JPH0830771A - Color solid cross section displaying method - Google Patents

Abstract

PURPOSE:To enable the comparison of a color reproducing range by display common to a CRT and a printer device to handle uniform color space by displaying the cross section of a color solid. CONSTITUTION:When a lightness index L* and the presence of the display outside a color area are designated (step S101), a minimum value is set to color quality indexes a* and b* (step S102), and whether the display is the one outside the color area or not is judged (step S103), and in the case that the display outside the color area is not to be executed, it is judged whether the present coordinates (L*, a*, b*) in the color space are inside or on the color area or not (step S104), and if the present coordinates are located inside or on the color area, a unit rectangle (DELTAa*XDELTAb*) consisting of a single color to be determined by the present coordinates is displayed at the position of the present coordinates (step S109). If the present coordinates are located inside the color area, the display of the unit rectangle is skipped. The cross section of the color solid is displayed by repeating the display of the unit rectangle while increasing the color quality indexes a* and b* to a maximum value by every DELTAa* and DELTAb* portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying a cross section of a color solid, and more particularly to a color for displaying a horizontal cross section and a vertical cross section of a color solid using a uniform color space as a color system for displaying an object color. The present invention relates to a method for displaying a three-dimensional cross section.

[0002]

2. Description of the Related Art In the color system for displaying an object color, the International Commission on Illumination (hereinafter referred to as CIE) is used as a perceptually uniform color system.
CIE1976 (L ^* a)
^* b ^* ) The color system is most widely used in color research and industry. As a color reproduction technique using this L ^* a ^* b ^* color system, there is, for example, Japanese Patent Application Laid-Open No. 4-277978, and in this example, red, green and blue (hereinafter abbreviated as RGB) of input signals are used. A method of performing processing after converting to L ^* a ^* b ^* is adopted.

As another example, in Chapter 4.8 of the Postscript Language Reference Manual Second Edition (Adobe Systems Co.), L ^* a ^* b ^* signals are directly input and the XYZ values (three Processing is performed after conversion to stimulus values).

[0004]

In the above-mentioned conventional technique, by using the L ^* a ^* b ^* color space, a perceptually uniform color space, that is, for example, a CRT (Cathode R) is used.
ay Tube) It is possible to obtain a ruler common to each device that does not depend on the characteristics of the screen or the printer, but the color reproduction range differs between the CRT and the printer, and the color reproduction range also differs depending on the individual devices of the CRT and the printer. There is a problem that the final color reproduction range cannot be confirmed without actually displaying or printing.

Further, in the prior art, a method for displaying or printing common to each device has not been obtained, but a boundary (color gamut) of a color reproduction range different for each device is actually displayed for comparison. It was difficult to do.

In view of the above points, an object of the present invention is to make it possible to display horizontal and vertical cross sections of any one or more planes of a color solid showing a color reproduction range in a uniform color space. It is an object of the present invention to provide a method for displaying a cross section of color solids so that the color reproduction ranges can be compared on a display common to CRTs and printers that handle space.

Another object of the present invention is to selectively display horizontal and vertical cross sections of any one surface or a plurality of surfaces of a color solid showing a color reproduction range in a uniform color space, together with boundary lines of the color gamut. It is an object of the present invention to provide a method for displaying cross sections of color solids, which enables comparison of color reproduction ranges on a display common to CRTs and printers that handle uniform color spaces.

[0008]

According to the method for displaying a cross section of a color solid of the present invention, three indexes for determining a uniform color space are used in the method for displaying a cross section of a color solid using a uniform color space. In the first step of designating the value of one of the indexes, and in the plane where the two indexes excluding the index with the specified value extend and decrease the values of the two indexes for each unit rectangle, the three indexes are colored. A second step of determining whether or not it is located within the gamut and the gamut, and displaying a unit rectangle consisting of a single color determined by the three indexes if the three indexes are located within and above the gamut The second step, including the step of
The step 3 and the step 3 are repeated from the minimum value to the maximum value of the two indexes to display the cross section of the color solid.

