Information Processing Apparatus and Information Processing Program

Abstract

To provide an information processing device and an information processing program capable of achieving both gradation and color reproducibility.SOLUTION: An information processing device includes CPU for calculating the values of some colors of a device-dependent color system including spot colors for each of target values of a device-independent color system, changing some color values of the device-dependent color system so as to smoothen variation of some color values of the device-dependent color system with respect to the variation of the values of the device-independent color system, calculating remaining color values of the device-dependent color system based on the changed some color values of the device-dependent color system for each of the target values of the device-independent color system, and creating a color conversion profile for receiving the values of the device-independent color system and outputting the changed some color values of the device-dependent color system and the remaining color values of the device-dependent color system.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an information processing apparatus and an information processing program.

Background Art

[0002] Patent Document 1 describes an initial step of creating a color separation table that sets lattice points with process colors as color components and represents the color on each lattice point by the decomposition values of each color component when approximating the color with a mixture of the process color and a special color, a smoothing step of smoothing the decomposition values corresponding to each lattice point of the color separation table, and a color shift correction step of changing the decomposition values corresponding to each lattice point of the color separation table after smoothing so that the color shift due to the smoothing is corrected. In the color shift correction step, the decomposition values of some color components among the process color and the special color are fixed, and the decomposition values of the other color components are changed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a technique of creating a color conversion profile by performing smoothing. In this technique, smoothing is performed for all colors to create a color conversion profile.

[0005] However, since smoothing is performed for all colors, although the gradation property is improved, the color reproducibility deteriorates. In particular, when the color of the color conversion profile includes a special color, since the accuracy of the color conversion profile of the special color is low, it is difficult to achieve both gradation property and color reproducibility.

[0006] An object of the present invention is to provide an information processing apparatus and an information processing program capable of achieving both gradation and color reproducibility as compared with the case of smoothing all colors of a color conversion profile.

Means for Solving the Problems

[0007] The information processing apparatus according to the first aspect includes a processor. The processor calculates values of some colors in a device-dependent color space including characteristics for each value in a target device-independent color space, and changes the values of some colors in the device-dependent color space so as to smooth the change in the values of some colors in the device-dependent color space with respect to the change in the values in the device-independent color space. For each value in the target device-independent color space, based on the values of some colors in the changed device-dependent color space, the processor calculates the values of the remaining colors in the device-dependent color space, and creates a color conversion profile that takes the values in the device-independent color space as input and outputs the values of some colors in the changed device-dependent color space and the values of the remaining colors in the device-dependent color space.

[0008] Further, in the information processing apparatus according to the second aspect, in the information processing apparatus according to the first aspect, some colors in the device-dependent color space are the characteristics or black.

[0009] Further, in the information processing apparatus according to the third aspect, in the information processing apparatus according to the second aspect, some colors in the device-dependent color space are the characteristics. The processor calculates the value of black in the device-dependent color space based on the value of the characteristics in the changed device-dependent color space for each value in the target device-independent color space, and calculates the values of the remaining colors in the device-dependent color space based on the value of the characteristics in the changed device-dependent color space and the value of black for each value in the target device-independent color space. The processor creates a color conversion profile that takes the values in the device-independent color space as input and outputs the value of the characteristics in the changed device-dependent color space, the value of black, and the values of the remaining colors in the device-dependent color space.

[0010] Further, the information processing apparatus according to the fourth aspect is the information processing apparatus according to the second aspect, wherein some of the colors in the device-dependent color space are a plurality of characteristic colors, and the processor calculates the values of the characteristic colors for each of the values of the target device-independent color space, and changes the values of the characteristic colors in the device-dependent color space so as to smooth the changes in the values of the characteristic colors in the device-dependent color space with respect to the changes in the values of the device-independent color space.

