shirt with an image printed on the front side as viewed from the back side, and displays the see-through image on a display.

JP 2006-093923 A

In printed matter, not only does the ink show through, but the ink may penetrate the printing medium, resulting in a phenomenon known as "show-through," in which the image printed on the printing medium is transferred to the surface behind the printed surface. The technology in Patent Document 1 can generate a see-through image that shows through, but does not show through, so there is a large difference in appearance between the printed matter shown in the see-through image and the actual printed matter. Therefore, there is a demand for technology that can express printed matter while minimizing the difference in appearance from the actual printed matter.

According to a first aspect of the present disclosure, an image processing device is provided. The image processing device includes an image data acquisition unit that acquires image data, a printing condition acquisition unit that acquires printing conditions including the type of printing medium on which an image is to be printed, a color conversion unit that performs color conversion on the image data according to the printing conditions, a parameter acquisition unit that acquires medium parameters that represent the properties of the printing medium, the medium parameters including a translucency parameter that represents the translucency of the printing medium and a permeability parameter that represents the permeability of the printing medium, and a rendering unit that performs rendering using a 3D object that represents the shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameter, and the permeability parameter.

According to a second aspect of the present disclosure, a printing system is provided. The printing system includes a display device that displays a rendering result generated by the image processing device, and a printing device that prints the image on the print medium.

According to a third aspect of the present disclosure, an image processing program is provided. This image processing program causes a computer to execute an image data acquisition function for acquiring image data, a printing condition acquisition function for acquiring printing conditions including the type of printing medium on which an image is to be printed, a color conversion function for performing color conversion on the image data according to the printing conditions, a parameter acquisition function for acquiring medium parameters that represent the properties of the printing medium, the medium parameters including a translucency parameter that represents the translucency of the printing medium and a permeability parameter that represents the permeability of the printing medium, and a rendering function for performing rendering using a 3D object that represents the shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameter, and the permeability parameter.

FIG. 1 is an explanatory diagram showing the configuration of a printing system according to a first embodiment. FIG. 1 is an explanatory diagram showing the configuration of an image processing apparatus according to a first embodiment. FIG. 2 is an explanatory diagram showing the configuration of a rendering unit according to the first embodiment. FIG. 1 is an explanatory diagram showing an example of a print medium on which an image is printed by single-sided printing. FIG. 1 is an explanatory diagram showing an example of a print medium on which an image is printed by double-sided printing. FIG. 2 is an explanatory diagram showing a first example of a user interface for inputting image data. FIG. 11 is an explanatory diagram showing a second example of a user interface for inputting image data. 11 is a flowchart showing the contents of a back-bleeding degree calculation process. FIG. 13 is an explanatory diagram showing an example of a pixel value penetration table. FIG. 13 is an explanatory diagram showing an example of a media permeability table. FIG. 11 is an explanatory diagram illustrating a state in which print-through image data is generated during single-sided printing. FIG. 11 is an explanatory diagram illustrating a state in which print-through image data is generated during double-sided printing. 10 is a flowchart showing the contents of a transparency calculation process in the case of a print image. FIG. 13 is an explanatory diagram showing an example of a medium permeability table. FIG. 4 is a diagram illustrating an example of an ink amount table. FIG. 4 is a diagram illustrating an example of an ink transmittance table. 11 is a flowchart showing the contents of a transparency calculation process in the case of a ready-made image. FIG. 13 is an explanatory diagram showing an example of an existing portion transmittance table. 11 is a flowchart showing the contents of a pixel color determination process. FIG. 1 is an explanatory diagram illustrating a schematic view of observing the surface of a 3D object. FIG. 11 is an explanatory diagram illustrating a rendering result displayed during surface observation. FIG. 1 is an explanatory diagram illustrating a schematic view of the rear surface of a 3D object. FIG. 11 is an explanatory diagram illustrating a rendering result displayed when observing the back surface. FIG. 11 is an explanatory diagram showing the configuration of an image processing apparatus according to a second embodiment. FIG. 13 is an explanatory diagram showing the effect of applying the influence data according to the third embodiment. FIG. 11 is an explanatory diagram showing a correction coefficient according to a material texture.

A. First embodiment:
1 is an explanatory diagram showing the configuration of a printing system 10 including an image processing device 100 according to a first embodiment. The printing system 10 includes the image processing device 100, an input device 200, a display device 300, and a printing device 400. The image processing device 100 generates a rendering image representing a printing medium on which an image is printed by physically based rendering (hereinafter, simply referred to as rendering), and displays the rendering image on the display device 300. The printing medium is, for example, printing paper such as plain paper, glossy paper, or matte paper. The printing medium is not limited to printing paper, and may be, for example, cloth. A printing medium having different textures on the front and back sides may be used, or a printing medium having the same texture on the front and back sides may be used.

The image processing device 100 includes a processor 101, a memory 102, an input/output interface 103, and an internal bus 104. The processor 101, the memory 102, and the input/output interface 103 are connected via the internal bus 104 to enable bidirectional communication. The input device 200, the display device 300, and the printing device 400 are connected to the input/output interface 103 of the image processing device 100 by wired or wireless communication. The input device 200 is, for example, a keyboard or a mouse, and the display device 300 is, for example, a liquid crystal display. The input device 200 and the display device 300 may be integrated as a touch panel. The printing device 400 is, for example, an inkjet printer, which prints an image on a printing medium.

FIG. 2 is an explanatory diagram showing the configuration of the image processing device 100 of the first embodiment. In this embodiment, the image processing device 100 includes an image data acquisition unit 110, a printing condition acquisition unit 120, an input profile acquisition unit 131, a media profile acquisition unit 132, a common color space profile acquisition unit 133, a color management system 140, a parameter acquisition unit 150, a degree of bleed-through calculation unit 160, a bleed-through image data generation unit 170, and a rendering unit 180. The image data acquisition unit 110, the printing condition acquisition unit 120, the profile acquisition units 131 to 133, the color management system 140, the parameter acquisition unit 150, the degree of bleed-through calculation unit 160, the bleed-through image data generation unit 170, and the rendering unit 180 are realized in software by the processor 101 executing the image processing program PG stored in advance in the memory 102. The color management system 140 may be referred to as a color conversion unit 140.

The image data acquisition unit 110 acquires image data. In this embodiment, the image data includes front image data and back image data. The front image data is image data representing an image printed on the front side of the print medium. The back image data is image data representing an image printed on the back side of the print medium, or an image such as a logo that is pre-formed on the back side of the print medium. If a logo or the like is not present on the back side of the print medium, the back image data may be an image representing the color of the lining of the print medium. In the following description, the image printed on the print medium is referred to as a printed image, the image pre-formed on the print medium is referred to as a pre-formed image, and when describing without making a particular distinction between a printed image and a pre-formed image, they are simply referred to as images. In addition, the image represented in the front image data may be referred to as a front image, and the image represented in the back image data may be referred to as a back image. The image data acquired by the image data acquisition unit 110 is transmitted to the color management system 140.

