JP2000020702A - Color space and color chart or color picker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a color space which can be suitably used for color management by unifying recognizable brightness on the same horizontal cross-section by making all brightness based on the human visual sense of almost the same for colors appearing on the horizontal cross-section of the color space. SOLUTION: In a first color space 10, brightness moving from the highest brightness to the lowest brightness is indicated on a central axis connecting two vertexes 11 and 12. Also, saturation is indicated from the central axis toward the outside and the highest saturated color is arranged on the circumference of a circle which is the furthest from the central axis to make it a hue circle 13. A color indicated in the hue circuit 13 is moved to an arrow A1 direction to pertinent brightness height according to brightness based on a visual sense of each color. Each moved color is connected with the two vertexes 11 and 12 so that a second color spaced 20 can be obtained. One part of the hue is compressed or extended to an arrow A2 direction to be corrected and the cross-section is shaped like a lozenge so that the second color space 20 is shaped like the bead of an abacus. Thus, a color space can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color space, a color chart, and a color picker for designating and recording colors or designing colors.

[0002]

2. Description of the Related Art Hitherto, in transmitting or recording color information, a color system that quantitatively represents colors has been employed as a means for accurately displaying colors. As the color system, there are a developed color system (a perceived color) that expresses a color according to the appearance of an object color, and a color mixture system (a psychophysical color) that represents light from a light source or light reflected from an object as a numerical value.

[0003] Among the above color systems, the developed system expresses an object color by quantitatively classifying colors according to three psychological attributes of color perception (hue, lightness, and saturation). In the color developing system, since the object color is represented as a three-dimensional color solid, it is used for performing visual color design such as various designs. Representative examples of the color developing system include the Ostwald system shown in FIG. 11 and the Munsell system shown in FIG.

In the Ostwald system, a color solid is constructed by a mixture of three elements, all of which are ideal black, ideal white, and perfect color (pure color). 5 colors of green, blue and purple, 0-1
It is constructed by assembling a color solid based on 0 levels of brightness and 0 to 15 levels of saturation.

[0005]

However, in the Ostwald system, the perceived brightness at each brightness is not uniform. That is, although the brightness of a color appearing on a cross section of a plane perpendicular to the central axis connecting two vertices of the color space is constant based on a certain standard as a physical quantity, it is determined as lightness by human vision. Are not the same, it is difficult to specify colors having the same lightness in different hues in performing color design and simulation.

Further, the Munsell system has a configuration in which the perceived lightness in each lightness is made uniform. However, since the Munsell system is asymmetric with respect to the central axis, there is a problem that it is difficult to compare two colors.

[0007] Further, with the recent development of computer technology, color design by computer has been performed. 2. Description of the Related Art Conventionally, a color picker is mounted on a computer system or computer software, and is configured to detect a desired color from a color palette of the color picker. The conventional color picker employs a method of displaying a horizontal cross section of a color space formed in, for example, a cube or a column.

However, the color space in the conventional color picker is designed based on the composition of the primary colors, and does not indicate a position code of three attributes arranged in a three-dimensional color space. For this reason, when the user performs work such as coloring,
It has been difficult to find a comparison and harmony of the three attributes in the color solid space.

Several color spaces other than those described above have been proposed, but all of them lack convenience for the color arrangement side, and have not yet become a common system.

[0010] Further, with the expansion of networks accompanying computerization, there is a demand for a color system capable of transmitting color information between different computer systems or mutually performing data conversion. But now, OS,
Since color definitions are unified depending on systems, applications, and the like, it is difficult to perform color matching between different models.

In order to achieve color matching between the above-mentioned different models, research is being conducted on using a Lab system, which is a uniform perceived color space of the CIE color system, as a standard in models aiming at realizing high-quality graphics. ing. However, it is difficult to realize sufficient observation conditions for the Lab system to show an accurate value, and there is a drawback that the measured value has many errors due to instruments. It is not a system that can be used only by a specific closed high-end model, but a multi-computer can transmit color data among each other, and is a simple and comprehensive system that includes the concept of three attributes of color, three primary colors, and complementary colors. It is desired to build a color model with many characteristics.