Further, the method for displaying a cross section of a color solid according to the present invention is
Whether to display a color solid cross section using a uniform color space in the color solid cross section display method by specifying a value of one of three indexes for determining the uniform color space and displaying the color gamut outside the gamut The first step of designating and the three exponents are located in and on the gamut while increasing / decreasing the values of the two exponents for each unit rectangle on the plane defined by the two exponents excluding the exponent having the specified value. The second step of determining whether or not, and 3 if the three indexes are located in and on the color gamut when it is specified in the first step not to display the color gamut
A third step of displaying a unit rectangle consisting of a single color determined by two indexes, and a specific color if the three indexes are located in the gamut when it is specified to display the out-of-gamut in the first step And a fourth step of displaying a unit rectangle consisting of a single color determined by the three indexes if the three indexes are not located in the color gamut, and the second step and It is characterized in that the third step or the fourth step is repeated from the minimum value to the maximum value of the two indexes to display the cross section of the color solid.

[0010]

The present invention will be described in detail with reference to the drawings.

FIG. 6 is a circuit block diagram illustrating a hardware configuration of an information processing system (hereinafter, simply referred to as a system) to which the method for displaying a cross section of a color solid of the present invention is applied. This system includes a communication line 1 for connecting this system to another system, an interface section 2 for controlling the connection, and a ROM (Read Only Memory).
y) 3 and RAM (Random Access Me)
4) and a CPU (Central Process)
5 and SCSI (Small)
Computer System Interfac
e) 6, hard disk device 7, colorimeter controller 8, colorimeter 9, printer engine controller 1
0, printer engine 11, CRT (Cathod
e Ray Tube) controller 12 and CRT 13
And an FD (Floppy Disk) controller 14
The floppy disk device 15, the operation unit controller 16, the keyboard 17, the pointing device 18, and the bus 19 constitute a main part thereof.

The ROM 3 includes a program section 3a in which a program for controlling the entire system is stored and CMYK.
A parameter section 3b storing constants used for (chrome, magenta, yellow, black) conversion, a matrix used for XYZ conversion, and parameters of a matrix used for calculation, and a lookup table 3c are provided.

The RAM 4 includes an input / output buffer 4a for storing data sent to and received from the interface unit 2 and a gamut value table 4 for storing gamut values (border values of the color reproduction range).
b, a work area 4c used in each processing, and a CRT
13 and a frame buffer 4d for storing image data to be displayed on the printer engine 11 or printed on the printer engine 11.

The CPU 5 performs various kinds of control, comparison, calculation, etc. according to the program stored in the program section 3a.

The hard disk device 7 is controlled by the SCSI 6 and functions as a storage unit together with the RAM 4.
The color gamut values in the color gamut value table 4b are stored in the hard disk device 7
You can also save it in.

The colorimeter 9 is controlled by the colorimeter controller 8 and functions as an input unit for measuring the print result of the printer engine 11 and the display screen of the CRT 13 and inputting the color gamut values into the color gamut value table 4b. To do.

The printer engine 11 is controlled by the printer engine controller 10 and prints out on a medium.

The CRT 13 is controlled by the CRT controller 12 and displays the output of the lookup table 3c as a color image and the cross section of the color solid 20 (see FIG. 3) based on the gamut value table 4b.

The floppy disk device 15 is controlled by the FD controller 14 and is used to take out the color gamut value of the color gamut value table 4b and to input / output the color gamut value of another printer device. The input and output of this gamut value is
It can be performed with another system by using the communication line 1 and the interface unit 2.

The keyboard 17 and pointing device 18 are controlled by the operation unit controller 16,
It is a means by which an operator operates.

The L ^* a ^* b ^* values input from the communication line 1 or the floppy disk device 15 or stored in the hard disk device 7 in advance are stored in the parameter section 3.
The RGB values calculated by using the XYZ conversion matrix of b and the calculation matrix, input to the lookup table 3c, and output from the lookup table 3c are CR.
It is displayed on the CRT 13 via the T controller 12.

