JP6164007B2 - Program for selecting usable color, method thereof, and image display apparatus - Google Patents

Description

  The present invention relates to a technique for selecting usable colors that can be easily distinguished.

  An image forming apparatus for facilitating color identification is known for people who have difficulty in color identification (also called “discrimination” or “discrimination”). For example, in the apparatus described in Patent Document 1, an image input from the scanner unit is displayed on the operation panel, and a color conversion pattern is created by selecting a color that the operator can identify or cannot identify in the image, Based on this color conversion pattern, color conversion (also referred to as “color adjustment”) is performed so that the operator can identify the color. Also, when performing color adjustment, color adjustment is performed so that the operator can identify the color by shifting the R, G, and B components of the color based on the original color present in the actual image. I was going.

JP 2007-4310 A

  In the conventional color adjustment technique described above, since the color adjustment is performed by changing the R, G, and B components of the original color existing in the actual image, there is a limit to the range in which the color can be changed. For this reason, even when color adjustment is performed, there are cases where the combination of colors is not easily identified.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

(1) According to the embodiment of the present invention, N usable colors (N is 2 or more and smaller than M) among M (M is an integer of 3 or more) candidate colors used for displaying or printing an image. A program for selecting an integer) is provided. This program has a function of presenting at least some candidate colors among the M candidate colors, and an input of color discrimination ease with respect to each of the presented candidate colors. And a function of selecting N usable colors from the M candidate colors based on the ease of color discrimination. According to this form of the program, usable colors that can be easily distinguished can be easily selected.

(2) In the program of the above aspect, the function for selecting the usable color is a color having a level indicating a combination of candidate colors that cannot be distinguished in the ease of color discrimination between the presented candidate colors. If there is discrimination easiness, among _M C _N number of colors set including N colors in the M candidate color, L number (L comprising a combination of indistinguishable candidate color is an integer of 1 or more ) From the ( _M C _N -L) color sets excluding the color set, and selecting one color set based on the color discrimination ease, and N colors included in the one color set May be included. According to this form of the program, it is possible to select a color that does not include a combination of colors that cannot be distinguished in the degree of color discrimination.

(3) In the program according to the above aspect, the computer may realize a function of converting the color of the image into the N usable colors.

(4) In the program of the above aspect, in the color conversion, the (MN) candidate colors that are not used in the color conversion are changed to usable colors having the smallest color difference among the N usable colors. It may include converting. According to this form of the program, when a person who is not difficult to discriminate between colors sees the image after color conversion, it is difficult to cause a sense of discomfort.

(5) In the program of the above aspect, the color conversion may include converting (MN) candidate colors that are not used in the color conversion into usable colors that are achromatic colors. According to this form of the program, the converted image can be easily viewed.

(6) In the program according to the above aspect, the computer may further realize a function of causing the image display unit to display an image color-converted using the N usable colors.

(7) In the program according to the above aspect, the computer may further have a function of causing the printing apparatus to print an image color-converted using the N usable colors.

(8) According to the embodiment of the present invention, N usable colors (N is 2 or more and smaller than M) among M (M is an integer of 3 or more) candidate colors used for displaying or printing an image. A method for selecting an integer) is provided. The method includes a step of presenting at least some candidate colors among the M candidate colors, and an input of color discrimination ease with respect to each of the presented candidate colors with the presented other candidate colors. And a step of selecting N usable colors from the M candidate colors based on the color discrimination ease. According to this method, it is possible to easily select N colors that are easily discriminated.

(9) According to the aspect of the present invention, an image display device is provided. The image display device includes an image display unit that displays an image, and a control unit that controls display of the image. The control unit includes M (M is 3 or more) used for displaying or printing the image. At least a part of candidate colors among the candidate colors, and accepting an input of the color discrimination ease with the other candidate colors presented for each of the presented candidate colors, and the color discrimination easy Based on the degree, N usable colors are selected from the M candidate colors, and the image that has been color-converted using the N usable colors is displayed on the image display unit.