It is an object of the present invention to provide a color space, a color chart, and a color picker that can unify recognition brightness in the same horizontal section of a color space and can be suitably used for color management.

It is another object of the present invention to provide a color space, a color chart, and a color picker which include the three attributes of color and the concept of complementary colors and can be used in common between different computer systems.

[0014]

The above object is achieved by the technical means described in the claims. In addition,
In the present specification, “RGB, which are the three primary colors of color light”, are R (red), G (green), and B (blue), respectively.
"CMY which is the three primary colors of the color material" indicates C (cyan), M (magenta), and Y (yellow), respectively. Achromatic white is represented by W, and black is represented by K.

According to the first aspect of the present invention, in a color space for specifying colors expressed on various display media, one vertex has the highest brightness and the other vertex has the lowest brightness. And a color space in which the degree of tint increases outward from a central axis connecting the two vertices, and a cross-sectional shape of a vertical plane passing through the central axis is a rhombus. The colors appearing on the cross section of the plane perpendicular to the central axis can be solved by making the lightness of human vision substantially the same.

As described above, in the color space of the present invention, the visual lightness of the color represented by each lightness is unified, and all colors are arranged symmetrically with respect to the central axis. Can be easily specified and compared, and various color designs and simulations can be smoothly and appropriately performed.

The color space is formed, for example, as follows. The color space is obtained from a first color space and a second color space obtained by transforming the first color space. The first color space is a color in which one vertex has the highest lightness and the other vertex has the lowest lightness, and the degree of shade increases outward from a central axis connecting these two vertices. Space.
In the first color space, one point on the central axis that is equidistant from two vertices is the center, and the lightness indicated by one point on the central axis is located on the circumference of a circle farthest from the central axis. The configuration is such that the highest saturation color is arranged.

First, the highest chroma color in the first color space is moved to the position of the corresponding lightness on the central axis according to the lightness. Next, a second color space is formed by connecting the two vertices and the moved colors. Then, the color space of the present invention is formed by compressing or expanding a part of the color in the second color space in the saturation direction and making the cross-sectional shape of the vertical plane passing through the central axis into a rhombus.

According to a second aspect of the present invention, in the color chart for specifying colors expressed on various display media, one of the vertices is set to the highest brightness and the other is set to the lowest brightness. An achromatic color chart showing lightness that increases and decreases at equal intervals on a central axis connecting vertices, and a chromatic color chart showing saturation increasing at equal intervals outward from the central axis. In the chart, the shape of the cross section of the vertical plane passing through the central axis is a rhombus, and the color charts appearing on the cross section of the plane orthogonal to the central axis have substantially the same lightness as seen by human eyes. It is characterized by the following.

According to a third aspect of the present invention, there is provided a color picker for displaying a color space according to the first aspect, wherein the color picker stores a color palette and color data corresponding to the color palette. A point of the detection target portion is designated by using the color palette as a detection target portion, and color data corresponding to the one point is detected from the color data and displayed.

According to a fourth aspect of the present invention, there is provided a color picker displaying the color chart according to the second aspect, wherein the color picker stores a color palette and color data corresponding to the color palette. And specifying one point of the detection target portion using the color palette as a detection target portion, and detecting and displaying color data corresponding to the one point from the color data.

By using the color picker of the present invention configured as described above on a computer display or the like, the color space or the color chart of the present invention can be effectively used in actual color design and color simulation. Can be. At this time, the color palette shown in the color picker can display colors having substantially the same lightness in each lightness, so that it is easy to specify and compare colors, and the color palette is easy for the user to use. I have.

