This standard specifies the classification of colors and the determination of color numbers according to the three attributes of color perception - hue, lightness and chroma. This standard is the basis for the preparation of the Chinese color system standard sample, as the basis for the preservation, transfer, communication and identification of colors. GB/T 15608-1995 Chinese Color System GB/T15608-1995 Standard download decompression password: www.bzxz.net
This standard specifies the classification of colors and the determination of color numbers according to the three attributes of color perception - hue, lightness and chroma. This standard is the basis for the preparation of the Chinese color system standard sample, as the basis for the preservation, transfer, communication and identification of colors.

National Standard of the People's Republic of China
Subject Content and Applicable Scope
Color System
CB/T15608-1995
This standard specifies the classification of colors and the determination of color numbers according to the three attributes of color perception: hue, lightness and chroma. This standard is the basis for the preparation of the Chinese color system standard sample and serves as the basis for the preservation, transmission, communication and identification of colors. 2 Referenced Standards
Methods of expressing color
GB 3577
GB 3978
Standard illuminants and lighting observation conditions
GB5698 Color Terms
3 Terminology
3.1 Color
Neutral color of an object with a lightness greater than 8.5. 3.2 Surface color
The color of the surface of an opaque object.
3.3 Chroma
The visual perceptual characteristic value of the color intensity of the surface of an object, and is divided by the distance from the point of no color of equal brightness. 3.4 Chromatic colour
Color other than achromatic colour.
3.5 Loss
The property of directional selective reflection, which is manifested in the appearance of different degrees of bright spots on the surface or the formation of an image of an object overlapping the surface. 3.6 Glassiness
The glossiness of the surface of an object expressed in numerical values. 3.7 Black
Neutral color with a lightness of less than 2.5.
3.8 Complementary colour Two colors that are mixed in appropriate proportions to produce a neutral color. 3.9 Grey
Neutral color with a lightness of between 2.5 and 8.5. 3.10 Absolute white
Ideal white color with a lightness of 10.
3.11 Absolute black absolute black
Ideal black with a brightness of 0. bzxz.net
Approved by the State Administration of Technical Supervision on June 19, 1995 and implemented on February 1, 1996
3.12 Value
GB/T 15608...1995
The visual perceptual characteristic value indicating the brightness of the color of the surface of an object, with absolute white and absolute black as the reference for sub-grading. 3.13 Tristimulus values
In the trichromatic system, the amount of blue original stimulus required to achieve color matching with the light to be measured. 3.14 Colour appearance (color table) colour appearance The subjective expression of color related to colour stimulus and material texture. 3.15 Hue
One of the three attributes of colour, used to indicate the characteristics of red, yellow, green, blue, purple and other colours. 3.16 Colour card coluur rhip
Indicates the standard sample of a certain color.
3.17 Color chart album olourallas
A color diagram arranged according to a specific color system. 3.18 Color space culourpace
Indicates the three-dimensional space of color.
3.19 Color solid coloursolid
In the space of a specific color system, the space occupied by the surface color. 3.20 Chromaticity diagram chromaticity diagram A plane diagram showing chromaticity coordinates. : Generally rectangular coordinates are used, such as rectangular coordinate chromaticity diagrams. 3.21 Chromaticity coordinates chromalirily coordinates The ratio of each of the three stimulus values ​​to their sum. In the XY2 color system, the three stimulus values ​​X, Y, z can be calculated as the chromaticity coordinates r, 3&. z
+=X+++23=X+Y+2\X+++z
3.22 Color temperature Tcolar 1 cmp crature
When the chromaticity of a light source is the same as the chromaticity of a perfect radiator (black body) at a certain temperature, the temperature of the perfect radiator 3.23 Color gamut coluur gatnut
The color range obtained by mixing a certain amount of primary colors. Or under specific conditions, a certain area in the chromaticity diagram or a certain volume in the color space that includes all luminous colors.
3.24 Visual field
The range of the solid angle formed by the observed object and the eye. 3.25 Achromatic (neutral range) eural colaur The surface of an object without spectral selectivity is negative.
3.26ClF Standard illuminant CIEstantdeirditlunminats A specific relative light harmonic power distribution irradiated on an object specified by CIE, including: Standard illuminant A, a perfect radiator with an absolute temperature of 2856K specified according to the International Practical Temperature Scale; h.
Standard illuminant C: average light with a correlated color temperature of about 6774K; Standard illuminant 13: average light with a correlated color temperature of about 6504K; Standard illuminant [: light with a correlated color temperature of about 5503K; Standard illuminant [2: daylight with a correlated negative temperature of about 7504K. 3.27 Colour rendering index colour rendering index 3.28 Colour numbering GB/T15608—1995 A set of characters used to mark colours in a colour system. 3.29 Colour naming Specifying the name of a colour sample. 3.30 Colour matching Makes a blended colour visually equal to another given colour. 3.31 Colour system Arranges colours in a regular sequence using a standard numbering system in accordance with the visual characteristics of human beings. 3.32 Illuminating-viewing condition The geometric relationship between the lighting source, the object and the observer. 3.33 Intermediate colour The colour produced by mixing adjacent hues in the colour system, usually the yellow-red, green-green, blue-green, purple-purple and red-purple colours. 3.34 Perception
The overall reflection of the human brain on the objective things that directly act on it. In the colour system, it refers to the colour light stimulation acting on the visual system. 3.35 Elementary colour
The primary colours specified in the colour system, the band refers to the red, yellow, green, blue and purple colours on the hue wheel. 4 Colour system
4.1 Composition of colour
Colour is represented by achromatic colours and chromatic colours in a three-dimensional form (see Figure 1). 4.2 Achromatic colours
Achromatic colours are composed of absolute hue and hue, absolute black and black and grey mixed with hue and black in irrational proportions, collectively referred to as neutral colours.