FIG. 3 is a perspective view for explaining the color solid 20. Reference numeral 21 denotes the surface of the color solid 20 in the L ^* a ^* b ^* color space, that is, the color gamut. 22 is a ^* = b ^* = 0, that is, saturation =
The axis of the brightness index L ^* of 0 is shown, and the brightness index L ^* 10 is at the upper end.
0% is white, and the lower end is black with a lightness index L ^* 0%. 23 indicates the axis of the color quality index a ^* , and 24 indicates the axis of the color quality index b ^* . The axis 23 and the axis 24 are orthogonal to each other. 25 is the lightness index L ^*
A cross section of the color solid 20 cut horizontally is shown at 50% of the value of. 26 indicates a point on the color gamut 21 at a position of an angle θ from the axis of the color quality index a ^* . The color gamut 21 varies depending on the device that reproduces the color and, in the case of a printer, the color material used, and is actually a curved surface having irregularities.

FIG. 1 is a flow chart showing an example of a horizontal cross-section display procedure by a color solid cross-section display method according to an embodiment of the present invention. This procedure includes a lightness index and out-of-gamut display presence / absence designating step S101, a color quality index minimum value setting step S102, and an out-of-gamut display determination step S103.
In-gamut or upper position determination step S104, in-gamut upper position determination step S105, lightness index determination step S106, and lightness index 100% setting step S107.
A brightness index 0% setting step S108, a unit rectangle display step S109, and a color quality index maximum value determination step S108.
110, a color quality index unit increasing step S111, a color quality index maximum value determining step S112, and a color quality index minimum value setting and unit increasing step S113.

FIG. 4 is a diagram illustrating a horizontal cross section of the color solid 20 displayed under the constant value of the lightness index L ^* by the display procedure shown in FIG. Here, the color quality index a ^*
And the color quality index b ^* form Cartesian coordinates where | a ^* | _max = | b ^* | _max . In the case of the cross section 25 having the lightness index L ^* = 50% shown in FIG. 3, the broken line A-3 indicates the boundary line of the color gamut 21.

FIG. 2 is a flow chart showing an example of a procedure for displaying a vertical cross section by the color solid cross section display method according to one embodiment of the present invention. This procedure includes an angle / out-of-gamut display presence / absence specifying step S201, a color quality index / brightness index minimum value setting step S202, an out-of-gamut display determination step S203, and an in-gamut or upper position determination step S20.
4, color gamut position determination step S205, lightness index determination step S206, lightness index 100% setting step S207, lightness index 0% setting step S208, unit rectangle display step S209, and color quality index maximum value determination. Step S210 and color quality index unit increase step S211
And a lightness index maximum value determination step S212, and a color quality index minimum value setting and lightness index unit increasing step S213.

FIG. 5 is a view exemplifying a vertical cross section of the color solid 20 displayed at an angle θ = 0 through the axis (b ^* = 0) of the color quality index a ^* by the display procedure shown in FIG. Is. Here, the color quality index a ^* and the lightness index L ^* form rectangular coordinates. The minimum value of the lightness index L ^* is 0% and the maximum value is 100%.

Next, the processing procedure of the method for displaying the cross-section of the color solid of this embodiment will be described.

Before displaying the cross section of the color solid 20, the lightness index L ^* is obtained by the colorimetric measurement of the result (the screen of the CRT 13 or the printing of the printer engine 11) displayed by the device for performing the color reproduction in advance. The respective values of the color quality index a ^* and the color quality index b ^* are obtained, and the color gamut value is a combination of the lightness index L ^* , which indicates the boundary of the color reproduction range, the color quality index a ^*, and the color quality index b ^*. It is stored in the table 4b.

(1) CR is the horizontal cross section shown in FIG.
When displaying at T13 (printing if printer engine 11) (see FIG. 1)

First, when the operator specifies the lightness index L ^* = 50% and whether or not there is a display outside the color gamut 21, (step S1)
01), the color quality index a ^* and the color quality index b ^* are set to the minimum values − | a ^* | _max and − | b ^* | _max , respectively (step S102).

Next, it is determined whether or not the display outside the color gamut 21 is performed (step S103). If the display outside the color gamut 21 is not performed, the current coordinates (L ^* , a ^* , b) in the color space are determined.
^* ) Refers to the color gamut value table 4b to judge whether the position is in or above the color gamut 21 (step S10).
4), if the position of the upper or the color gamut 21 current coordinates (L ^*, a ^*, b ^*) current coordinate position of the (L ^*, a ^*, b
^* ) Unit rectangle consisting of a single color (Δa ^* ×
Δb ^* ) is displayed (step S109). Current coordinate (L
^{If *} , a ^* , b ^* ) is outside the color gamut 21 (NO in step S104), the unit rectangle is displayed (step S10).
9) is skipped (however, in the case of CRT13, the background color is displayed).