The color palette may be a plane parallel to the center axis of the color space or color chart displayed on the color picker, a plane perpendicular to the center axis of the color space, or an umbrella from the center axis of the color space. It is configured to be represented by at least one of the expanding surfaces. As described above, the color picker of the present invention can display a desired portion of the color space according to the application, and can respond to various needs of the user.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A color space 1 according to the present invention is a color space for specifying colors expressed on various display media. That is, the color space 1 is printed and displayed on paper or displayed on the display 3 of the computer.
The color space 1 shows brightness with one vertex as the highest brightness and the other vertex as the lowest brightness. Further, the degree of color tone is increased outward from the central axis connecting the two vertices to indicate saturation.

The color space 1 has a rhombic cross-section in a vertical plane passing through the central axis, and the colors appearing on the cross-section in a plane perpendicular to the central axis have substantially the same lightness as seen by human eyes. Is configured.

In the color chart of the present invention, one vertex is set to the highest lightness, the other vertex is set to the lowest lightness, and the lightness that increases and decreases at equal intervals on the center axis connecting the two vertices is represented by an achromatic color chart. Represents. Further, the saturation increasing outward at regular intervals from the central axis is represented by a chromatic color chart. The color chart is configured so that the cross-sectional shape of the vertical plane passing through the central axis is rhombic, and the color charts appearing on the cross-section of the plane orthogonal to the central axis are all substantially the same in lightness to human eyes. ing.

Further, the color picker 2 using the color space 1 or the color chart according to the present invention comprises a color palette 2a.
And color data 2b corresponding to the color pallet. The color pallet 2a is designated as a detection target portion, and one point of the detection target portion is designated. Color data corresponding to this point is detected from the color data 2b and displayed. Is what you do.

The color pallet 2a is represented by a plane parallel to the center axis of the color space 1 or the color chart, a plane perpendicular to the center axis, or a plane spreading umbrella from the center axis.

[0029]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 10 show an embodiment according to the present invention. FIG. 1 is an explanatory diagram showing a procedure for forming a color space of the present invention from a first color space and a second color space. FIG. 2 is an explanatory view showing a display image of the color picker of the present invention, and FIG.
FIG. 4 is a block diagram showing a configuration of a color picker, FIG. 4 is a graph showing lightness values obtained by calculation, FIG. 5 is a graph comparing lightness values obtained by calculation formulas and lightness values in the Munsell system, and FIGS. FIG. 9 is an explanatory diagram for explaining a procedure for obtaining the coordinate value of a corresponding point io in the Ostwald color space from the coordinates of the point i specified in the color space according to the present invention, and FIG. 10 is obtaining the RGB values of the point io. FIG.

The color space 1 of the present invention is a so-called Soloban ball shape in which two cones having the same base area and height are joined at the bottom surface. The upper vertex is the highest brightness, the lower vertex is the brightness 0, It is configured to display a saturation that increases outward from the central axis connecting these two vertices in accordance with the degree of color tone.

Further, the color space 1 of the present invention is configured such that the colors appearing on a plane perpendicular to the central axis have substantially the same visual lightness.

The method of forming a color space according to the present invention configured as described above will be described. As shown in FIG. 1, the color space of the present invention is obtained by correcting the first color space indicated by reference numeral 10 to obtain a second color space indicated by reference numeral 20. Further, it is obtained by correcting so as to have a soloban ball shape.

The color space 10 is, for example, an Ostwald color space in which one vertex 11 has the highest lightness and the other vertex 1
2 is the lowest lightness, and the lightness transitioning from the highest lightness to the lowest lightness on the central axis connecting the two vertices 11 and 12 is shown. The saturation is shown outward from the center axis, and the saturation is configured to increase outward.

The maximum saturation color is arranged on the circumference of a circle that is the center of a circle that is equidistant from the two vertices 11 and 12 and that is farthest from the center axis to form a hue circle 13. ing. On the color wheel, for example, opposite colors such as yellow and blue-violet, and red and indigo are arranged to face each other.