The printing condition acquisition unit 120 acquires printing conditions including the type of printing medium. In addition to the type of printing medium, the printing conditions include, for example, the printing method, the type of printing device, the type of ink, the amount of ink, the printing resolution, and whether to print in single-sided or double-sided printing. The printing conditions acquired by the printing condition acquisition unit 120 are sent to each of the profile acquisition units 131 to 133, the color management system 140, the parameter acquisition unit 150, the bleed-through degree calculation unit 160, the bleed-through image data generation unit 170, and the rendering unit 180.

The input profile acquisition unit 131 acquires an input profile which is an ICC profile used for color conversion from a device-dependent color space to a device-independent color space. The device-dependent color space is, for example, an RGB color space. The device-independent color space is, for example, an L ^* a ^* b ^* (hereinafter, simply referred to as Lab) color space or an XYZ color space. The media profile acquisition unit 132 acquires a media profile which is an ICC profile used for color conversion from a device-independent color space to a device-dependent color space for printing. The device-dependent color space for printing is, for example, a CMYK color space. The common color space profile acquisition unit 133 acquires a common color space profile which is an ICC profile used for color conversion from a device-independent color space to a color space for rendering. The color space for rendering is, for example, sRGB, AdobeRGB, Display-P3, or the like. Each of the profile acquisition units 131 to 133 acquires a profile that is pre-stored in the memory 102. Each of the profiles acquired by each of the profile acquisition units 131 to 133 is transmitted to the color management system 140. Note that each of the profile acquisition units 131 to 133 may acquire each profile from an external server via a network, for example.

The color management system 140 performs color conversion according to the printing conditions on the image data of the print image in the following order: color conversion to a device-independent color space using an input profile, color conversion to a device-dependent color space for printing using a media profile, color conversion to a device-independent color space using a media profile, and color conversion to a color space for rendering using a common color space profile. By performing color conversion to a color space dependent on the printing device, the color values of the image data are kept within a range that can be expressed by printing, and then, by performing color conversion to a color space for rendering, the color values of the image data that are kept within a range that can be expressed by printing are kept within a range that can be expressed by rendering. In this embodiment, the color management system 140 performs color conversion on the image data of the existing image in the following order: color conversion to a device-independent color space using an input profile, and color conversion to a color space for rendering using a common color space profile. In other words, the color management system 140 does not perform color conversion using a media profile on the image data representing the existing image. In addition, if the color space of the image data of the existing image is originally the same as the color space for rendering, the image data of the existing image does not need to be color converted by the color management system 140. In the following description, image data that has been color converted to the color space for rendering through color conversion using a media profile is called managed image data, image data that has been color converted to the color space for rendering without color conversion using a media profile, and image data that has not been color converted by the color management system 140 and whose color space is the same as the color space for rendering are called original image data, and when there is no particular distinction between managed image data and original image data, they are simply called image data. The managed image data and original image data are sent to the rendering unit 180. In addition, the color space before color conversion using the input profile is sometimes called the first color space, the color space dependent on the printing device is sometimes called the second color space, and the color space for rendering is sometimes called the third color space.

The parameter acquisition unit 150 acquires various parameters used in rendering. The parameter acquisition unit 150 acquires various parameters that are pre-stored in the memory 102. The various parameters acquired by the parameter acquisition unit 150 are transmitted to the rendering unit 180. Note that the parameter acquisition unit 150 may acquire the various parameters from an external server via a network, for example.

The various parameters used in rendering include, for example, 3D object information, camera information, lighting information, and medium parameters. The 3D object information is a parameter related to a 3D object arranged in a virtual space. The 3D object is created in advance by simulating the shape of the print medium. The 3D object is composed of a plurality of polygons. In this embodiment, the 3D object is configured in a plate shape with no thickness. The surface of the 3D object is composed of the surface of each polygon, and the back surface of the 3D object is composed of the back surface of each polygon. Here, the surface of the polygon is the surface on the side to which the normal vector of the polygon faces, the surface of the 3D object is the surface corresponding to the surface of the print medium, and the back surface of the 3D object is the surface corresponding to the back surface of the print medium. The camera information is a parameter related to the position and orientation of a camera arranged in a virtual space. The lighting information is a parameter related to the type, position, orientation, color, and luminosity (amount of light) of a light source arranged in a virtual space. The type of light source includes, for example, a fluorescent lamp and an incandescent light bulb. The various parameters used in rendering may include background color information, which is a parameter related to the background color of the 3D object.

The medium parameters are parameters that represent the properties of the printing medium. In this embodiment, the medium parameters include a texture parameter that represents the texture of the printing medium, a permeability parameter that represents the permeability of the printing medium, and a translucency parameter that represents the translucency of the printing medium. The texture parameters include a surface texture parameter and a back surface texture parameter. The surface texture parameter is a texture parameter that represents the texture of the surface of the printing medium, and the back surface texture parameter is a texture parameter that represents the texture of the back surface of the printing medium. When a printing medium having different textures on the surface and back surface is used, the contents of the surface texture parameter and the back surface texture parameter are at least partially different from each other. When a printing medium having the same texture on the surface and back surface is used, it is preferable that the contents of the surface texture parameter and the back surface texture parameter are the same. In this case, the surface texture parameter and the back surface texture parameter may be bundled together rather than being separate.

Each texture parameter includes, for example, a base color (Base Color) related to the background color of the print medium, the smoothness (Smoothness) of the print medium, the metallicity (Metallic) of the print medium, a normal map (Normal Map), a height map (Height Map), and the like. High metallicity makes it easier for the surrounding scenery to be reflected on the print medium. Each texture parameter may include the roughness (Roughness) of the print medium instead of the smoothness of the print medium. The normal map and the height map are used to express the minute unevenness (microfacets) of the print medium that affect the reflection of light. The normal map is a texture that represents the distribution of the normal vector of the minute unevenness surface, and the height map is a texture that represents the distribution of the height of the minute unevenness surface. If the size of the polygons that make up the 3D object is reduced to express the minute unevenness, the number of polygons becomes enormous, and the calculation load of the rendering becomes large. By using normal maps and height maps, it is possible to express the effect on light reflection caused by minute unevenness on the surface without reducing the size of the polygons.