  The present invention can be realized in various forms. For example, in addition to a program for selecting a color, a non-transitory storage medium storing a program for selecting a color (non-transitory storage) medium), a method for selecting a color, an image display device, a printing device, and the like.

It is explanatory drawing which shows the structure of the smart phone concerning a 1st Example. It is explanatory drawing which shows the structural example of a color conversion table. It is a flowchart which displays the image of N color. It is an example of the input screen of the color discrimination ease displayed on an image display part. It is a modification of the input screen of the color discrimination ease displayed on an image display part. It is explanatory drawing which shows the relationship of the color discrimination ease of a candidate color. It is explanatory drawing which shows the example of an image display in this embodiment. It is a modification of the input screen of the color discrimination ease displayed on the image display unit when M = 9. It is explanatory drawing which shows the color conversion in 2nd Embodiment.

First embodiment:
FIG. 1 is an explanatory diagram illustrating the configuration of the smartphone according to the first embodiment. The smartphone 10 is a portable information terminal having a telephone function, and has a function as an image display device. The smartphone 10 includes a CPU 100, a RAM 110, a nonvolatile memory 120, an image input unit 150, an image display unit 160, a wireless communication unit 170, and a telephone communication unit 180. The CPU 100 functions as a control unit that controls various operations of the image display device 160. The image input unit 150 has a function of receiving image input. The image display unit 160 has a touch panel function that can accept input from a user. The wireless communication unit 170 has a function of connecting the smartphone 10 to a wireless LAN.

The non-volatile memory 120 stores a color discrimination ease input program 122, a color set selection program 124, a color conversion program 126, a color conversion table 128, and an image display program 130. The color discrimination ease input program 122 is a program for allowing the user to input the color discrimination ease between M candidate colors (M is an integer of 3 or more) used for display on the image display unit 160. is there. The color set selection program 124 is a program for selecting N usable colors (N is an integer greater than or equal to 2 and smaller than M) from M candidate colors based on the input color discrimination ease. In the present embodiment, a collection of a plurality of colors is referred to as a color set. There are _M C _N combinations (= M! / [N! × (M−N)!]) For selecting N from M, and the color set selection program 124 sends _M to CPU 100 based on the color discrimination ease. C. Perform a function of selecting one color set from _N color sets. The color conversion program 126 converts the color of the image into N usable colors based on the color conversion table 128.

FIG. 2 is an explanatory diagram showing an example of the configuration of the color conversion table 128. The color conversion table 128 can use, for example, one first color conversion table 128a for reducing a full-color color (RGB 24-bit color) to M candidate colors, and N number of M candidate colors. A plurality of second color conversion tables 128b for conversion into colors are provided. Here, the process of reducing the full-color color (RGB 24-bit color) to M candidate colors can be executed, for example, by replacing all the predetermined number of lower-order bits (for example, lower 6 bits) of each RGB color with zeros. Yes, it is possible to execute without using the first color conversion table 128a. The first color conversion table 128a may be a table that outputs Q colors (Q is an integer greater than or equal to M) including at least M candidate colors. Examples of the breakdown of the Q colors include (M colors + arbitrary q colors desired by the user). As the second color conversion table 128b, a plurality of tables for outputting all combinations (color sets) of N colors that can be adopted as usable colors are created in advance. For example, the second color conversion table 128b includes _M C _N different tables for outputting _N usable colors in response to input of M candidate colors. Even if the number of output colors of the first conversion table 128a is Q, if the conversion from Q colors to M candidate colors is fixed in advance, the second color conversion table 128b is used as Q A table including _M CN tables that output _N usable colors in response to input of colors can be used.

  Note that the color conversion table 128 can be configured as a table that completes the color conversion in only one step by combining the two steps of the first color conversion table 128a and the second color conversion table 128b. However, the two-stage color conversion table as shown in FIG. 2 has an advantage that the capacity of the entire color conversion table can be reduced as compared with the one-stage color conversion table in which these two-stage conversions are combined.