Next, the colors shown in the hue circle 13 are moved to the corresponding lightness levels according to the visual lightness of each color. The lightness is shown with the highest lightness (white) as 10 and the lowest lightness (black) as 0. The visual lightness of each color is obtained by the following equation. In the expression, Lθds is the brightness (0-10) of the outer periphery at the θ hue position of the color space 1, and θ
(0-2π: unit radian) is an angle in the counterclockwise direction with Y 'as the origin, and indicates hue.

[0037]

(Equation 1)

For example, since Y is θ = 0, lightness = 7.9594 is obtained by substituting θ = 0 into the above equation. Further, for example, since B has an angle of π (3.14) from Y, θ = 3.14 is substituted to obtain lightness = 2.0664. In order to verify the accuracy of the above formula, the brightness value obtained by the calculation is compared with the brightness value in the Munsell system. First, a graph shown in FIG. 4 is obtained from the brightness of each color obtained by the calculated value. FIG. 4 shows a half circumference of the hue,
That is, lightness in the range of θ (hue) = 3.5 is shown.

FIG. 5 shows a lightness graph obtained by a calculation formula,
It is a comparison with the brightness graph in the Munsell system. It can be seen that there is almost no difference between the brightness value obtained by the calculation and the brightness value in the Munsell system.

As described above, the brightness value of each color on the hue circle 13 is obtained from the above equation, and each color is moved to the corresponding height based on the brightness value as shown in FIG. In FIG. 1, the moving direction is indicated by an arrow A.
It is shown as 1. Then, the second color space 20 is obtained by connecting each moved color and the two vertices.

Next, the second color space 20 is corrected so as to have a so-called Soloban ball shape in which two cones having the same bottom area and height are joined at the bottom. At this time, as shown in FIG. 1, a part of the hue is corrected by being compressed or expanded in the direction of arrow A2. Thus, the color space 1 of the present invention is formed.

Next, a method of calculating coordinates in the Ostwald color space corresponding to a predetermined color in the color space 1 will be described. This makes it possible to know where the predetermined color in the color space 1 is located in the Ostwald color space. That is, by obtaining the position in the Ostwald color space, the color space 1 can be compared with the Ostwald color space, and information such as complementary colors obtained from the Ostwald color space can be used. Also, as described below,
The RGB mixing ratio at point i can be determined.

First, the coordinates of a point i indicating a predetermined color in the color space 1 are defined. As shown in FIG. 6, the point i is specified in the color space 1. The coordinates of the point i are defined as (lightness, hue, saturation) = (Li, θi, ri). Note that Ri in the figure is the horizontal distance from the center axis of the point i, and RLi is
This is the radius of a circle that appears in a cross section when the color space 1 is cut horizontally with the lightness Li. The saturation ri can be obtained from the following equation.

[0044]

(Equation 2)

Next, the L value (Lθri) at the saturation ri position of the straight line f (θi) is obtained. As shown in FIG. 7, the straight line f (θi) extends from the position corresponding to the brightness 5 of the central axis, and the lower vertex 1a of the color space 1 and the hue circle 1 of the color space 1
This is a straight line parallel to a line connecting one point on b. L value (Lθ
ri) is obtained by the following equation.

(Equation 3)

The L value (Lθri) obtained from the above equation is compared with the lightness Li value at the point i. As shown in FIG.
When the i value is equal to or larger than the Lθri value, the lightness (Lio) of the point i corresponding to the Ostwald color space io of the point i can be obtained from the following equation.

[0047]

(Equation 4)

Further, the L value (Lθri) and the lightness Li of the point i
When the Li value is less than the Lθri value as shown in FIG. 9, the lightness (Lio) of the point i corresponding to the Ostwald color space of the point i can be obtained from the following equation.

[0049]

(Equation 5)

The saturation rio of the point io is defined by the following equation. Note that Rio is the horizontal distance from the center axis of the point io, R
Lio is the radius length of a circle appearing in a cross section when the color space is cut horizontally with lightness Li.

[0051]

(Equation 6)

Next, a method of obtaining the RGB values of the point io indicating a predetermined color in the Ostwald color space will be described. By obtaining the RGB values of the point io, the RGB values of the corresponding point i in the color space can be specified.