In this embodiment, the translucency parameters include a medium transmittance, which represents the light transmittance (transparency) of the print medium. Note that the translucency parameters may also include a medium opacity, which represents the light opacity (opacity) of the print medium, or may include a correction coefficient for the medium transmittance or medium opacity.

The penetration parameters include a surface penetration parameter and a back penetration parameter. Each penetration parameter includes a media penetration degree that represents the penetration degree of the ink into the printing medium, which depends on the properties of the printing medium. The media penetration degree of the surface penetration parameter represents the penetration degree of the ink from the front surface to the back surface of the printing medium, and the media penetration degree of the back penetration parameter represents the penetration degree of the ink from the back surface to the front surface of the printing medium. When a printing medium is used in which the penetration degree of the ink from the front surface to the back surface and the penetration degree of the ink from the back surface to the front surface are different, the contents of the surface penetration parameter and the back penetration parameter are different from each other. When a printing medium is used in which the penetration degree of the ink from the front surface to the back surface and the penetration degree of the ink from the back surface to the front surface are the same, it is preferable that the contents of the surface penetration parameter and the back penetration parameter are the same. In this case, the surface penetration parameter and the back penetration parameter may be bundled together rather than being separate. Each penetration parameter is transmitted to the strike-through degree calculation unit 160.

The print-through degree calculation unit 160 uses the penetration parameters to calculate the print-through degree for generating print-through image data. Print-through means that the image printed on the printed surface can be seen from the reverse side as a result of ink penetrating from the printed surface to the reverse side of the printed surface. The print-through degree refers to the degree of print-through. The method for calculating the print-through degree will be described in detail later. The print-through degree is sent to the print-through image data generation unit 170.

The print-through image data generating unit 170 uses the image data and the degree of print-through to generate print-through image data representing a print-through image formed on the print medium by print-through. In this embodiment, in the case of single-sided printing, the print-through image data generating unit 170 generates print-through image data of the print-through image formed on the back side by combining the managed image data of the print image on the front side with the original image data of the existing image on the back side according to the degree of print-through. In the case of double-sided printing, the print-through image data generating unit 170 generates print-through image data of the print image on the back side by combining the managed image data of the print image on the front side with the managed image data of the print image on the back side according to the degree of print-through, and generates print-through image data of the print image on the front side by combining the managed image data of the print image for the back side with the managed image data of the print image on the front side according to the degree of print-through. In the following description, the print-through image data of the print-through image formed on the front side of the print medium is referred to as print-through front image data, the print-through image data of the print-through image formed on the back side of the print medium is referred to as print-through back image data, and when there is no particular distinction between print-through front image data and print-through back image data, the print-through image data is simply referred to as print-through image data. When there is no particular distinction between print-through image data, managed image data, and original image data, the print-through image data is simply referred to as image data. The print-through image data is sent to the rendering unit 180.

The rendering unit 180 generates a rendering image representing the print medium on which the image is printed by performing rendering using the image data and various parameters. In this embodiment, the rendering unit 180 performs rendering that takes into account the texture parameter, the penetration parameter, and the translucency parameter. Specifically, in the case of single-sided printing, the rendering unit 180 associates the managed image data of the print image on the front side and the surface texture parameter with the front side of the 3D object, and associates the back side texture parameter and the back side image data corresponding to the penetration parameter with the back side of the 3D object, and performs rendering according to the translucency parameter. In the case of double-sided printing, the rendering unit 180 associates the front side image data and the surface texture parameter corresponding to the penetration parameter with the front side of the 3D object, and associates the back side image data and the back side texture parameter corresponding to the penetration parameter with the back side of the 3D object, and performs rendering according to the translucency parameter.

Figure 3 is an explanatory diagram showing the configuration of the rendering unit 180. The rendering unit 180 includes a vertex pipeline VPL, a rasterizer RRZ, a pixel pipeline PPL, and a post-processing unit PST. In this embodiment, the vertex pipeline VPL includes a vertex shader VS and a geometry shader GS, and the pixel pipeline PPL includes a pixel shader PS, a transparency calculation unit TC, and a render backend RBE.

The vertex shader VS uses 3D object information, camera information, and lighting information to perform coordinate transformation of the vertices of each polygon constituting the 3D object, calculation of the normal vector of each polygon, shading processing, and calculation of texture mapping coordinates (UV coordinates). The coordinate transformation includes model transformation, which is a coordinate transformation from a local coordinate system (also called a model coordinate system) that is the coordinate system of the 3D object to a world coordinate system (also called a global coordinate system) that is the coordinate system of the virtual space, view transformation, which is a coordinate transformation from the world coordinate system to a view coordinate system (also called a camera coordinate system) that is the coordinate system of a camera arranged in the virtual space, and projection transformation, which is a coordinate transformation from the view coordinate system to a screen coordinate system (also called a clipping coordinate system) that is the coordinate system of the screen onto which the scene viewed from the camera is projected. Some of the above-mentioned coordinate transformations may be performed by the geometry shader GS. The processing result of the vertex shader VS is sent to the geometry shader GS.

The geometry shader GS processes a set of vertices of a 3D object. The geometry shader GS can convert polygons into points or lines, or convert points or lines into polygons, by increasing or decreasing the number of vertices. The processing result of the geometry shader GS is sent to the rasterizer RRZ. Note that in other embodiments, the rendering unit 180 does not need to be provided with a geometry shader GS. In this case, the processing result of the vertex shader VS is sent to the rasterizer RRZ.

The rasterizer RRZ executes rasterization processing to generate drawing information for each pixel from the processing results of the vertex pipeline VPL. The processing results of the rasterizer RRZ are sent to the pixel shader PS.

The pixel shader PS calculates the color of each pixel by performing a lighting process using the rasterized 3D object, image data, and medium parameters. In this embodiment, the transparency calculation unit TC is provided in the pixel shader PS. The transparency calculation unit TC calculates the transparency of the image on the printing medium using a translucency parameter that represents the translucency of the printing medium. The image printed on the printing surface is seen through the back surface of the printing surface due to the transmission of light, which is called see-through. The transparency of the image means the degree to which the image is seen through the back surface. The details of the calculation method of the transparency will be described later. In this embodiment, the surface of the 3D object is composed of the surfaces of each polygon, and the back surface of the 3D object is composed of the back surfaces of each polygon, so the pixel shader PS associates the surface image data and the surface texture parameter with the surface of each polygon, and associates the back image data and the back texture parameter with the back surface of each polygon, and performs a lighting process according to the transparency. For example, the Disney principle BRDF can be used as a function for calculating the reflection of light in the lighting process. In this embodiment, the rendering unit 180 has a back-face culling function that excludes polygons whose back faces face the camera from being drawn. When the rendering unit 180 has the back-face culling function, the rendering unit 180 executes processing with the back-face culling function turned off. Therefore, the back faces of each polygon within the field of view of the camera are not excluded from being drawn. The processing results of the pixel shader PS are sent to the render backend RBE.

