Some standard content:
ICS.17.180.20
National Standard of the People's Republic of China
GB/T5698—2001
Color Terms
Glossary of color terms
Published on 2001-06-12
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
Implemented on 2001-12-01
GB/T 5698-2001
Cited Standards
Light Measurement Terms
Color Measurement Terms
Visual Terms
Other Terms
Appendix A (Appendix to the Standard)
Appendix B (Appendix to the Standard)
Chinese Index
English Index
GB/T5698-2001
This standard has revised the terms in the original standard GB/T5698-1985 "Color Terms", canceled the outdated or uncommon content in the original terms, and added 17 terms in color measurement and vision, 18 main color terms used in GB/T15608-1995 "Chinese Color System", and supplemented 9 new color measurement and visual terms that must be introduced according to the current scientific and technological development and the expansion of color measurement technology and application. In addition, 2 terms in color measurement are moved to visual terms. Through these adjustments, the content covered by color terms is more extensive and rich. After deleting those unimportant and unnecessary terms, its content is more in line with the times and scientific. This standard has comprehensively sorted out and revised the unclear or wrong explanations, drowned words and typos in the original standard, making the sentences more fluent and clear.
This standard includes 21 light measurement terms, 93 color measurement terms, 66 visual terms, and 5 other terms, a total of 185 terms. There are also Chinese and English indexes to make it easy for readers to query relevant terms. From the date of implementation, this standard will replace GB/T5698-1985 at the same time. This standard is proposed and managed by the National Technical Committee for Color Standardization. This standard is drafted by the China National Institute of Metrology. The main drafters of this standard are: Park Dazhi, Hu Weisheng, Teng Xiujin, Ma Yu, Li Heng, Li Yazhang, and Xiao Hui. 1 Scope
National Standard of the People's Republic of China
Color Terms
Glossary of color terms
This standard specifies the terms of light measurement, color measurement, visual terms and other aspects. This standard applies to colorimetry, photometry and fields related to color standardization. 2 Referenced Standards
GB/T5698—2001
Replaces GB5698—1985
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T15608—1995 China Color System
3 Light Measurement Disk Terms
3.1 Light
Electromagnetic radiation that can produce brightness and color perception in the human visual system, also called visible electromagnetic radiation. Its wavelength range is generally 380nm~780nm
3.2 Spectral concentration spectral concentration The ratio of the radiation amount X (i.e. radiant flux, irradiance, radiant brightness, etc.) within a small wavelength width range centered on wavelength λ to the wavelength width.
Note: For a specific radiation amount, such as radiant flux, the spectral concentration can be referred to as spectral radiant flux, and the symbol is @(λ)a)
The unit is .W·m- or Wnm\!
3.3 Spectral power distribution spectralpowerdistribution The numerical relationship between spectral concentration and wavelength. Note: In order to clarify the nature of the spectral flux, the optical harmonic power distribution of the spectral flux is called spectral radiant flux power distribution. It is represented by the symbol (). The subscript λ represents the coefficient of wavelength, and (a) represents the function of wavelength. 3.4 Relative spectral power distribution relativespectralpowerdistribution The relative value of spectral power distribution.
3.5 Spectral sensitivity spectral sensitivity The ratio of the receiver response value to the spectral radiant flux or irradiance under unit wavelength width irradiation. 3.6 Spectral luminous efficiency spectral luminous efficiency The efficiency of the human eye in producing light perception for light energy of different wavelengths with the bee value normalized to 1. That is, under the specified observation conditions, when the monochromatic radiation of wavelength in reaches the brightness match with the reference radiation, the relative value of the reciprocal of the radiance of the monochromatic radiation of wavelength in. The maximum value of its relative value is set to 1. Its spectral luminous efficiency function is represented by V(in). 3.7 Spectral luminous efficiency curve spectral luminous efficiency curve The relationship between the spectral luminous efficiency and wavelength at each wavelength is taken as 1. 3.8 Mesopic spectral luminous efficiency When the adaptation brightness of the eye is between the range of bright vision and dark vision, the spectral luminous efficiency of the visual system is simultaneously affected by the cones and rods of the visual system. The spectral luminous efficiency function of mesopic vision is represented by V(>). 3.9 Scotopic spectral luminous efficiency When the adaptation brightness of the eye is lower than 10-3cd/m2, the spectral luminous efficiency of the visual system is mainly affected by the rods of the visual system. The spectral luminous efficiency function of dark vision is represented by V(a). 3.10 Luminous reflectance Luminous reflectance is the ratio of the luminous flux reflected by an object to the luminous flux incident on the object. Luminous reflectance is represented by P. p
3.11 Luminous transmittance Luminous transmittance is the ratio of the luminous flux transmitted from an object to the luminous flux incident on the object. Luminous transmittance is represented by. Q
3.12 Luminance factor luminancefactor
Under specified lighting and observation conditions, the ratio of the luminance L of a point on the surface of a non-self-luminous body in a given direction to the luminance L of a completely reflecting or completely transmitting diffuse body under the same conditions. The radiance factor is expressed as β. e.