FIG. 10 is an explanatory diagram showing how to obtain the RGB values of the point io. In the figure, the symbol RLio is the brightness Li of the point io.
It is the distance from the central axis of the outer periphery of the horizontal section of the Ostwald color space at o, and the symbol Rio is the distance from the central axis of the point io. First, the RGB mixing ratio Ma (R, G, B) at the point a shown in FIG. Here, RGB values are all in the range of 0-1.

[0054]

(Equation 7)

Next, the RGB mixture ratio Mb (R, G, B) of the point b indicating the complementary color of the point a is obtained from the above RGB values by the following equation.

[0056]

(Equation 8)

Further, the RGB mixture ratio Mc (R, G, B) of the point c corresponding to the point io and located at the position of the lightness 5 is obtained by the following equation.

(Equation 9)

The RGB mixing ratio Ma of the points a, b and c
(R, G, B), Mb (R, G, B), Mc (R, G,
From B), the RGB mixture ratio Mio (R, G, B) at the point io
Is determined by the following equation. Here, the RGB mixing ratios M10 (R, G, B) and M0 (R,
G, B) are respectively M10 (R, G, B) = (1,
1,1), M0 (R, G, B) = (0,0,0).

[0059]

(Equation 10)

Further, from the above RGB mixing ratio, L * a * b
* Value may be determined and displayed as L * a * b *. First, RGB correction is performed by the following equation.

[Equation 11]

The R'G'B 'value obtained from the above equation is converted into an XYZ value by the following equation.

[0062]

(Equation 12)

From the XYZ values, L * a
Find the * b * value. Here, Xn, Yn, and Zn are the values of X, Y, and Z when R '= B' = G '= 1.

[0064]

(Equation 13)

When the color space is represented by a color chart, for example, a digital color system chart that has been applied by the present applicant is used. This digital color system chart has a brightness / saturation level of 1
The combination is such that the number of hues increases by a multiple of 6 each time the number of steps increases. The chart for the digital color system is represented by the following equation.

[0066]

[Equation 14]

The above equation shows the total number of colors when the three primary colors change in N ways on the left side, and the saturation i
Shows the sum of the number of hues 6i and the number of lightness Ni when the value changes from 1 to N-1.

Next, the color picker 2 according to the present invention will be described. The color picker 2 is displayed on the display 3 of the computer. FIG. 3 is a block diagram showing the configuration of the color picker 2 of the present invention. In FIG. 3, reference numeral 2a denotes a color palette, reference numeral 2b denotes color data, reference numeral 2c denotes an adjustment unit, and reference numeral 2d denotes a central processing unit.

When coloring an image created on the display 3 using the color picker 2, the user selects a desired color from a color palette via an input device 4 such as a keyboard or a mouse. Colors the image. Alternatively, when converting or replacing the color of an image that has already been colored, the user operates the RGB luminance information by the adjustment unit 2c via the input device 4 to change the color of the image displayed on the display 3. Change or replace

That is, as shown in the block diagram, the color pallet 2a has color data 2b for holding R, G, and B luminance information corresponding to the color pallet 2a. A program for specifying a color is stored in a storage area (not shown) of the central processing unit 2d. Then, the color is specified based on the position information on the color pallet 2 a specified by the input device 4 or the luminance information by the adjustment unit 2 c and output to the display 3.

The color picker 2 of the present invention can select whether to represent the color pallet 2a by continuous gradation or a color chart composed of a plurality of color charts. When continuous tone is selected, the color palette of the color picker 2 is displayed based on the color space 1. The color palette 2a is shown on the screen as a plane parallel to the center axis of the color space, a plane perpendicular to the center axis of the color space, or a plane spreading in an umbrella shape from the center axis of the color space. In addition to the above display, by displaying a bar for selecting the lightness and enlarging and displaying a predetermined portion of each surface, it is possible to further easily search for a color. Each surface shown as the color pallet 2a is configured so that the color space 1 can be cut along a desired sectional line and displayed.