In the second color conversion table 128b, the specific color that has not been selected as the N usable colors among the M candidate colors is the smallest in color difference from the specific color among the N usable colors. It may be configured as a color conversion table including conversion to usable colors. Here, “color difference” means the color difference ΔE in the L ^* a ^* b ^* color system. In this case, when a person who is not difficult to discriminate between colors looks at the image after color conversion, it is difficult to cause a sense of incongruity. Alternatively, the second color conversion table 128b may select a specific color that has not been selected as the N usable colors from among the M candidate colors, and the color of the color on the image among the N usable colors. It may be configured as a color conversion table including conversion to any usable color in consideration of ease of identification. For example, the specific color may be a usable color that has the largest color difference from the specific color or a usable color that is a gray color having a specific intermediate gradation. In this case, the converted image can be easily seen. The “color difference” may be a color difference in a color system other than the L ^* a ^* b ^* color system. Examples of other color systems include XYZ color system, L ^* u ^* v ^* color system, Munsell color system, and the like.

  The M candidate colors preferably include a plurality of achromatic colors and a plurality of chromatic colors. Further, the plurality of achromatic colors preferably include white, black, and at least one gray color having an intermediate gradation between the two, and particularly include a plurality of gray colors having different gradations (density). preferable. In the first embodiment, the M candidate colors are arbitrarily selected in advance regardless of the input image.

  The image display program 130 causes the CPU 100 to execute a function for causing the image display unit 160 to display an image after color conversion. A part or all of two or more of these programs 122, 124, 126, and 130 may be implemented as one program.

  FIG. 3 is a flowchart illustrating a processing procedure for performing color conversion and displaying an N-color image in the first embodiment. In step S100, the user activates the color discrimination ease input program 122 and inputs the color discrimination ease between each of the M candidate colors. Note that the M candidate colors are determined in advance before this process starts. More specifically, when creating the second color conversion table 128b described with reference to FIG. 2, M candidate colors are selected. Therefore, the selection of the M candidate colors is already executed when the color discrimination ease input program 122 and the color set selection program 124 are created regardless of the color of the image input to the smartphone 10.

FIG. 4 is an example of an input screen for the color discrimination ease displayed on the image display unit 160. Here, for convenience of explanation, a case where four colors c1 to c4 are used as M candidate colors will be described. In this example, two candidate colors are arranged side by side and displayed for all six candidate color sets obtained by selecting two candidate colors from four candidate colors. Then, the color discrimination ease d _ij between the two candidate colors ci and cj is input by the slider 162. As the color discrimination ease d _ij , five levels (easy degrees) from the most difficult level (d _ij = 1) to the easiest level (d _ij = 5) are used. However, as the color discrimination ease d _ij , one having at least three levels of the most difficult level, the easiest level, and an intermediate level thereof can be used. In the present embodiment, color discrimination Simplicity d ₁₂ colors c1 and color c2 is 1 (difficult level), color discrimination Simplicity d ₁₃ colors c1 and color c3 is 3 (middle level). In the present embodiment, the color discrimination ease input program 122 accepts input of the color discrimination ease _dij for all combinations of two colors in _M ( _two combinations of _M C).

In addition, as illustrated in FIG. 2, the M usable colors may include a plurality of achromatic colors. In this case, as an input target of the color discrimination ease d _ij , one in which one or both of the two colors ci and cj are achromatic colors may be excluded. That is, the color discrimination ease d _ij may be input only for a candidate color pair in which both the two colors ci and cj are chromatic colors. In this case, when the number of chromatic color candidate colors is K (K <M), the color discrimination easiness _dij is input for _K C ₂ candidate color pairs. In this case, a predetermined constant value (for example, zero or the easiest level) can be assigned as the value of the color discrimination ease _dij regarding the candidate color pair including an achromatic color in at least one of the candidate color pairs. .