On the other hand, when it is determined in step S103 that the display outside the color gamut 21 is to be performed, the current coordinates (L ^* , a ^* ,
b ^* ) is referred to the color gamut value table 4b to judge whether or not the position is on the color gamut 21 (step S105), and if it is not on the color gamut 21, the current coordinates (L ^* , a ^* , b ^* )
Current coordinates of the position ^{(L *, a *, b} *) for displaying the unit rectangle consisting of a single color to be determined (Δa ^* × Δb ^*) (step S109). If the current coordinates (L ^* , a ^* , b ^* ) are on the color gamut 21, it is determined whether the lightness index L ^* is less than 50% or more (step S106). Only for color, L ^* = 0% (black) is set (step S107), and the current coordinates (L ^* , a ^* ,
A unit rectangle (Δa ^* × Δ) with a solid black color at the position of b ^* )
b ^* ) is displayed (step S109). Lightness index L ^*
If is less than 50%, L ^* = 100% only for color
It is set to (white) (step S108), and a unit rectangle (Δa ^* × Δb ^* ) of a single white color is displayed at the position of the current coordinates (L ^* , a ^* , b ^* ) (step S109).

After displaying the unit rectangle, or skipping
Color quality index a^*Is the maximum value | a^*｜_maxAnd above
It is determined whether or not (step S110), the color quality index a
^*Is the maximum value | a^*｜_maxOtherwise, color index a^*To
Δa^*Increase by the amount (step S111),
Control is returned to step S103. Color quality index a^*Is the maximum value | a ^*
｜_maxIf it is above, the color quality index b^*Is the maximum value | b^*｜
_maxIt is determined whether or not the above (step S11
2), maximum value | b^*｜_maxOtherwise, color index a^*
Is the minimum value- | a^*｜_maxSet to color quality index b^*Δb^*
Increase by the amount (step S113), and step S1
Return control to 03. In step S112, the color quality index b^*But
Maximum value | b^*｜_maxIf so, the process ends.

As a result of the above processing, as shown in FIG. 4, in the horizontal plane of the color solid 20 having the lightness index L ^* = 50%, the color quality index a ^* has the minimum value − | a ^* | _max , Further, the unit rectangle A-1-1 is displayed at the position of the minimum value − | b ^* | _max of the color quality index b ^* , and then only the color quality index a ^* is Δa.
The maximum value of the color quality index a ^* is increased one after another such that the unit rectangle A-1-2 is displayed by increasing by ^* minutes | a ^* | _max
A unit rectangle is displayed at positions up to. Next, the color quality index a
^* Is the minimum value − | a ^* | _max and the color quality index b ^* is Δb ^*.
Min so as that only displays the unit rectangle A-2-1 is increased, the color quality indices a ^* is the maximum value | a ^* | _max, and color quality index b ^* is the maximum value | b ^* | to the position of the _max Display a unit rectangle. However, when it is specified that the outside of the color gamut 21 is not displayed, the unit rectangle outside the color gamut 21 is not displayed (the background color is displayed on the CRT 13). Also, color gamut 2
When it is specified to display outside 1, the outside of the color gamut 21 is also displayed, but the unit rectangle connection on the color gamut 21 is displayed in white or black as the boundary line A-3. Lightness index L
^* Is 100%, that is, black in a section close to white, lightness index L
^* Is 0%, that is, white is displayed in a cross section close to black.

By performing the same display while changing the value of the lightness index L ^* , it is possible to display a horizontal cross section at an arbitrary horizontal position of the color solid 20. Also, the brightness index L ^*
By continuously changing the value of, it is possible to continuously display a plurality of cross sections. Furthermore, by adjusting the size of the display, the CRT13 can be displayed within one screen.
The printer engine 11 can display a plurality of cross sections on one printing sheet.