The render backend RBE determines whether or not to write the pixel data generated by the pixel shader PS to the display area of the memory 102. If the render backend RBE determines to write to the memory 102, the pixel data is saved as a drawing target, and if the render backend RBE does not determine to write to the memory 102, the pixel data is not saved as a drawing target. For example, an alpha test, a depth test, a stencil test, or the like is used to determine whether or not to write. In this embodiment, the pixel data includes color information of the front surface of the polygon and color information of the back surface of the polygon. The render backend RBE writes the color of the polygon from the back side to the camera, for example, by a depth sorting method. After writing the color of the polygon on the back side, when writing the color of the polygon on the front side, the render backend RBE synthesizes the color of the polygon on the back side and the color of the polygon on the front side by, for example, alpha blending according to the transparency of the polygon on the front side. If the transparency is zero, the color of the polygon in the foreground overwrites the color of the polygon in the background when the color of the polygon in the foreground is written. The pipeline process ends when the pixel data is written to memory 102.

The post-processing unit PST performs post-processing such as anti-aliasing, ambient occlusion, screen space reflection, and depth of field processing on the rendered image consisting of pixel data stored in memory 102, thereby improving the appearance of the rendered image.

Figure 4 is an explanatory diagram showing an example of a print medium on which an image is printed by single-sided printing. Figure 5 is an explanatory diagram showing an example of a print medium on which an image is printed by double-sided printing. The upper part of Figures 4 and 5 shows a print image, and the lower part shows the print medium after printing. In the example of Figures 4 and 5, both sides of the print medium before printing are blank. As shown in Figure 4, when a print image is printed on the front side of a print medium, the print image printed on the front side may be visible from the back side due to bleed-through or show-through. As shown in Figure 5, when a print image is printed on both the front and back sides of a print medium, the print image printed on the front side may be visible from the back side due to bleed-through or show-through, and the print image printed on the back side may be visible from the front side. Note that the dot patterns in Figures 4 and 5 represent the minute unevenness and unevenness of the print medium.

Figure 6 is an explanatory diagram showing a first example of a user interface for inputting image data. The user interface UI1 in Figure 6 is displayed, for example, on the display device 300. The user interface UI1 is for single-sided printing. The user interface UI1 has one input area for inputting image data. The image data acquisition unit 110 acquires the image data of the print image input to the user interface UI1 as front image data, and acquires the image data of a ready-made image corresponding to the type of print medium as back image data.

FIG. 7 is an explanatory diagram showing a second example of a user interface for inputting image data. The user interface UI2 in FIG. 7 is displayed, for example, on the display device 300. The user interface UI2 can be used for both single-sided and double-sided printing. The user interface UI2 has two areas for inputting image data. The image data acquisition unit 110 acquires image data of an image input into the left area of the two areas as front image data, and acquires image data of an image input into the right area as back image data. Therefore, in the case of single-sided printing, image data of a print image to be printed on the front side of the print medium can be input through the left area, and image data of a pre-existing image formed on the back side of the print medium can be input through the right area. In the case of double-sided printing, image data of a print image to be printed on the front side of the print medium can be input through the left area, and image data of a print image to be printed on the back side of the print medium can be input through the right area.

Figure 8 is a flowchart showing the contents of the back-bleed degree calculation process for calculating the back-bleed degree. Figure 9 is an explanatory diagram showing an example of a pixel value penetration table TB1 used in the back-bleed degree calculation process. Figure 10 is an explanatory diagram showing an example of a medium penetration table TB2 used in the back-bleed degree calculation process. The back-bleed degree calculation process is executed by the back-bleed degree calculation unit 160 prior to rendering. When the back-bleed degree calculation process is started, first, in step S110, the back-bleed degree calculation unit 160 obtains image data that has been color converted to a color space dependent on the printing device from the color management system 140. In the case of single-sided printing, the back-bleed degree calculation unit 160 obtains front image data, and in the case of double-sided printing, obtains front image data and back image data.

Next, in step S120, the strike-through calculation unit 160 calculates the pixel value penetration degree for each pixel from the pixel value of each pixel of the image data. The pixel value penetration degree represents the penetration degree of ink into the printing medium, which depends on the pixel value. In this embodiment, the strike-through calculation unit 160 calculates the pixel value penetration degree using a pixel value penetration degree table TB1 pre-stored in the memory 102. As shown in FIG. 9, the pixel value penetration degree table TB1 represents the relationship between the pixel value and the pixel value penetration degree for each of R, G, and B, and the strike-through calculation unit 160 calculates the pixel value penetration degree for each of R, G, and B. In the pixel value penetration degree table TB1, the pixel values of 256 gradations are represented by values from 0 to 1. The pixel value penetration degree is represented by values from 0 to 1, and the larger the pixel value penetration degree value, the easier it is for the ink to penetrate into the printing medium.

In step S130, the print-through calculation unit 160 acquires the media permeability included in the permeation parameters. In this embodiment, the media permeability is represented in the media permeability table TB2 shown in FIG. 10. In the media permeability table, the media permeability of the front side and the media permeability of the back side of the print medium are each represented by a single scalar quantity. The media permeability is represented by a value between 0 and 1, and the higher the media permeability value, the easier the ink will permeate into the print medium.

In step S140, the print-through degree calculation unit 160 calculates the print-through degree for each pixel using the pixel value penetration degree and the medium penetration degree for each pixel. In this embodiment, the print-through degree calculation unit 160 calculates the print-through degree of the front side using the following formula (1A), and calculates the print-through degree of the back side using the following formula (1B). The print-through degree of the front side means the degree of print-through from the front side to the back side, and the print-through degree of the back side means the degree of print-through from the back side to the front side. The print-through degree is expressed by a value from 0 to 1. The print-through degree calculation unit 160 calculates the print-through degree for each of R, G, and B. After that, the print-through degree calculation unit 160 ends this process.
Surface strike-through rate=Surface pixel value permeability×Surface medium permeability (1A)
Back side strike-through rate=back side pixel value penetration rate×back side medium penetration rate (1B)

FIG. 11 is an explanatory diagram showing a schematic diagram of how the print-through image data is generated in single-sided printing. FIG. 12 is an explanatory diagram showing a schematic diagram of how the print-through image data is generated in double-sided printing. The print-through image data generating unit 170 generates print-through image data using the print-through degree for each pixel calculated by the print-through degree calculation process. The print-through image data generating unit 170 generates print-through back image data in the case of single-sided printing, and generates print-through back image data and print-through front image data in the case of double-sided printing. The print-through image data generating unit 170 calculates the pixel value of the print-through front image data using the following formula (2A), and calculates the pixel value of the print-through back image data using the following formula (2B). The print-through image data generating unit 170 calculates the pixel values of R, G, and B.
Pixel value of the front image of the show-through=1−((1−pixel value of the front image)+(1−pixel value of the back image)×degree of show-through on the back surface) (2A)
Pixel value of back side image of show-through=1−((1−pixel value of back side image)+(1−pixel value of front side image)×degree of show-through on front side) (2B)
Here, the pixel values of the print-through front image are the pixel values of the print-through front image data, the pixel values of the print-through back image are the pixel values of the print-through back image data, the pixel values of the front image are the pixel values of the managed image data of the front image, and the pixel values of the back image are the pixel values of the managed image data of the back image.