[0011] Further, the information processing apparatus according to the fifth aspect is the information processing apparatus according to the second aspect, wherein some of the colors in the device-dependent color space are the characteristic colors and black, and the processor calculates the values of the characteristic colors for each of the values of the target device-independent color space, changes the values of the characteristic colors in the device-dependent color space so as to smooth the changes in the values of the characteristic colors in the device-dependent color space with respect to the changes in the values of the device-independent color space, calculates the values of black based on the changed values of the characteristic colors for each of the values of the target device-independent color space, changes the values of black in the device-dependent color space so as to smooth the changes in the values of black in the device-dependent color space with respect to the changes in the values of the device-independent color space, calculates the values of the remaining colors in the device-dependent color space based on the changed values of the characteristic colors and the changed values of black in the device-dependent color space for each of the values of the target device-independent color space, and creates a color conversion profile that takes the values of the device-independent color space as input and outputs the changed values of the characteristic colors, the changed values of black, and the values of the remaining colors in the device-dependent color space.

[0012] Also, in the information processing apparatus according to the sixth aspect, in the information processing apparatus according to the second aspect, some colors in the device-dependent color space are black, and the processor calculates the value of the characteristic color in the device-dependent color space based on the value of black in the changed device-dependent color space for each value of the target device-independent color space, and calculates the values of the remaining colors in the device-dependent color space based on the value of black in the changed device-dependent color space and the value of the characteristic color for each value of the target device-independent color space, and creates a color conversion profile that takes the value of the device-independent color space as input and outputs the value of black in the changed device-dependent color space, the value of the characteristic color, and the values of the remaining colors in the device-dependent color space.

[0013] Also, in the information processing apparatus according to the seventh aspect, in the information processing apparatus according to the sixth aspect, the characteristic is a plurality of characteristics, and the processor calculates the value of the characteristic color in the device-dependent color space based on the value of black in the changed device-dependent color space for each of the plurality of characteristics and for each value of the target device-independent color space, and calculates the values of the remaining colors in the device-dependent color space based on the value of black in the changed device-dependent color space and the values of each of the plurality of characteristics for each value of the target device-independent color space, and creates a color conversion profile that takes the value of the device-independent color space as input and outputs the value of black in the changed device-dependent color space, the values of each of the plurality of characteristics, and the values of the remaining colors in the device-dependent color space.

[0014] Further, the information processing apparatus according to the eighth aspect is the information processing apparatus according to the second aspect, wherein some colors of the device-dependent color space are the characteristic color and black, and the processor calculates a black value for each of the values of the target device-independent color space, and changes the black value of the device-dependent color space so as to smooth the change in the black value of the device-dependent color space with respect to the change in the value of the device-independent color space. For each of the values of the target device-independent color space, a characteristic color value is calculated based on the changed black value, and the characteristic color value of the device-dependent color space is changed so as to smooth the change in the characteristic color value of the device-dependent color space with respect to the change in the value of the device-independent color space. For each of the values of the target device-independent color space, based on the changed black value and the changed characteristic color value of the device-dependent color space, values of the remaining colors of the device-dependent color space are calculated, and a color conversion profile is created that takes the value of the device-independent color space as an input and outputs the changed black value, the changed characteristic color value, and the values of the remaining colors of the device-dependent color space.

[0015] Further, the information processing program according to the ninth aspect causes a computer to calculate values of some colors of a device-dependent color space including a characteristic color for each of the values of a target device-independent color space, change the values of some colors of the device-dependent color space so as to smooth the change in the values of some colors of the device-dependent color space with respect to the change in the value of the device-independent color space, calculate values of the remaining colors of the device-dependent color space based on the changed values of some colors of the device-dependent color space for each of the values of the target device-independent color space, and create a color conversion profile that takes the value of the device-independent color space as an input and outputs the changed values of some colors of the device-dependent color space and the values of the remaining colors of the device-dependent color space.

Advantages of the Invention

[0016] According to the first aspect, it is possible to achieve both gradation and color reproducibility as compared with the case of smoothing all colors of the color conversion profile.

[0017] According to the second aspect, color reproducibility can be improved as compared with the case where no smoothing is performed on the feature color or black color.

[0018] According to the third aspect, color reproducibility can be improved as compared with the case where no smoothing is performed on the feature color.

[0019] According to the fourth aspect, even when there are a plurality of feature colors, it is possible to achieve both gradation and color reproducibility.