(2) The vertical cross section shown in FIG.
When displaying at T13 (printing with printer engine 11) (see FIG. 2)

First, when the operator specifies whether the angle θ = 0 and whether or not there is a display outside the color gamut 21 (step S201), the color quality index a ^* is the minimum value − | a ^* | _max and the lightness index L ^* is 0. %, Respectively (step S202).

Next, it is determined whether or not the display outside the color gamut 21 is performed (step S203). If the display outside the color gamut 21 is not performed, the current coordinates (L ^* , a ^* , b ^* ) are the colors. By referring to the gamut table 4b, it is determined whether or not the position is in or above the color gamut 21 (step S204), and if it is in or above the color gamut 21, the current coordinates (L ^* , a ^* , b). ^*) current coordinates (L ^* at the position of, a ^*, b ^*) for displaying the unit rectangle consisting of a single color to be determined (.DELTA.a ^* × [Delta] L ^*) (step S209). If the current coordinates (L ^* , a ^* , b ^* ) are outside the color gamut 21 (No in step S204), the display of the unit rectangle (step S209) is skipped (however, in the case of CRT13, the background color). Is displayed).

On the other hand, when it is determined in step S203 that the display outside the color gamut 21 is to be performed, the current coordinates (L ^* , a ^* ,
(b ^* ) refers to the color gamut value table 4b to determine whether or not the position is on the color gamut 21 (step S205). If the position is not on the color gamut 21, the current coordinates (L ^* , a ^* , b ^* )
Current coordinates of the position ^{(L *, a *, b} *) for displaying the unit rectangle consisting of a single color to be determined (Δa ^* × ΔL ^*) (step S209). If the current coordinates (L ^* , a ^* , b ^* ) are on the color gamut 21, it is determined whether the lightness index L ^* is less than 50% or more (step S206), and the lightness index L ^* is determined ^.
Is less than 50%, L ^* is set to 100% (white) (step 207), and if the lightness index L ^* is 50% or more, L ^* is set to 0% (black) (step S208). ,
Current coordinates ^{(L *, a *, b} *) to display a rectangular unit formed by white or black color at a position of ^(* Δa ^* × ΔL) (step S209).

After the unit rectangle is displayed or skipped, it is determined whether the color quality index a ^* is the maximum value | a ^* | _max or more (step S210), and the color quality index a is determined.
^{If *} is not the maximum value | a ^* | _max or more, the color quality index a ^* is increased by Δa ^* (step S211), and the control is returned to step S203. Color quality index a ^* is maximum | a ^*
If | _max or more, it is judged whether or not the lightness index L ^* is 100% or more of the maximum value (step S212). If it is not 100% or more of the maximum value, the color quality index a ^* is the minimum value- | a.
^* | _Max is set, the lightness index L ^* is increased by ΔL ^* (step S213), and the control is returned to step S203. The maximum value of the lightness index L ^* is 100% in step S212.
If so, the process ends.

As a result of the above processing, as shown in FIG. 5, the color quality index b ^* of the color solid 20 and the angle θ = 0.
Minimum value of the color quality index a ^* in the vertical plane of |
^The unit rectangle B-1-1 is displayed at the position where the minimum value of ^* | _max and the lightness index L ^* is 0%, and then only the color quality index a ^* is increased by Δa ^* and the unit rectangle B-1-2. Is displayed, the unit rectangle is displayed up to the maximum value | a ^* | _max of the color quality index a ^* . Next, the color quality index a ^* is set to the minimum value − | a ^* | _max and the lightness index L ^* is increased by ΔL ^* to display the unit rectangle B-2-1.
The unit rectangle is displayed up to the position where the color quality index a ^* has the maximum value | a ^* | _max and the lightness index L ^* has the maximum value 100%. However,
When it is specified that the outside of the color gamut 21 is not displayed, the color gamut 21
Is not displayed (white is displayed on the CRT 13). When the outside of the color gamut 21 is specified, the outside of the color gamut 21 is also displayed, but the boundary line B-3 of the color gamut 21 is displayed in white or black while the outside of the color gamut 21 is displayed. Display it. A black line is displayed in a cross section where the lightness index L ^* is 100%, that is, close to white, and white is displayed in a cross section where the lightness index L ^* is 0%, that is, close to black.