FIG. 13 is a flowchart showing the contents of the transparency calculation process when calculating the transparency of a printed image. FIG. 14 is an explanatory diagram showing an example of a media transparency table TB3. FIG. 15 is an explanatory diagram showing an example of an ink amount table TB4. FIG. 16 is an explanatory diagram showing an example of an ink transparency table TB5. The transparency calculation process is performed by the transparency calculation unit TC during rendering. When the transparency calculation process is started, first, in step S210, the transparency calculation unit TC acquires the media transparency representing the light transmittance of the print medium as a light transmission parameter. In this embodiment, the transparency calculation unit TC acquires the media transmittance using the media transmittance table TB3 pre-stored in the memory 102. As shown in FIG. 14, the media transmittance table TB3 shows the relationship between the type of print medium and the media transmittance. The media transmittance is expressed by a value from 0 to 1. When the media transmittance is 1, the print medium transmits all light, and when the media transmittance is 0, the print medium does not transmit any light. When media transparency is greater than 0 and less than 1, the print medium allows some light to pass through.

In step S220, the transparency calculation unit TC calculates the amount of ink according to the pixel values of the image data of the print image. In this embodiment, the transparency calculation unit TC calculates the amount of ink from the pixel values of the image data using an ink amount table TB4 that is pre-stored in memory 102. As shown in FIG. 15, the ink amount table TB4 shows the relationship between pixel values and ink amounts. The transparency calculation unit TC calculates the amount of ink for each pixel of the image data.

In step S230, the transmittance calculation unit TC calculates the ink transmittance, which represents the light transmittance of the ink. In this embodiment, the transmittance calculation unit TC calculates the ink transmittance from the ink amount using the ink transmittance table TB5 pre-stored in the memory 102. As shown in FIG. 16, the ink transmittance table TB5 shows the relationship between the ink amount and the ink transmittance. The ink transmittance is expressed as a value from 0 to 1. When the ink transmittance is 1, the ink passes all light, and when the ink transmittance is 0, the ink does not pass any light. When the ink transmittance is greater than 0 and less than 1, the ink passes some light. Since the light-blocking property of K ink is high, the ink transmittance is low in areas where the proportion of K ink in the ink supplied to the printing medium during printing is high. Since the light-blocking property of Y ink is low, the ink transmittance is high in areas where the proportion of Y ink in the ink supplied to the printing medium during printing is high. Since the light blocking properties of ink vary depending on the type of ink, an ink transmittance table TB5 for each type of ink is stored in advance in the memory 102. The transmittance calculation unit TC calculates the ink transmittance using the ink transmittance table TB5 that matches the printing conditions. The transmittance calculation unit TC calculates the ink transmittance for each pixel of the image data.

In step S240, the transmittance calculation unit TC calculates the transmittance of the print image on the print medium, taking into account the medium transmittance and the ink transmittance. In this embodiment, the transmittance calculation unit TC calculates the transmittance of the print image by the following formula (3A).
Transmittance = medium transmittance x ink transmittance (3A)
The transmittance calculation unit TC calculates the transmittance for each pixel of the image data. After that, the transmittance calculation unit TC ends this process. Note that, in calculating the transmittance of the print image, ink opacity, which indicates the opacity of ink to light, may be used instead of ink transmittance. Information related to the ink translucency, that is, ink transmittance, ink opacity, and correction coefficients for ink transmittance and ink opacity, may be referred to as ink translucency information.

Figure 17 is a flowchart showing the contents of the transparency calculation process when calculating the transparency of an existing image. Figure 18 is an explanatory diagram showing an example of an existing part transparency table TB6. When the transparency calculation process is started, first, in step S310, the transparency calculation unit TC acquires the medium transparency, similar to the transparency calculation process in the case of image data of a print image.

In step S320, the transparency calculation unit TC calculates the existing portion transparency, which represents the light transmittance of the area where the existing image is formed. In this embodiment, the transparency calculation unit TC calculates the existing portion transparency from the brightness of each pixel of the image data using an existing portion transparency table TB6 pre-stored in memory 102. As shown in FIG. 18, the existing portion transparency table TB6 represents the relationship between brightness and existing portion transparency. The existing portion transparency is represented by a value from 0 to 1. A pixel with an existing portion transparency of 1 passes all light, and a pixel with an existing portion transparency of 0 does not pass any light. A pixel with an existing portion transparency greater than 0 and less than 1 passes some light. The transparency calculation unit TC calculates the existing portion transparency for each pixel of the image data.

In step S330, the transparency calculation unit TC calculates the transparency of the existing image on the print medium, taking into account the medium transparency and the existing portion transparency. In this embodiment, the transparency calculation unit TC calculates the transparency of the existing image by the following formula (3B).
Transmittance = Medium permeability x Existing part transmittance ... (3B)
The transparency calculation unit TC calculates the transparency of each pixel of the image data. After that, the transparency calculation unit TC ends this process. In addition, in calculating the transparency of the existing image, the existing part opacity indicating the light opacity of the surface on which the existing image is formed may be calculated instead of the existing part transparency. Information on the translucency of the surface on which the existing image is formed, that is, the existing part transmittance, the existing part opacity, and the correction coefficient of the existing part transmittance and the existing part opacity, may be called existing part translucency information.

Figure 19 is a flowchart showing the contents of the pixel color determination process. The pixel color determination process is executed by the pixel shader PS when the rendering unit 180 generates a rendering image. When the pixel color determination process starts, the pixel shader PS acquires resource data for the front side in step S410, and acquires resource data for the back side in step S420. The front side resource data includes the pixel value of the front side image data corresponding to the part to be determined, the surface texture parameter, and the transparency of the front side image. The back side resource data includes the pixel value of the back side image data corresponding to the part to be determined, the back side texture parameter, and the transparency of the back side image. In step S430, the transparency calculation unit TC calculates the transparency by executing the transparency calculation process described above.