[0020] According to the fifth aspect, gradation can be improved as compared with the case where no smoothing is performed on the feature color and black color.

[0021] According to the sixth aspect, color reproducibility can be improved as compared with the case where no smoothing is performed on the black color.

[0022] According to the seventh aspect, even when there are a plurality of feature colors, it is possible to achieve both gradation and color reproducibility.

[0023] According to the eighth aspect, gradation can be improved as compared with the case where no smoothing is performed on the feature color and black color.

[0024] According to the ninth aspect, it is possible to achieve both gradation and color reproducibility as compared with the case where smoothing is performed on all colors of the color conversion profile.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0026] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same or equivalent components and parts are given the same reference numerals. Also, the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0027] [First Embodiment] FIG. 1 is a block diagram showing the hardware configuration of an image forming apparatus as an information processing apparatus according to the first embodiment.

[0028] The image forming apparatus 10 is an apparatus that forms an image on a recording medium such as paper based on a print job, and may be any apparatus such as a printer or a multifunction device.

[0029] The image forming apparatus 10 according to the present embodiment includes a CPU (Central Processing Unit) 10A as an example of a processor, a ROM (Read Only Memory) 10B, a RAM (Random Access Memory) 10C, an HDD (hard disk drive) 10D, a display 10F, a communication line I / F (interface) unit 10G, and an output unit 10H.

[0030] The CPU 10A controls the overall operation of the image forming apparatus 10. The ROM 10B stores various control programs and various parameters in advance. The RAM 10C is used as a work area and the like when various programs are executed by the CPU 10A. The HDD 10D stores various data and application programs and the like. The display 10F is a touch panel display and is used to input various information and display various information.

[0031] The communication line I / F unit 10G is connected to a communication line (not shown) and performs transmission and reception of various data with other devices connected to the communication line.

[0032] The output unit 10H forms an image on a recording medium such as paper using inks or toners of each color of CMYK (cyan, magenta, yellow, black) and spot colors (e.g., fluorescent pink) based on a print job.

[0033] Each unit of the above-described image forming apparatus 10 is electrically interconnected by a system bus 10J. Note that in the image forming apparatus 10 according to the present embodiment, the HDD 10D is applied as a storage unit, but the present invention is not limited thereto, and other non-volatile storage units such as a flash memory may be applied.

[0034] With the above configuration, the image forming apparatus 10 according to the present embodiment executes access to the ROM 10B, the RAM 10C, and the HDD 10D, acquisition of various data via the display 10F, and display of various information on the display 10F by the CPU 10A. Further, the image forming apparatus 10 executes control of transmission and reception of communication data via the communication line I / F unit 10G by the CPU 10A. For example, image data is received from an information processing terminal realized by a PC (personal computer) or the like via the communication line I / F unit 10G.

[0035] In the image forming apparatus 10 according to the present embodiment, the CPU 10A executes a program stored in advance in the ROM 10B or the HDD 10D to perform a process of creating a color conversion profile that takes values in a device-independent color space as input and outputs values in a device-dependent color space.

[0036] Subsequently, the functional configuration of the image forming apparatus 10 according to the present embodiment configured as described above will be described. FIG. 2 is a functional block diagram of the image forming apparatus 10 according to the present embodiment. Note that each functional unit is realized by the CPU 10A executing a program stored in advance in the ROM 10B or the HDD 10D.

[0037] The image forming apparatus 10 has the functions of a first profile calculation unit 12, a smoothing unit 14, a second profile calculation unit 16, a profile storage unit 18, and a color conversion unit 20.

[0038] The first profile calculation unit 12 sets, as values of a target device-independent color space, the values of a device-independent color space (for example, L * a * b * * space) corresponding to the values of a first device-dependent color space (for example, RGB (red, green, blue)) of each lattice point within the input color space of the information processing terminal (for example, R, G, B = 0, 0, 0 to 255, 255, 255). For each of the values of the target device-independent color space, the first profile calculation unit 12 calculates, respectively, the values of the characteristics of a second device-dependent color space (for example, CMYK (cyan, magenta, yellow, black) and characteristics) including characteristics.