By the way, by replacing the color quality index a ^* in FIG. 2 with [a ^* , b ^* ] corresponding to the angle θ,
It is possible to display a vertical cross section at an arbitrary angle θ passing through the center of the color solid 20. Here, [a ^* , b ^* ] is an array of color quality indices a ^* and b ^* , and the distance D to the axis 22 with saturation = 0 is calculated by the following equation (1) according to the angle θ. Desired.

Specifically, the point where a ^* = b ^* = 0, that is, the cross section passing through the center of the color solid 20 is the axis ± 90 of the color quality index a ^*.
It is obtained at an angle θ of 0 °, and the height of the cross section thereof is the lightness index L ^* , and therefore is constant regardless of the angle θ. Gamut 2 from the center
The distance D to the boundary line A-3 of 1 (see FIG. 4) is obtained by the equation (1) by the Pythagorean theorem as shown by the point 26 in FIG. 3 and the point A-4 in FIG.

D = (a ^{* 2} + b ^{* 2} ) ^1/2 (1)

Since FIG. 5 shows a cross section at θ = 0,
The width W in the figure is exactly | a ^* | _max × 2, but θ ≠
In the case of 0, as shown by point A-5 in FIG. 4, 45 ° ≦ |
If θ | ≦ 90 °, the equation (2) is obtained.

W = (| b ^* | _max ² + (| b ^* | _max / tan θ) ² ) ^1/2 (2)

If | θ | ≦ 45 °, the equation (3)
Becomes

W = (| a ^* | _max ² + (| a ^* | _max · tan θ) ² ) ^1/2 (3)

However, | a ^* | _max = | b ^* | _max .

By changing the angle θ in this way and performing the same display, it is possible to display a vertical cross section at an arbitrary angle θ passing through the center of the color solid 20.

When a large number of horizontal cross sections and vertical cross sections are displayed as described above, for example, pure yellow is in the color solid 20 of the L ^* a ^* b ^* color space. Then, the upper part, that is, close to white, and the angle θ =
It can be seen that there is a little more than + 90 ° and that pure red exists at an angle θ = + 30 ° slightly below the center of the color solid 20.

In the above embodiment, the uniform color space is L ^*.
Although the case of the a ^* b ^* color space has been described, the present invention is similarly applicable to other uniform color spaces such as the XYZ color space and the L ^* u ^* v ^* color space. There is no end.

Further, by displaying one or a plurality of planes of horizontal and vertical arbitrary cross sections of the color solid and displaying the boundary of the color gamut, a display common to CRTs and printers that handle uniform color space. It goes without saying that printing can be performed.

[0054]

As described above, according to the present invention, one of three indexes for determining the uniform color space is designated,
By displaying the two exponents in increments or decrements for each unit rectangle on a plane defined by two exponents excluding the exponent whose value is specified, one surface of an arbitrary cross section in the horizontal direction and the vertical direction of the color solid in the uniform color space Alternatively, it is possible to display a plurality of screens, and it is possible to perform display or printing common to a CRT that handles a uniform color space and a printer device.

Further, by designating one of the three exponents for determining the uniform color space and increasing or decreasing the two exponents for each unit rectangle in the plane formed by the two exponents excluding the exponent having the designated value. By displaying the boundary lines of the color gamut selectively while displaying sequentially, one or more surfaces of any cross section of the color solid in the uniform color space in the horizontal direction and the vertical direction can be displayed, and Borders can be displayed, display or printing common to CRTs and printers that handle uniform color spaces, and color gamuts can be easily compared by displaying and comparing color gamuts. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a flow chart illustrating a procedure for displaying a horizontal cross section by a color solid cross section display method according to an embodiment of the present invention.

FIG. 2 is a flow chart illustrating a procedure of displaying a vertical cross section by a color solid cross section display method according to an embodiment of the present invention.

FIG. 3 is a perspective view illustrating a color solid.

FIG. 4 is a diagram exemplifying a horizontal cross section of a color solid displayed by the display procedure of FIG. 1;

5 is a diagram illustrating a vertical cross section of a color solid displayed by the display procedure of FIG.