In step S440, the pixel shader PS performs a lighting process by taking into account the influence of the texture parameter and the influence of the transparency on the determination target portion, and determines the pixel color of the pixel of the rendering image. When rendering the front surface, the pixel shader PS can calculate the pixel value of the rendering image by the following formula (4A), and when rendering the back surface, the pixel value of the rendering image can be calculated by the following formula (4B). The following formulas (4A) and (4B) show a calculation method that does not rely on the physically based calculation in order to explain the effect of see-through. In practice, the pixel shader PS calculates the pixel value by the physically based calculation using a bidirectional reflectance distribution function (BRDF) or the like. The pixel shader PS calculates the pixel values of R, G, and B, respectively.
Pixel value of rendering image (at the time of front side rendering)=pixel value of front side image×(1−transparency of front side image)+pixel value of back side image×(1−transparency of back side image)×transparency of front side image (4A)
Pixel value of rendering image (when rendering rear surface) = pixel value of rear surface image × (1 - transparency of rear surface image) + pixel value of front surface image × (1 - transparency of front surface image) × transparency of rear surface image ... (4B)
The pixel shader PS then ends this process. The pixel shader PS repeats the pixel color determination process until the pixel colors of all pixels in the rendered image have been determined. By using the method described above, the print medium in a state where show-through occurs can be represented in the rendered image.

Figure 20 is an explanatory diagram that shows a schematic representation of the surface of a 3D object OBJ being observed, and Figure 21 is an explanatory diagram that shows a schematic representation of the rendering result displayed on the display device 300 when the surface of the 3D object OBJ is being observed. Figure 22 is an explanatory diagram that shows a schematic representation of the back surface of a 3D object OBJ, and Figure 23 is an explanatory diagram that shows a schematic representation of the rendering result displayed on the display device 300 when the back surface of the 3D object OBJ is being observed. Here, an example will be described in which a print medium with a print image printed on the front surface is represented. Note that the dot patterns in Figures 20 to 23 represent minute irregularities in the surface of the print medium and unevenness in smoothness.

20 and 22, for convenience, a 3D object OBJ composed of one polygon PL is shown. In this embodiment, the polygon PL constitutes the front surface of the 3D object OBJ as well as the back surface of the 3D object OBJ. The front surface of the 3D object OBJ is constituted by the front surface of the polygon PL, which is the surface toward which the normal vector Np of the polygon PL faces, and the back surface of the 3D object OBJ is constituted by the back surface of the polygon PL. In FIGS. 20 and 22, the line of sight of the camera CM is represented by a dashed arrow. Although not shown in FIGS. 20 and 22, the 3D object OBJ is illuminated by light from a light source.

20, when the camera CM is directed to the surface of the 3D object OBJ, the rendering unit 180 generates a rendering image of the surface of the 3D object OBJ observed through the camera CM as shown in FIG. 21, and displays the rendering image on the display device 300. As shown in FIG. 22, when the camera CM is directed to the back surface of the 3D object OBJ, the rendering unit 180 generates a rendering image of the back surface of the 3D object OBJ observed through the camera CM as shown in FIG. 23, and displays the rendering image on the display device 300. The rendering unit 180 associates the surface image data and surface texture parameters of the print image with the front surface of the 3D object OBJ, and associates the back surface image data and back surface texture parameters with the back surface of the 3D object OBJ to perform rendering according to the transparency. Therefore, in the rendering image of FIG. 21, the print medium in a state where the back surface is see-through to the front surface is represented with the texture of the surface of the print medium. The rendering image in Figure 23 shows a print medium in a state where bleed-through and show-through from the front to the back side occurs, along with the texture of the back side of the print medium.

According to the image processing device 100 of the present embodiment described above, prior to printing by the printing device 400, a rendering image representing the print medium on which an image has been printed by the printing device 400 can be generated, and the rendering image can be displayed on the display device 300. Since the permeation parameters and the translucency parameters are used to generate the rendering image, the print medium in a state where bleed-through and show-through have occurred can be expressed in the rendering image. In the present embodiment, since the texture parameters are further used to generate the rendering image, the print medium on which an image has been printed can be expressed in a realistic manner including the texture of the print medium. Therefore, a print preview can be performed using a realistic rendering image.

In addition, in this embodiment, the texture parameters include a surface texture parameter that represents the texture of the surface of the print medium, and a back surface texture parameter that represents the texture of the back surface of the print medium. Therefore, it is possible to express a print medium with different textures on the front and back surfaces with a realistic texture.

In addition, in this embodiment, in the case of single-sided printing, the rendering unit 180 performs rendering by associating the managed image data of the print image printed on the front side of the print medium with the front side of the 3D object OBJ, and by associating the print image data of the print image formed on the back side of the print medium by print-through with the back side of the 3D object OBJ. Therefore, a rendering image representing a print medium on which a print image is printed on the front side by single-sided printing and on which a print image is formed on the back side can be generated. In the case of double-sided printing, the rendering unit 180 performs rendering by associating the print image data formed on the front side of the print medium by print-through with the front side of the 3D object OBJ, and by associating the print image data formed on the back side of the print medium by print-through with the back side of the 3D object OBJ. Therefore, a rendering image representing a print medium on which a print image is formed on both the front side and the back side by double-sided printing can be generated.

In addition, in this embodiment, the bleed-through degree calculation unit 160 calculates the bleed-through degree using a pixel value penetration degree corresponding to the pixel value of the image data. Therefore, the bleed-through degree can be easily calculated from the pixel value of the image data.

In addition, in this embodiment, the transmittance calculation unit TC calculates the transmittance of the printed image using the medium transmittance, which represents the translucency of the print medium, and the ink transmittance, which represents the translucency of the ink. Therefore, since it is possible to take into account not only the translucency of the print medium but also the translucency of the ink, it is possible to more realistically represent the print medium in a state where show-through occurs. In addition, since the transmittance calculation unit TC calculates the ink amount from the pixel values of the image data and calculates the ink transmittance from the ink amount, it is possible to represent the phenomenon in which the state of show-through differs depending on the ink amount.

In addition, in this embodiment, the front surface of the 3D object OBJ is formed by the front surface of the polygon PL, and the back surface of the 3D object OBJ is formed by the back surface of the polygon PL, making it possible to represent a thin print medium.