[0039] The smoothing unit 14 changes the values of the characteristics so as to smooth the change in the values of the characteristics of the second device-dependent color space with respect to the change in the values of the device-independent color space.

[0040] The second profile calculation unit 16 calculates, for each of the values of the target device-independent color space, the value of the K color of the second device-dependent color space based on the changed values of the characteristics.

[0041] The second profile calculation unit 16 calculates, for each of the values of the target device-independent color space, the values of the CMY colors of the second device-dependent color space based on the changed values of the characteristics and the value of the K color.

[0042] The second profile calculation unit 16 creates color conversion profiles for a special color plate, a K plate, and a CMY plate that take, as input, the values of the device-independent color space and output the changed values of the characteristics, the value of the K color, and the values of the CMY colors of the second device-dependent color space based on the calculation results of the changed values of the characteristics, the value of the K color, and the values of the CMY colors.

[0043] The profile storage unit 18 stores the created color conversion profiles for the special color version, K version, and CMY version.

[0044] The color conversion unit 20 performs color conversion processing on the image data received from the information processing terminal using the color conversion profiles for the special color version, K version, and CMY version, generates a print job represented by CMYK special data, and outputs it to the output unit 10H.

[0045] Next, the processing performed by the image forming apparatus 10 according to the first embodiment configured as described above will be described. FIG. 3 is a flowchart showing an example of the flow of specific processing performed by the image forming apparatus 10 according to the present embodiment. Note that the processing in FIG. 3 starts when creation of a color conversion profile is instructed in the image forming apparatus 10.

[0046] In step S100, the first profile calculation unit 12 calculates the value of the special color of the second device-dependent color space for each value of the target device-dependent color space.

[0047] In step S102, the smoothing unit 14 changes the value of the special color so as to smooth the change in the value of the special color of the second device-dependent color space with respect to the change in the value of the device-independent color space.

[0048] In step S104, the second profile calculation unit 16 calculates the value of the K color of the second device-dependent color space for each value of the target device-independent color space based on the changed value of the special color.

[0049] In step S106, the second profile calculation unit 16 calculates the value of the CMY color of the second device-dependent color space for each value of the target device-independent color space based on the changed value of the special color and the value of the K color.

[0050] Based on the calculated results of the values of the features after the change, the values of the K color, and the values of the CMY colors, the second profile calculation unit 16 creates color conversion profiles for the feature plate, the K plate, and the CMY plate that take the values in the device-independent color space as inputs and output the values of the features after the change, the values of the K color, and the values of the CMY colors in the second device-dependent color space.

[0051] Then, the created color conversion profiles for the feature plate, the K plate, and the CMY plate are stored in the profile storage unit 18, and the process ends.

[0052] As described above, when creating a color conversion profile that outputs the values in the device-dependent color space including features from the values in the device-independent color space, after smoothing the values of some of the colors in the device-dependent color space, calculate the values of the remaining colors and create a color conversion profile, it is possible to achieve both gradation and color reproducibility.

[0053] Also, since the creation accuracy of the color conversion profile for the features is low, by smoothing the values of the features and then calculating the remaining colors and creating a color conversion profile, the gradation of the color conversion profile can be improved. Thereby, both gradation and color reproducibility can be achieved.

[0054] Note that in the above embodiment, the case where smoothing is performed only on the feature plate is described as an example, but it is not limited thereto. Smoothing may also be performed on the K plate.

[0055] Also, although the case where there is one characteristic has been described as an example, it is not limited to this. There may be a plurality of characteristics. For example, fluorescent pink and green may be used as characteristics. In this case, smoothing may be performed for all of the plurality of characteristics. Specifically, the following processing may be performed for each of the plurality of characteristics. For each of the values of the target device-independent color space, calculate the value of the characteristic, and change the value of the characteristic in the device-dependent color space so as to smooth the change in the value of the characteristic in the device-dependent color space with respect to the change in the value of the device-independent color space. Also, smoothing may be performed for some of the plurality of characteristics. Also, the types of characteristics are not limited to fluorescent pink and green.