In addition, among a plurality of candidate colors having the same hue and different densities among a plurality of chromatic colors included in the M candidate colors, only one representative candidate color is selected as the color discrimination ease d _ij . You may make it display on an input screen. In this case, as the value of the color discrimination ease d _ij for the candidate color that has not been displayed, the same value as the value for the representative candidate color that has been displayed may be used. In this way, it is possible to omit the effort of inputting the color discrimination ease d _ij .

As can be understood from these descriptions, at least a part of the M candidate colors can be selected as an input target of the color discrimination ease d _ij . However, all the chromatic color of the M candidate color if the input target color discrimination Simplicity d _ij, can grasp the color discrimination easiness d _ij more accurately.

FIG. 5 is a modified example of the input screen for the color discrimination ease displayed on the image display unit 160. In this example, the color discrimination ease input program 122 arranges one specific candidate color c1 at the center, and arranges other candidate colors c2 to c4 on the outer periphery surrounding the candidate color c1. A slider 162 for inputting the color discrimination ease is arranged between the other candidate colors c2 to c4. When the input of the color discrimination ease of the first candidate color c1 and the other candidate colors c2 to c4 is completed, the color discrimination ease input program 122 sets the color to be arranged at the center in order of the other candidate colors c2 and c3. In the same manner, the color discrimination ease _dij is input.

FIG. 6 is an explanatory diagram showing the color discrimination easiness _dij input for the four candidate colors c1 to c4. Here, the color discrimination ease _{dij of} these candidate colors ci and cj is described on a straight line between any two candidate colors ci and cj.

In step S110 of FIG. 3, the color set selection program 124, for each of the _M C _N number of colors set is created by selecting N color from among the M usable color, integrated color discrimination easiness Td is calculated. In the present embodiment, it is assumed that M = 4 and N = 3. In this case, the number of color sets is four (= ₄ C ₃ ), and four color sets G1 to G4 are formed. Candidate colors included in each of the color sets G1 to G4 can be expressed as follows, for example.
G1 = {c1, c2, c3}
G2 = {c1, c2, c4}
G3 = {c1, c3, c4}
G4 = {c2, c3, c4}

The color set selection program 124 calculates an integrated color discrimination ease Td for each of the color sets G1 to G4. The integrated color discrimination ease Td for a certain color set is an index obtained by calculation using _N C ₂ color discrimination eases _dij for the _N usable colors constituting the color set. It is an index indicating the color discrimination ease as a whole set. As the integrated color discrimination ease Td, for example, any of the following can be used.
Td = Σd _ij (1)
Td = Σd _ij ² (2)
Td = (Σd _ij ² ) ^1/2 (3)
In the above equation (1), the integrated color discrimination ease Td is given as the sum of the color discrimination ease _dij . In the above equation (2), the integrated color discrimination ease Td is given as the square sum of the color discrimination ease _dij . In the above equation (3), the integrated color discrimination ease Td is given as the square root of the sum of squares of the color discrimination ease _dij . The integrated color discrimination ease Td can also be calculated by various other calculation formulas. However, as the integrated color discrimination ease Td, it is preferable to use one having a positive correlation with the sum value of the color discrimination ease _dij . In the present embodiment, the above equation (1) is used as an equation for calculating the integrated color discrimination ease Td. In the case where color discrimination easiness d _ij only chromatic _K C ₂ sets of candidate color pair is input, color discrimination Simplicity d _ij about the candidate color pair including an achromatic in at least one of the candidate color pairs The integrated color discrimination ease Td can be calculated on the assumption that the value of is zero.

The integrated color discrimination ease Td for each of the color sets G1 to G4 is as follows.
G1: Td1 = 1 + 2 + 4 = 7
G2: Td2 = 1 + 3 + 4 = 8
G3: Td3 = 2 + 5 + 3 = 10
G4: Td4 = 4 + 4 + 5 = 13

In step S <b> 130, the color set selection program 124 selects one color set having the largest integrated color discrimination ease Td, and sets N candidate colors constituting the selected color set as usable colors. In the present embodiment, the color set having the largest integrated color discrimination ease Td is the color set G4, and the color set selection program 124 sets the three colors c2 to c4 included in the color set G4 as usable colors. . Further, the selection of the set of colors, one color conversion table of the _M C _N number of tables included in the second color conversion table 128b is selected.