B. Second embodiment:
24 is an explanatory diagram showing the configuration of an image processing device 100b of the second embodiment. This embodiment differs from the first embodiment in that the image processing device 100b is not provided with a show-through image data generation unit 170, and the show-through degree calculated by the show-through degree calculation unit 160 is transmitted to the rendering unit 180, which performs rendering according to the show-through degree and transparency. The rest is the same as the first embodiment unless otherwise described.

In this embodiment, in step S410 of the pixel color determination process shown in FIG. 19, the pixel shader PS acquires the degree of show-through of the front image in addition to the pixel value of the front image data corresponding to the determination target area, the surface texture parameter, and the transparency of the front image. In step S420, the pixel shader PS acquires the degree of show-through of the back image in addition to the pixel value of the back image data corresponding to the determination target area, the back texture parameter, and the transparency of the back image.

In step S440 of the pixel color determination process, the pixel shader PS determines the pixel color of the rendered image by taking into account the effects of penetration, transparency, and texture. The pixel shader PS first takes into account the effects of penetration in the area to be determined using equations (2A) and (2B), and then takes into account the effects of transparency in the area to be determined using equations (4A) and (4B).

According to the image processing device 100b of this embodiment described above, it is possible to obtain the same effect as that of the first embodiment. In particular, in this embodiment, the rendering unit 180 does not associate the previously generated bleed-through image data with the 3D object OBJ, but instead converts the pixel values of the image data associated with the 3D object OBJ using equations (2A) and (2B) so that they are similar to the pixel values of the bleed-through image data, and then calculates the pixel values of the rendering image using equations (4A) and (4B). Therefore, even if the previously generated bleed-through image data is not input to the rendering unit 180, the rendering unit 180 can perform rendering using the bleed-through degree to express bleed-through on the print medium.

C. Third embodiment:
The image processing device 100c of the third embodiment is different from the first embodiment in that the rendering unit 180 varies the application effect of the translucency parameter depending on the penetration parameter. The rest is the same as the first embodiment unless otherwise specified.

In this embodiment, the medium parameters include influence data that indicates the influence of the degree of ink penetration into the print medium on the degree of light transmission through the print medium. The influence is expressed by a value between 0 and 1. The influence data can be created by investigating the relationship between penetration and transmission through a test performed in advance. In general, the greater the degree of ink penetration into the print medium, the more light is blocked by the ink, making it more difficult for light to transmit through the print medium. The transmittance calculation unit TC corrects the medium transmittance using the influence data prior to the transmittance calculation process. In this embodiment, the transmittance calculation unit TC corrects the medium transmittance using the following formula (5). The transmittance calculation unit TC corrects the medium transmittance for each pixel.
Media permeability B = Media permeability A × (1 - strike-through rate × influence rate) (5)
Here, media transmittance A is the media transmittance before correction, and is the media transmittance pre-stored in memory 102. Media transmittance B is the media transmittance after correction, and is the media transmittance used in the transmittance calculation process. When no ink penetrates the print medium at all, the strike-through is 0, and so media transmittance B is the same as media transmittance A. When the strike-through is greater than 0, media transmittance B is smaller than media transmittance A. Thereafter, in the transmittance calculation process, the transmittance calculation unit TC calculates the transmittance of the image using media transmittance B.

Figure 25 is an explanatory diagram showing the effect of applying the influence data. The upper left side of Figure 25 shows an input image input to the image processing device 100, the upper right side shows a rendering image generated using the translucency parameter, the middle left side shows a rendering image generated using the penetration parameter, and the middle right side and bottom side show rendering images generated using the penetration parameter and the translucency parameter. The middle right side shows a rendering image when the medium transmittance is not corrected, and the bottom side shows a rendering image when the medium transmittance is corrected. When the medium transmittance is corrected, the phenomenon in which light is less likely to pass through the printing medium due to the penetration of ink into the printing medium is expressed, so the color of the area where the image is printed is expressed darker than when the medium transmittance is not corrected.

The image processing device 100 of this embodiment described above can express the phenomenon that the more ink penetrates the print medium, the more difficult it is for light to pass through the print medium. This makes it possible to further reduce the difference between the rendering result and the real thing.

D. Other embodiments:
(D1) Fig. 26 is an explanatory diagram showing the relationship between the pixel value of the material texture and the correction coefficient. When a material texture expressing the background pattern of a print medium is used, the transparency calculation unit TC of the image processing device 100 to 100c of each of the above-mentioned embodiments may calculate the transparency of the image using a correction coefficient corresponding to the pixel value of the material texture in the transparency calculation process. In this case, the transparency calculation unit TC may calculate the transparency of the image using the following formula (6A) instead of formula (3A) and the following formula (6B) instead of formula (3B).
Transmittance=1.0−(1.0−medium transmittance×ink transmittance)×correction coefficient (6A)
Transmittance = 1.0 - (1.0 - medium transmittance x existing part transmittance) x correction coefficient ... (6B)
The material texture is a color map represented in grayscale. In the white areas of the material texture, the correction coefficient is 1.0, and in the black areas, the correction coefficient is 0.0. In the gray areas, the correction coefficient is greater than 0.0 and less than 1.0, and the closer to white the value is, the greater the value is.

(D2) The image processing devices 100 to 100c of the above-described embodiments generate a rendering image using a texture parameter, a penetration parameter, and a translucency parameter. In contrast, the image processing devices 100 to 100c may generate a rendering image using a penetration parameter and a translucency parameter without using a texture parameter. Even in this case, it is possible to generate a rendering image that expresses bleed-through and show-through.

(D3) In the image processing devices 100 to 100c of each of the above-described embodiments, a rendering image is generated that represents a print medium onto which an image is directly printed by a printing device such as an inkjet printer. In contrast, the image processing devices 100 to 100c may generate a rendering image that represents a medium onto which an image is transferred by thermal transfer from transfer paper onto which an image has been printed by a printing device, for example. In this case, the medium onto which an image is transferred by thermal transfer from the transfer paper is called the print medium.

E. Other Forms:
The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various forms without departing from the spirit of the present disclosure. For example, the present disclosure can be realized in the following forms. The technical features in the above-mentioned embodiments corresponding to the technical features in each form described below can be appropriately replaced or combined in order to solve some or all of the problems of the present disclosure, or to achieve some or all of the effects of the present disclosure. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

(1) According to a first aspect of the present disclosure, there is provided an image processing device, the image processing device including: an image data acquisition unit that acquires image data; a printing condition acquisition unit that acquires printing conditions including a type of printing medium on which an image is to be printed; a color conversion unit that performs color conversion on the image data according to the printing conditions; a parameter acquisition unit that acquires medium parameters that represent properties of the printing medium, the medium parameters including a translucency parameter that represents the translucency of the printing medium and a penetration parameter that represents the permeability of the printing medium; and a rendering unit that performs rendering using a 3D object that represents a shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameter, and the penetration parameter.
According to the image processing device of this aspect, the penetration parameter can represent the bleed-through in the print medium, and the light transmission parameter can represent the show-through in the print medium, so that the print medium on which the image is printed can be represented while suppressing the difference in appearance from the actual print.