[0056] [Second Embodiment] Next, the image forming apparatus according to the second embodiment will be described. Since the image forming apparatus according to the second embodiment has the same configuration as that of the first embodiment, the same reference numerals will be given and the description thereof will be omitted.

[0057] In the second embodiment, it is different from the first embodiment in that smoothing is performed on the K plate.

[0058] The first profile calculation unit 12 of the image forming apparatus 10 according to the second embodiment sets each of the values of the device-independent color space corresponding to the values of the first device-dependent color space of each grid point within the input color gamut of the information processing terminal as the target device-dependent color space values. The first profile calculation unit 12 calculates each of the values of the K color in the second device-dependent color space including the characteristic for each of the target device-independent color space values.

[0059] The smoothing unit 14 changes the value of the K color so as to smooth the change in the value of the K color in the second device-dependent color space with respect to the change in the value of the device-independent color space.

[0060] The second profile calculation unit 16 calculates each of the values of the characteristics in the second device-dependent color space based on the changed value of the K color for each of the target device-independent color space values.

[0061] For each value of the target device-independent color space, the second profile calculation unit 16 calculates the CMY color values of the second device-dependent color space based on the value of the changed K color and the value of the feature color.

[0062] Based on the calculated results of the value of the changed K color, the value of the feature color, and the CMY color values, the second profile calculation unit 16 creates color conversion profiles for the feature version, K version, and CMY version, which take the value of the device-independent color space as input and output the value of the changed K color, the value of the feature color, and the CMY color values of the second device-dependent color space.

[0063] The profile storage unit 18 stores the created color conversion profiles for the feature version, K version, and CMY version.

[0064] Subsequently, the processing performed by the image forming apparatus 10 according to the second embodiment configured as described above will be described. FIG. 4 is a flowchart showing an example of the flow of specific processing performed by the image forming apparatus 10 according to the second embodiment. Note that the processing in FIG. 4 starts when creation of a color conversion profile is instructed in the image forming apparatus 10.

[0065] In step S200, the first profile calculation unit 12 calculates the K color values of the second device-dependent color space for each value of the target device-independent color space.

[0066] In step S202, the smoothing unit 14 changes the K color value so as to smooth the change in the K color value of the second device-dependent color space with respect to the change in the value of the device-independent color space.

[0067] In step S204, the second profile calculation unit 16 calculates the feature color values of the second device-dependent color space based on the changed K color values for each value of the target device-independent color space.

[0068] In step S206, for each of the values in the target device-independent color space, the second profile calculation unit 16 calculates the CMY color values in the second device-dependent color space based on the changed value of the K color and the value of the feature in the color conversion profile of the special edition.

[0069] Based on the calculated results of the changed value of the K color, the value of the feature, and the CMY color values, the second profile calculation unit 16 creates color conversion profiles for the special edition, the K plate, and the CMY plate that take the value in the device-independent color space as input and output the changed value of the K color, the value of the feature, and the CMY color values in the second device-dependent color space.

[0070] Then, the created color conversion profiles for the special edition, the K plate, and the CMY plate are stored in the profile storage unit 18, and the process ends.

[0071] As described above, when creating a color conversion profile that outputs the values in the device-dependent color space including features from the values in the device-independent color space, by performing smoothing on the black color in the device-dependent color space, calculating the remaining colors, and creating the color conversion profile, it is possible to achieve both gradation and color reproducibility.

[0072] In the above second embodiment, the case where smoothing is performed only on the K plate is described as an example, but it is not limited thereto. Smoothing may also be performed on the special edition.

[0073] Also, the case where there is one feature is described as an example, but it is not limited thereto. There may be a plurality of features. In this case, after performing smoothing on the K plate, the following process may be performed for each of the plurality of features. For each of the values in the target device-independent color space, calculate the value of the feature in the device-dependent color space based on the changed value of the K color. Then, for each of the values in the target device-independent color space, calculate the CMY color values in the device-dependent color space based on the changed value of the K color and the values of the plurality of features, and create color conversion profiles for the special edition, the K plate, and the CMY plate.