When selecting a color set in step S130, there are L color sets (L is an integer equal to or greater than 1) including those whose color discrimination ease d _ij between two colors is 1 (the most difficult level). In this case, the L color sets may be excluded from the selection targets. In other words, a color set having the largest integrated color discrimination degree Td may be selected from among color sets that do not include those having a color discrimination degree _dij between two colors of 1. This is because such a color set includes colors that cannot be distinguished from each other, and thus is inappropriate as color conversion (color adjustment) for improving the ease of color identification.

  In step S <b> 140, an image displayed on the image display unit 160 is input to the smartphone 10. This input image may be an image including more colors than the M candidate colors, such as a full-color image (RGB 24-bit color image) and a high-color image (RGB 15-bit color or RGB 16-bit color image). Normally, the input image is an image that can include any color. In step S150, the color conversion program 126 reduces the color of the input image to N usable colors using the selected color conversion tables 128a and 128b. In the above-described example, since the color set G4 composed of the three usable colors c2 to c4 is selected in step S130, the colors of the input image are the three usable colors c2 to c4 here. Converted to either. In practice, it is preferable to use a larger value (for example, 16 or more) as the number N of usable colors.

  The candidate color c1 (also referred to as “unused candidate color”) that has not been selected as the usable color among the candidate colors c1 to c4 is the unused candidate among the N usable colors c2 to c4. It is converted into any color (c3 or c4) excluding the color c1 and the color that cannot be distinguished (color c2 in the example of FIG. 4). At this time, the color after conversion of the non-use candidate color c1 is the color having the smallest color difference between the non-use candidate color c1 and the non-use candidate color c1 and the usable colors c3 and c4. You can choose. In this case, when the image after color conversion is viewed, it is difficult to cause a sense of incongruity. In addition, as a color after conversion of the non-use candidate color c1, an arbitrary color considering the ease of identifying the color area on the image among the usable colors c3 and c4 that can be distinguished from the non-use candidate color c1 is used. You may make it convert into a usable color (for example, the gray color of a specific intermediate gradation). In this case, the converted image can be easily seen. In step S160, the image display program 130 displays an image reproduced using the N usable colors on the image display unit 160.

  FIG. 7 is an explanatory diagram illustrating an image display example in the present embodiment. The upper row shows before color conversion and the lower row shows after color conversion. Here, Nigeria and the Italian flag are illustrated. The color of the Nigerian national flag is a color scheme that sandwiches white with green. The color of the Italian flag is a color scheme in which white is sandwiched between green and red. When a person who does not have difficulty in color discrimination sees this, each color appears to be properly discriminated as shown in the upper left figure. On the other hand, when people who have difficulty in color discrimination, such as people with P-type color vision, see red and green, as shown in the upper right figure, the flags of Nigeria and Italy are almost identical. May appear color. That is, in relation to the above description, red corresponds to one of the candidate colors c1 and c2 in FIG. 6, and green corresponds to the remaining candidate colors c1 and c2. Note that whether red and green correspond to candidate colors c1 and c2, respectively, depends on the degree of color discrimination with other candidate colors c3 and c4. In the present embodiment, it is assumed that red corresponds to the candidate color c1 and green corresponds to the candidate color c2. The color conversion program 126 converts the original image into an image using only the usable colors c2 to c4 by color conversion. At this time, red (non-use candidate color c1) is converted into one of the usable colors c2 to c4. The lower left figure illustrates the Nigerian and Italian flags after color conversion. The lower right figure shows how a person who has difficulty in color discrimination looks when viewing the lower left figure. As shown in the lower right figure, even people who have difficulty distinguishing colors can distinguish between the Nigerian and Italian flags. Note that red (non-use candidate color c1) may be converted to an achromatic color.