4.2.1 Geometric representation of neutral colors
Neutral colors are one-dimensional and form the central axis of the color solid, i.e. the vertical axis of Figure 1. White
Figure 1 Color solid
4.2.2 Symbol, classification and degree of neutral colors The symbol of neutral colors is denoted by N. The classification of neutral colors is denoted by the degree factor Y as the symbol of each color. N
4.3 Color system
GB/T 156081995
Classification of neutral colors and their relationship with the lightness factor 0.5
The color system consists of the three attributes of color: hue, lightness and chroma. The positions of the color space they occupy in the color solid are shown in Figure [4.3.1 Hue symbol and its attributes
Hue is denoted by the symbol H.
4.3.1.1 The hue circle has five main colors: red (R), yellow (Y), green (G), blue (B), and purple (P). Red is the starting point of the hue circle in a counterclockwise direction (see Figures 1 and 2).
Figure 2 Composition of the hue circle
4.3.1.2 The color between two adjacent primary colors is the intermediate color, namely red-yellow (YR), yellow-green (GY), green-blue (BG), blue-purple (PB), and purple-red (R) (Figure 2). The primary colors and the intermediate colors form 10 basic colors, a 10-point circle. 4.3.1.3 In order to make a finer division of hues, the adjacent colors of the 10 basic colors are divided into 4 equal parts. Therefore, there are a total of hues on the hue circle. The adjacent hues are equidistant visually. 4.3.1.4 The hue is labeled as a numerical value 102.5-57.5-10. The starting point of the previous 10 hues is 0, which is also the starting point of the previous hue.The last 10 is the end of the current hue and the starting point of the next hue (0, see Figure 2), followed by the number of the basic color, such as 10YR. The hue numbered 5 is the pure hue of the color. The symbols of the 40 colors are shown in Figure 2. 4.3.2 Lightness symbol and its attributes
Lightness is represented by the symbol V. Lightness is a color attribute that distinguishes the lightness and darkness of a color, see Figures 1 and 3. Adjacent lightnesses are equidistant visually.
GB/T 15608-1995
Chroma C
247678
Figure 3 Lightness scale and chroma scale
4.3.2.1 This standard divides the central axis of the color solid from 0/ for absolute black to 10/ for absolute white into 11 levels, see the numbers of the lightness scale in Figure 3. The lightness level is labeled as shown in Table 2.
4.3.3 Color symbol and its properties
Lightness level and its relationship with brightness factor 3
Chroma is represented by the symbol C. Chroma is a color attribute that distinguishes the degree of color intensity (depth and depth). Adjacent chromas are visually equidistant.
Chroma takes the central axis of the color body as the starting point 0. As the hue circle expands, the chroma also increases. It is labeled with every 2 steps, as shown in the chroma scale of Figure 3: 2, 4, 6, 8 to the maximum chroma limit of the hue. 4.4 Color labeling
Any color can be represented by the hue, lightness and chroma on the color solid. Calibrate and give a certain number. The calibration method is to write the hue H first, then the lightness V, and write the chroma after the slash. CHV/C = hue lightness/chroma
4.4.1 Labeling method for achromatic system
The labeling method for neutral color is: Nz
For example. N5
4.4.2 Labeling method for chromatic system
The labeling method for chromatic system is: HV/C
For example: 2.5R 5/10
4.4.3 Chromaticity coordinates of color codes
For chromaticity coordinates of color codes, see Appendix A: 4.4.4 Use of color codes
In engineering design and product labels with color as the main feature, the color codes corresponding to the color codes in this standard should be marked: Colors different from the codes can be calibrated by interpolation.
4.4.5 In order to distinguish from other color systems, the color coordinates of the color codes can be marked in the standard when necessary. Add \GB\ before the number. 4.5 Color difference tolerance of samples in the Chinese color system
Achromatic samples 0.5≤4E≤1.5
Color samples 1.5≤AE≤3.0
Some color samples E can be appropriately relaxed. H
15608—1995
Appendix A
Standard values ​​of chromaticity coordinates of color samples in the Chinese color system (supplement)
( 316 8
0. 3:31 3
.338 0
.341 9
c,332
. 3a1
0. 35.8 2
0,3120
9,348 5
. 321 0||t t | 6
0, 465 5
0-3235
GB/T15608—1995
y --61. 20
01. 288 9
0. 3-15 1
0- 372 0
15608-1995|| tt | 283 0
15608—1995
0. 2418 9
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