(2) In the image processing device of the above aspect, the medium parameters may include texture parameters that represent the texture of the print medium, and the rendering section may perform rendering using the texture parameters.
According to the image processing device of this aspect, the texture of the print medium can be added to the rendering result, so that the print medium on which the image is printed can be expressed in a more realistic manner.

(3) In the image processing device of the above aspect, the rendering section may vary an application effect of the translucency parameter depending on the penetration parameter.
This type of image processing device can represent the phenomenon that the more ink penetrates the printing medium, the less light passes through it, making it possible to represent the printing medium with an image printed on it in a more realistic manner.

(4) In the image processing device of the above aspect, the medium parameters may include a degree of influence of the permeability on the translucency.
According to the image processing device of this aspect, it is possible to express, by using the medium parameters, the phenomenon that the more ink permeates the print medium, the more difficult it is for light to transmit through the print medium.

(5) The image processing device of the above embodiment includes a penetration parameter-based penetration degree calculation unit that calculates the degree of penetration of the image printed on the printing medium, and a penetration image data generation unit that uses the color-converted image data and the degree of penetration to generate penetration image data representing a penetration image formed on the printing medium by penetration, and the rendering unit may associate the penetration image data with at least one of the front and back surfaces of the 3D object, and perform rendering according to the translucency parameter.
According to the image processing device of this aspect, it is possible to express bleed-through on the print medium by using bleed-through image data generated prior to rendering.

(6) In the image processing device of the above form, a print-through degree calculation unit may be provided that calculates the print-through degree of the image printed on the printing medium using the penetration parameter, and the rendering unit may perform rendering by associating the image data that has been color converted with at least one of the front and back surfaces of the 3D object, and by associating the print-through degree with the back surface of the at least one of the surfaces.
According to the image processing device of this aspect, the rendering section executes rendering using the degree of bleed-through, so that bleed-through on the print medium can be expressed.

(7) According to a second aspect of the present disclosure, there is provided a printing system comprising: the image processing device of the first aspect, a display device that displays a rendering result generated by the image processing device, and a printing device that prints the image on the print medium.
According to the printing system of this aspect, it is possible to use the rendering result generated by the image processing device to preview the print medium on which the image is printed by the printing device.

(8) According to a third aspect of the present disclosure, there is provided an image processing program that causes a computer to execute an image data acquisition function for acquiring image data, a printing condition acquisition function for acquiring printing conditions including a type of printing medium on which an image is to be printed, a color conversion function for performing color conversion on the image data according to the printing conditions, a parameter acquisition function for acquiring medium parameters that represent properties of the printing medium, the medium parameters including a translucency parameter that represents the translucency of the printing medium and a penetration parameter that represents the permeability of the printing medium, and a rendering function for performing rendering using a 3D object that represents a shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameter, and the penetration parameter.
According to this image processing program, the penetration parameter can represent the bleed-through in the print medium, and the translucency parameter can represent the show-through in the print medium, so that the print medium on which the image is printed can be represented while minimizing the difference in appearance from the actual print.

The present disclosure can also be realized in various forms other than an image processing device, a printing system, and an image processing program. For example, it can be realized in the form of an image processing method, etc.

10...printing system, 100...image processing device, 101...processor, 102...memory, 103...input/output interface, 104...internal bus, 110...image data acquisition unit, 120...printing condition acquisition unit, 131...input profile acquisition unit, 132...media profile acquisition unit, 133...common color space profile acquisition unit, 140...color management system, 150...parameter acquisition unit, 160...bleed-through degree calculation unit, 170...bleed-through image data generation unit, 180...rendering unit, 200...input device, 300...display device, 400...printing device, GS...geometry shader, PG...image processing program, PPL...pixel pipeline, PS...pixel shader, PST...post-processing unit, RBE...render backend, RRZ...rasterizer, TC...transparency calculation unit, UI1-UI2...user interface, VPL...vertex pipeline, VS...vertex shader

Claims (8)

an image data acquisition unit that acquires image data;
a printing condition acquisition unit that acquires printing conditions including the type of printing medium on which the image is to be printed;
a color conversion unit that performs color conversion on the image data in accordance with the printing conditions;
a parameter acquisition unit that acquires medium parameters that represent properties of the printing medium, the medium parameters including a translucency parameter that represents the translucency of the printing medium and a permeability parameter that represents the permeability of the printing medium;
a rendering unit that performs rendering using a 3D object representing the shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameters, and the penetration parameters;
An image processing device comprising: The medium parameters include texture parameters that represent the texture of the print medium;
The rendering unit performs rendering using the texture parameters.
The image processing device according to claim 1 . The rendering unit varies an application effect of the translucency parameter according to the penetration parameter.
The image processing device according to claim 1 . The medium parameters include the influence of the permeability on the translucency.
The image processing device according to claim 3 . a print-through degree calculation unit that calculates a print-through degree of the image printed on the print medium using the penetration parameter;
a print-through image data generating unit that generates print-through image data representing a print-through image formed on the print medium by print-through using the image data that has been subjected to the color conversion and the print-through degree;
Equipped with
the rendering unit associates the see-through image data with at least one of a front surface and a back surface of the 3D object, and performs rendering according to the light-transmitting parameters.
The image processing device according to claim 1 . a print-through degree calculation unit that calculates a print-through degree of the image printed on the print medium using the penetration parameter,
the rendering unit performs rendering by associating the image data on which the color conversion has been performed with at least one of a front surface and a back surface of the 3D object, and by associating the degree of through-holes with a back surface of the at least one surface.
The image processing device according to claim 1 . An image processing device according to any one of claims 1 to 6,
a display device that displays a rendering result generated by the image processing device;
a printing device for printing the image on the print medium;
A printing system comprising: an image data acquisition function for acquiring image data;
a printing condition acquisition function for acquiring printing conditions including the type of printing medium on which the image is to be printed;
a color conversion function for performing color conversion on the image data in accordance with the printing conditions;
a parameter acquisition function for acquiring medium parameters representing the properties of the printing medium, the medium parameters including a translucency parameter representing the translucency of the printing medium and a permeability parameter representing the permeability of the printing medium;
a rendering function that performs rendering using a 3D object representing the shape of the printing medium, the image data that has been subjected to the color conversion, the translucency parameters, and the penetration parameters;
An image processing program that causes a computer to execute the following:

Images