  In the above description, the number M of candidate colors is 4 and the number N of usable colors is 3. However, generally, the number M of candidate colors is 3 or more, and the number N of usable colors is M. It can be a smaller natural number.

  FIG. 8 is a modification of the input screen for the color discrimination ease displayed on the image display unit 160 when M = 9. As shown in FIG. 4, a specific color c1 is arranged at the center, other colors c2 to c9 are arranged on the outer periphery surrounding the color c1, and color discrimination is performed between the colors c1 and c2 to c9. A slider 162 for inputting the degree of ease is arranged. Even if the number of colors is large, the same input is possible.

  As described above, according to the first embodiment, for each of M candidate colors selected in advance, the user is allowed to input the color discrimination ease with other candidate colors, and based on the color discrimination ease, Since a color set (N usable colors among M candidate colors) is selected, it is possible to easily select N usable colors.

Second embodiment:
FIG. 9 is an explanatory diagram showing color conversion of the user interface screen in the second embodiment. In the first embodiment, the example in which the input image that can include any color is subjected to color conversion has been described. In the second embodiment, color conversion of an image composed of only a small number of known colors is performed instead of color conversion of an input image that can include an arbitrary color. The hardware configuration of the second embodiment is the same as that of the first embodiment. This user interface screen is, for example, a game operation screen. In this game, a plurality of differently colored parts BL are used, and parts BL of the same color are arranged according to a predetermined rule to erase parts BL one after another. Only a small number of predetermined colors (for example, four colors c1 to c4) are used as the color of the component BL. However, before color conversion, when a person with difficulty in discrimination observes, it may be impossible to discriminate components BL having different colors (for example, colors c1 and c2). In the second embodiment, color conversion is executed so that a person who has difficulty in discrimination can discriminate a component BL having a different color for an image composed only of such known colors. At this time, the color of the component BL is used as a candidate color. An achromatic color may be included in the candidate colors. Since the color conversion procedure in the second embodiment is the same as the procedure in the first embodiment shown in FIG. 3, the description thereof is omitted here.

  Note that the user interface screen that is the target of color conversion in the second embodiment may be an operation screen including icons. In particular, the icon displays the contents of the program in an easy-to-understand manner with diagrams and pictures, so if the colors are confused and the icon design cannot be discriminated, the contents of the program become difficult to understand and the color discrimination becomes difficult. A situation may occur in which a difficult person is difficult to operate. According to the second embodiment, it is possible to prevent such a situation from occurring.

  The second embodiment also has the same effect as the first embodiment. In the second embodiment, color conversion is performed on an image composed only of known colors so that persons with difficulty in discrimination can discriminate components BL having different colors from each other. M can be limited to only known colors of the component BL, and the capacity of the color conversion table can be reduced. In addition, the effect of color conversion that facilitates color discrimination can be achieved more reliably.

  The embodiments of the present invention have been described above based on some embodiments. However, the embodiments of the present invention described above are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the spirit and scope of the claims, and it is needless to say that the present invention includes equivalents thereof. In the first embodiment, the color conversion is performed on the image input to the image display device 160, but the color conversion may be performed on the image stored in the image display device 160. Further, the color-converted image is not necessarily used for display, and may be used for printing an image in a printing apparatus. In this case, color conversion is performed by an application such as a printer driver, and an image is printed by a printing apparatus. Further, the color conversion program may be built in a personal computer or a printing apparatus. In addition, color conversion may be performed by a color conversion terminal incorporating a color conversion program. Further, the color-converted image may be used for both display and printing.

・ Modification 1:
In the above embodiment, at least a part of the functions realized by software may be realized by hardware, or at least a part of the functions realized by hardware may be realized by software. Specifically, for example, some or all of the various programs 122, 124, 126, and 130 shown in FIG. 1 can be realized by a hardware circuit.