FIG. 6 is a hardware configuration diagram of an information processing system to which the color solid cross-section display method of the present invention is applied.

[Explanation of symbols]

1 Communication Line 2 Interface Part 3 ROM 3a Program Part 3b Parameter Part 3c Lookup Table 4 RAM 4a I / O Buffer 4b Color Gamut Value Table 4c Work Area 4d Frame Buffer 5 CPU 6 SCSI 7 Hard Disk Device 8 Colorimeter Controller 9 Colorimetry 10 printer engine controller 11 printer engine 12 CRT controller 13 CRT 14 FD controller 15 floppy disk device 16 operation unit controller 17 keyboard 18 pointing device 19 bus 20 color solid 21 color gamut 22 axis of saturation = 0 color index a ^* Axis 24 Color axis b ^* axis 25 Horizontal section 26 points A-1-1, A-1-2, A-2-1 Unit rectangle A-3 Color gamut boundary line A-4 From a ^* At angle θ A ^* b ^* outermost point on the orthogonal coordinate B-1-1 at an angle θ from the point A-5 a ^* in the color gamut kicking, B-1-2, B-2-1 unit rectangle B-3 colors Area border

Claims (5)

[Claims] 1. A method for displaying a cross section of a color solid for displaying a cross section of a color solid using a uniform color space, the first step of designating a value of one of three indexes for determining the uniform color space. And determining whether or not the three exponents are located within or on the gamut while increasing or decreasing the values of the two exponents for each unit rectangle in the plane formed by the two exponents excluding the exponent having the designated value. And a third step of displaying a unit rectangle composed of a single color determined by the three indexes if the three indexes are located in and on the color gamut, the second step and the third step The method for displaying a cross section of a color solid is characterized in that the cross section of the color solid is displayed by repeating the above step from the minimum value to the maximum value of the two indexes. 2. In a method for displaying a cross section of a color solid for displaying a cross section of a color solid using a uniform color space, a value of one index out of three indexes for determining the uniform color space is specified and a value outside the color gamut is specified. The first step of specifying whether or not to display, and the three indexes within the color gamut and the color while increasing or decreasing the values of the two indexes for each unit rectangle on the plane where the two indexes excluding the index with the specified value A second step of determining whether or not the color gamut is located on the gamut, and three indexes if three indexes are located within the color gamut and above the color gamut when it is specified in the first step that the color gamut is not displayed. A third step of displaying a unit rectangle composed of a single color determined by the above step; and, if three indexes are located in the color gamut when the display is out of the color gamut in the first step, a specific color is obtained. A unit rectangle is displayed, and three indices are placed on the color gamut. And a fourth step of displaying the three unit rectangle formed of a single color which is determined by the exponent to be, the second step and the third step or the fourth step 2
A method for displaying a cross section of a color solid, wherein the cross section of the color solid is repeatedly displayed from the minimum value to the maximum value of one index. 3. The uniform color space is a L ^* a ^* b ^* color space in which a lightness index L ^* is taken in the vertical direction and a color quality index a ^* and a color quality index b ^* are taken in the horizontal direction, and a single or plural number is used. 3. The method for displaying a cross section of a color solid according to claim 1 or 2, wherein the lightness index L ^* is designated to display a horizontal cross section of one or more surfaces of an arbitrary height of the color solid. 4. The uniform color space is an L ^* a ^* b ^* color space in which a lightness index L ^* is taken in the vertical direction and a color quality index a ^* and a color quality index b ^* are taken in the horizontal direction. The method for displaying a cross section of a color solid according to claim 1 or 2, wherein the cross section in the vertical direction of any one surface or a plurality of surfaces passing through the center of the color solid is displayed by designating the angle of. 5. The uniform color space is an L ^* a ^* b ^* color space in which a lightness index L ^* is taken in the vertical direction and a color quality index a ^* and a color quality index b ^* are taken in the horizontal direction. If the lightness index L ^* , the color quality index a ^*, and the color quality index b ^* are located in the color gamut when it is specified to display outside the color gamut in the process of, the above is performed when the lightness index L ^* is 50% or more. 3. The method for displaying a cross section of a color solid according to claim 2, wherein the specific color is black and the specific color is white when the lightness index L ^* is less than 50%.