[0074] Also, in the first and second embodiments, the device-independent color space is L * a * b * space, which has been described as an example, but is not limited thereto, and other device-independent color spaces may be used.

[0075] Also, the case where the second device-dependent color space is spot color and CMYK color has been described as an example, but is not limited thereto, and colors other than spot color may be other colors than CMYK color.

[0076] Also, the case where the present invention is applied to an image forming apparatus has been described as an example, but is not limited thereto. The present invention may be applied to information processing apparatuses such as smartphones and computers.

[0077] Also, in the above embodiments, the CPU 10A has been described as an example of a processor, but the processor refers to a processor in a broad sense and includes general-purpose processors (e.g., CPU: Central Processing Unit, etc.) and dedicated processors (e.g., GPU: Graphics Processing Unit, ASIC: Application Specific Integrated Circuit, FPGA: Field Programmable Gate Array, programmable logic device, etc.).

[0078] Also, the operations of the processor in each of the above embodiments may be performed not only by one processor but also by a plurality of processors physically separated from each other cooperating with each other. Also, the order of each operation of the processor is not limited to the order described in each of the above embodiments and may be changed as appropriate.

[0079] In addition, the processing performed by the image forming apparatus 10 according to the above embodiment may be processing performed by software, may be processing performed by hardware, or may be processing that combines both. Further, the processing performed by the image forming apparatus 10 may be stored in a storage medium as a program and distributed.

[0080] Furthermore, the present invention is not limited to the above, and it goes without saying that various modifications can be made and implemented within the scope without departing from the gist thereof.

Explanation of Reference Numerals

[0081] 10 Image forming apparatus 10A CPU 12 First profile calculation unit 14 Smoothing unit 16 Second profile calculation unit 18 Profile storage unit 20 Color conversion unit

Claims

1. comprising a processor, wherein the processor calculates, for each of the values of the color space of a target device-independent color space, values of a part of the colors of a device-dependent color space including CMYK colors and a feature different from the CMYK colors; smoothes each of the calculated values of the part of the colors of the device-dependent color space so that the change in the values of the part of the colors of the device-dependent color space becomes smooth when the value of the color space of the device-independent color space changes; calculates, for each of the values of the color space of the target device-independent color space, values of the remaining colors of the device-dependent color space based on the smoothed values of the part of the colors of the device-dependent color space, and creates a color conversion profile that takes the value of the color space of the device-independent color space as an input and outputs the smoothed values of the part of the colors of the device-dependent color space and the values of the remaining colors of the device-dependent color space; an information processing apparatus, wherein a part of the colors of the device-dependent color space is the feature, wherein the processor calculates, for each of the values of the color space of the target device-independent color space, the value of black of the device-dependent color space based on the smoothed value of the feature of the device-dependent color space; calculates, for each of the values of the color space of the target device-independent color space, the values of each of the CMY colors of the device-dependent color space based on the smoothed value of the feature of the device-dependent color space and the value of black, and creates a color conversion profile that takes the value of the color space of the device-independent color space as an input and outputs the smoothed value of the feature of the device-dependent color space, the value of black, and the values of each of the CMY colors of the device-dependent color space; wherein the device is an information processing apparatus which is an image forming apparatus that forms an image on a recording medium using CMYK colors and the feature.

2. comprising a processor, wherein the processor calculates, for each of the values of the color space of a target device-independent color space, values of a part of the colors of a device-dependent color space including CMYK colors and a feature different from the CMYK colors; smoothes each of the calculated values of the part of the colors of the device-dependent color space so that the change in the values of the part of the colors of the device-dependent color space becomes smooth when the value of the color space of the device-independent color space changes; For each value in the color space of the target device-independent color space, based on the values of some colors in the smoothed device-dependent color space, calculate the values of the remaining colors in the device-dependent color space, and create a color conversion profile that takes the value in the color space of the device-independent color space as input and outputs the values of some colors in the smoothed device-dependent color space and the values of the remaining colors in the device-dependent color space. An information processing apparatus, Some of the colors in the device-dependent color space are the spot color and black, The processor, For each value in the color space of the target device-independent color space, calculate the value of the spot color, Smooth each of the calculated values of the spot color in the device-dependent color space so that the change in the value of the spot color in the device-dependent color space is smooth when the value in the color space of the device-independent color space changes, For each value in the color space of the target device-independent color space, calculate the value of the black color based on the smoothed value of the spot color, Smooth each of the calculated values of the black color in the device-dependent color space so that the change in the value of the black color in the device-dependent color space is smooth when the value in the color space of the device-independent color space changes, For each value in the color space of the target device-independent color space, calculate the value of each color in the CMY color of the device-dependent color space based on the smoothed value of the spot color and the smoothed value of the black color in the device-dependent color space, and create a color conversion profile that takes the value in the color space of the device-independent color space as input and outputs the smoothed value of the spot color, the smoothed value of the black color, and the value of each color in the CMY color of the device-dependent color space. The device is an information processing apparatus that is an image forming apparatus that forms an image on a recording medium using CMYK colors and the spot color.