Modification 2
In the above-described embodiment, the example in which the smartphone 10 is used as the image display device has been described. However, as the image display device, other various devices (for example, a touch pad and a notebook computer) can be used. The present invention is also applicable to displaying an image on a user interface for a printing apparatus. As a display device that displays a user interface for the printing apparatus, an operation panel of the printing apparatus itself or a display unit of a host computer (for example, a personal computer) of the printing apparatus can be used. The present invention can also be applied to processing that limits colors used when printing in a printing apparatus to only usable colors. In this case, the color of the input image to be printed is converted into N usable colors, and an image using only the N usable colors is printed by the printing apparatus. This color conversion can be executed by the host computer of the printing apparatus or the printing apparatus itself.

    DESCRIPTION OF SYMBOLS 10 ... Smartphone 20 ... Printing apparatus 100 ... CPU 110 ... RAM 120 ... Non-volatile memory 122 ... Color discrimination ease input program 124 ... Color set selection program 126 ... Color conversion program 128 ... Color conversion table 128a ... First color conversion table 128b ... second color conversion table 130 ... image display program 150 ... image input unit 160 ... image display unit 162 ... slider 170 ... wireless communication unit 180 ... telephone communication unit 200 ... CPU 210 ... RAM 220 ... nonvolatile memory 222 ... easy color discrimination Degree input program 224 ... color set selection program 226 ... color conversion program 228 ... color conversion table 230 ... print program 250 ... image input unit 260 ... printing unit 270 ... wireless communication Part 280 ... the operation unit

Claims (9)

A program for selecting N usable colors (N is an integer of 2 or more and smaller than M) from M (M is an integer of 3 or more) candidate colors used for displaying or printing an image. ,
A function of presenting at least some candidate colors among the M candidate colors;
A function of accepting an input of a color discrimination ease with the other candidate colors presented for each presented candidate color;
A function of selecting N usable colors from M candidate colors based on the color discrimination ease;
A program that runs a computer. The program according to claim 1,
The function of selecting the usable color is such that, when there is a color discrimination ease having a level indicating a combination of candidate colors that cannot be discriminated, among the color discrimination eases among the presented candidate colors. of _M C _N number of colors set including N color in number of candidate colors, L pieces comprise a combination of indistinguishable candidate color (L is an integer of 1 or more), except the color set of _(M C _N -L) includes a function of selecting one color set from among the color sets based on the color discrimination ease and setting N colors included in the one color set as usable colors. ,program. The program according to claim 1, further comprising:
A function of converting the color of the image into the N usable colors;
A program that makes a computer realize. In the program according to claim 3,
The color conversion includes converting (MN) candidate colors that are not used in the color conversion into usable colors having the smallest color difference among the N usable colors. In the program according to claim 3,
The color conversion includes converting (MN) candidate colors that are not used in the color conversion into usable colors that are achromatic colors. The program according to any one of claims 3 to 5, further comprising:
A function of displaying an image color-converted using the N usable colors on an image display unit;
A program that makes computers realize. The program according to any one of claims 3 to 5, further comprising:
A function of causing a printing apparatus to print an image that has been color-converted using the N usable colors;
A program that makes computers realize. A method for selecting N usable colors (N is an integer greater than or equal to 2 and less than M) from M (M is an integer greater than or equal to 3) candidate colors used for displaying or printing an image, ,
Presenting at least some candidate colors among the M candidate colors;
For each of the presented candidate colors, receiving an input of color discrimination ease with the other presented candidate colors;
Selecting N usable colors from M candidate colors based on the color discrimination ease;
A method comprising: An image display device,
An image display unit for displaying an image;
A control unit for controlling the display of the image,
The controller is
Presenting at least some candidate colors among M (M is an integer of 3 or more) candidate colors used for displaying or printing the image;
For each of the presented candidate colors, an input of color discrimination ease with the other presented candidate colors is accepted,
Based on the color discrimination ease, N usable colors are selected from the M candidate colors,
Displaying the image that has been color-converted using the N usable colors on an image display unit;
Image display device.

Images