As described above, as the color palette 2a,
It is configured such that various parts of the color space 1 are displayed. The color pallet 2a can be displayed according to the use or purpose for which the color pallet 2 is used.

FIG. 4 shows a screen of the color picker 2. On this screen, a color palette 2a based on a color chart is displayed by setting the number of colors. On the screen, a plane 2e parallel to the center axis of the color chart, a plane 2f perpendicular to the center axis of the color chart,
Further, a bar 2h for selecting the brightness and an enlarged view 2g in which a main part of the plane 2f is enlarged are displayed. The section line 2i
By changing the position, a cross section obtained by cutting a desired portion of the color chart is displayed.

On the screen, it is possible to select whether to display a plane 2f perpendicular to the center axis of the color space or the color chart or to display an umbrella-shaped surface from the center axis of the color space or the color chart. The display switching button 2j is displayed. When "horizontal" of the display switching button 2j is selected, a plane perpendicular to the central axis of the color space or the color chart is displayed in the color palette 2a, and when "overhead view" is selected, an umbrella-shaped cross section extending from the central axis is displayed. Is shown. When a plane perpendicular to the central axis is shown, colors with substantially the same brightness for each hue can be seen, and when an umbrella-shaped cross section extending from the central axis is shown, colors with low to high brightness for each hue Is displayed, which is suitable for a simulation such as mixing colors. At this time, if a display unit (not shown) for mixing and simulating the colors is provided on the screen, the mixing of the colors can be visually confirmed.

When a color chart is displayed on the color picker 2, the total number of colors displayed on the color chart can be freely set. Changing the total number of colors is performed by adjusting the N value shown at the top of the screen. By specifying the N value, the% setting indicating the rate of change of the three primary colors and the total number of colors are automatically displayed.

An example where N = 11 is shown on the screen of the color picker 2 shown in FIG. In addition, for example, N =
When set to 3, the three primary colors are reproduced in 50% increments.
Seven colors can be shown. Alternatively, when N = 5, 125 colors in which the three primary colors are reproduced at 25% intervals can be shown. As described above, the N value is set according to the situation or purpose of using the color picker 2.

The color chart shown in the color chart includes:
It is also possible to adopt a configuration in which coordinates are given by the mixing ratio of three primary colors of color light or color material. At this time, coordinates based on the RGB mixture ratio are given to each color chart. The RGB mixing ratio of each color chart is RG
When the B ray gun changes in N ways, the stage of the change is represented by a percentage value, and is displayed by a combination of the percentage values. In a general computer, each color is represented by the emission of an RGB electron gun. Therefore, by specifying each color only with the RGB data as described above, it is possible to obtain common color information between different computer systems. Thus, transmission of color information and mutual data conversion between different types of computers become possible.

Further, an adjustment section 2c is displayed below the color pallet 2a. The adjusting unit 2c displays the mixing ratio of the three primary colors of the designated color. The specified color is
It is indicated by a mixing ratio of three primary colors (RGB) of color light and three primary colors of color light (CMY) required for printing processing, plus K (black), or a Lab value. The adjustment unit 2c is configured to freely adjust the selected color, and the user can operate the adjustment unit 2c to obtain a desired color.

[0079]

As described above, the color space and the color chart of the present invention have substantially the same visual lightness of the color represented by each lightness, and include the three attributes of color and the concept of complementary colors. With such a configuration, it is easy to specify and compare colors, and it is possible to smoothly and appropriately perform various color designs and simulations.

Further, by using the color space or the color chart as a color picker, a color space or a color chart in which the visual brightness of the color represented by each brightness is unified can be effectively used in an actual color design or color simulation. Can be used. Also, by giving the coordinates based on the RGB mixture ratio to the color chart of the color chart, it becomes possible to share information between different computer systems.