3. For each value in the color space of the target device-independent color space, calculate the values of some colors in the device-dependent color space including CMYK colors and a spot color different from the CMYK colors, Smooth each of the calculated values of some colors in the device-dependent color space so that the change in the values of some colors in the device-dependent color space is smooth when the value in the color space of the device-independent color space changes, For each value in the color space of the target device-independent color space, based on the values of some colors in the smoothed device-dependent color space, calculate the values of the remaining colors in the device-dependent color space, and create a color conversion profile that takes the values in the color space of the device-independent color space as input and outputs the values of some colors in the smoothed device-dependent color space and the values of the remaining colors in the device-dependent color space. An information processing program that causes a computer to execute the following: Some of the colors in the device-dependent color space are the characteristic colors. By creating the color conversion profile: For each value in the color space of the target device-independent color space, calculate the value of black in the device-dependent color space based on the values of the characteristic colors in the smoothed device-dependent color space. For each value in the color space of the target device-independent color space, calculate the values of each of the CMY colors in the device-dependent color space based on the values of the characteristic colors and the value of black in the smoothed device-dependent color space, and create a color conversion profile that takes the values in the color space of the device-independent color space as input and outputs the values of the characteristic colors, the value of black, and the values of each of the CMY colors in the device-dependent color space. An information processing program, wherein the device is an image forming apparatus that forms an image on a recording medium using CMYK colors and the characteristic colors.

4. For each value in the color space of the target device-independent color space, calculate the values of some colors in the device-dependent color space including CMYK colors and characteristic colors different from the CMYK colors. Smooth each of the calculated values of some colors in the device-dependent color space so that the change in the values of some colors in the device-dependent color space is smooth when the values in the color space of the device-independent color space change. For each value in the color space of the target device-independent color space, based on the values of some colors in the smoothed device-dependent color space, calculate the values of the remaining colors in the device-dependent color space, and create a color conversion profile that takes the values in the color space of the device-independent color space as input and outputs the values of some colors in the smoothed device-dependent color space and the values of the remaining colors in the device-dependent color space. An information processing program that causes a computer to execute the following: Some of the colors in the device-dependent color space are the characteristic colors and black. By creating the color conversion profile: For each of the values in the color space of the target device-independent color system, calculate the value of the feature. Smooth each of the calculated values of the feature in the device-dependent color system so that the change in the value of the feature in the device-dependent color system is smooth when the value in the color space of the device-independent color system changes. For each of the values in the color space of the target device-independent color system, calculate the value of the black based on the smoothed value of the feature. Smooth each of the calculated values of the black in the device-dependent color system so that the change in the value of the black in the device-dependent color system is smooth when the value in the color space of the device-independent color system changes. For each of the values in the color space of the target device-independent color system, calculate the value of each color of CMY in the device-dependent color system based on the smoothed value of the feature in the device-dependent color system and the smoothed value of the black, and create a color conversion profile that takes the value in the color space of the device-independent color system as input and outputs the smoothed value of the feature in the device-dependent color system, the smoothed value of the black, and the value of each color of CMY in the device-dependent color system. An information processing program in which the device is an image forming apparatus that forms an image on a recording medium using CMYK colors and the feature.

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