Further, the color picker of the present invention is configured so as to be able to indicate a desired portion of the color space, and thus can respond to various needs of the user. Since the main part can be enlarged and displayed,
It is easy to capture subtle changes in color and contrast, and can be suitably used for more delicate designs and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a procedure for forming a color space of the present invention from a first color space and a second color space.

FIG. 2 is an explanatory diagram showing a display image of a color picker of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a color picker.

FIG. 4 is a graph showing brightness values obtained by calculation.

FIG. 5 is a graph comparing a brightness value obtained by a calculation formula with a brightness value in the Munsell system;

FIG. 6 is an explanatory diagram for describing a procedure for obtaining a coordinate value of a corresponding point io in the Ostwald color space from coordinates of a point i specified in the color space according to the present invention.

FIG. 7 is an explanatory diagram for describing a procedure for obtaining a coordinate value of a corresponding point io in the Ostwald color space from coordinates of a point i specified in the color space according to the present invention.

FIG. 8 is an explanatory diagram for describing a procedure for obtaining a coordinate value of a corresponding point io in the Ostwald color space from the coordinates of the point i specified in the color space according to the present invention.

FIG. 9 is an explanatory diagram for describing a procedure for obtaining the coordinate value of a corresponding point io in the Ostwald color space from the coordinates of the point i specified in the color space according to the present invention.

FIG. 10 is an explanatory diagram showing how to obtain RGB values of a point io.

FIG. 11 is an explanatory diagram showing a conventional example.

FIG. 12 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 color space 2 color picker 2a color palette 2b color data 2c adjustment unit 2d central processing unit 3 display 4 input device 10 first color space 11,12 vertices 13 hue circle 20 second color space

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor ▲ Taka ▼ Hata Toshio 97, Yagi-cho, Shinjuku-ku, Tokyo (72) Inventor Naoki Tokaibayashi 2-45 Aomi, Koto-ku, Tokyo S.D. O (72) Inventor Yasunori Yamada 3-5-3, Kayabacho, Nihonbashi, Chuo-ku, Tokyo American speedy Japan F-term (reference) 2G020 AA08 DA02 DA03 DA04 DA14 DA16 DA35 5B050 DA04 EA05 EA09 EA18 FA02 FA05 FA09

Claims (5)

[Claims] 1. In a color space for specifying colors expressed on various display media, one vertex is set to the highest brightness, the other vertex is set to the lowest brightness, and a color is shaded from a central axis connecting the two vertices. In a color space in which the degree of shading increases outward, the cross-sectional shape of the vertical plane passing through the central axis is a rhombus, and the color that appears on the cross-section of a plane perpendicular to the central axis is A color space in which the lightness of human vision is substantially the same. 2. A color chart for specifying colors expressed on various display media, wherein one vertex is set to the highest brightness and the other vertex is set to the lowest brightness, and is equally spaced on a center axis connecting the two vertices. An achromatic color chart showing increasing or decreasing lightness, and a color chart represented by a chromatic color chart showing saturation increasing at equal intervals outward from the center axis, passing through the center axis. A color chart, wherein the shape of a cross section of a vertical plane is a rhombus, and the color charts appearing on the cross section of a plane perpendicular to the central axis have substantially the same lightness as seen by a human. 3. A color picker displaying a color space according to claim 1, wherein the color picker includes a color palette and color data corresponding to the color palette, wherein the color palette is a detection target portion. A color picker, wherein one point of the detection target portion is designated, and color data corresponding to the one point is detected from the color data and displayed. 4. A color picker displaying a color chart according to claim 2, wherein the color picker includes a color palette and color data corresponding to the color palette, wherein the color palette is a detection target portion. A color picker, wherein one point of the detection target portion is designated, and color data corresponding to the one point is detected from the color data and displayed. 5. The color palette includes a plane parallel to the center axis of the color space or the color chart displayed on the color picker, a plane perpendicular to the center axis of the color space or the color chart, or the color space or 5. The color chart is represented by at least one of surfaces extending in an umbrella shape from a central axis of the color chart.
Any of the color pickers described.