3.13 Radiance factor radiancefactor Under specific lighting and observation conditions, the ratio of the radiance Le of an object to the radiance Le of a completely diffuse reflecting surface or a completely non-transmitting surface. The radiance factor is expressed as β.
3.14 Reflectance factor reflectancefactor Under specified lighting conditions, within a specified solid angle, the ratio of the radiant flux or luminous flux Φ reflected from an object to the radiant flux or luminous flux Φ reflected from a completely non-reflecting surface. The reflection factor is expressed as R. or R. R. (or R) =
Note: When the solid angle is close to 2 steradian degrees, its reflection factor is close to the light reflectance ratio. When the solid angle is close to 0, its reflection factor is close to the brightness factor or radiance factor.
spectralreflectance
3.15 Spectral reflectance
The ratio of the radiant flux or luminous flux @ of wavelength input reflected from the surface of an object to the radiant flux or luminous flux Φ of the wavelength incident on the surface of the object. Spectral reflectance is expressed as p (>). pa) =
GB/T5698—2001
3.16 Spectral transmittance The ratio of the radiant flux or luminous flux of wavelength input transmitted by an object to the radiant flux or luminous flux of wavelength input incident on the surface of the object. Spectral transmittance is expressed as (>).
t(a) =
3.17 Spectral reflectance factor spectral reflectance factor Under specified lighting conditions and within a specified solid angle, the ratio of the radiant flux or luminous flux @ of wavelength λ reflected from an object to the radiant flux or luminous flux Φn of wavelength λ reflected from a completely diffuse reflecting surface. The spectral reflectance factor is expressed as R(λ). R(a)
3.18 Spectral radiance factor
spectralradiancefactor
Under specified lighting and observation conditions, the ratio of the spectral radiance L of an object at wavelength l to the spectral radiance Lm of a perfectly non-reflective surface or a perfectly diffusely transmitting surface at wavelength l. The spectral radiance factor is expressed as β(a). B(A)
3.19 Perfectly diffuse reflecting surface perfectreflectingdiffuserLex
The radiation incident on an object has the same radiance in all directions and an ideal surface with a spectral reflectance of 1. 3.20
Perfectly diffuse transmitting surface perfecttransmittingdiffuserThe radiation incident on an object has the same radiance in all directions and an ideal surface with a spectral transmittance of 1. 3.21
Brightness
At a certain point on the emitting surface, the illuminated surface or the light propagation section, the quotient obtained by dividing the luminous flux of the tiny face element in a certain direction in the tiny solid surface by the product of the orthographic projection area of the tiny face element and the tiny solid angle, the brightness is expressed in I or L. The unit is cd/m*
where: dA is the area of the tiny face element, m;
do is the tiny solid angle, Sr
dA·dn.coso
0 is the angle between the normal of the tiny face element and the given direction, (\). Note: For a point on the emitting surface, when the light intensity in a given direction is 1, dl
For a point on the receiving surface, when the illuminance at that point is E, dE.
dn·coso
4 Color measurement terms
4.1 Color
Visual characteristics other than spatial properties caused by light acting on the human eye. Visual characteristics expressed by color names or three attributes of color. 4.2 Neutral color
Surface color of an object without spectral selectivity. [3.24 in GB/T15608-1995] 4.3 White
GB/T5698-2001
Neutral color of an object with a brightness greater than 8.5. [3.1 in GB/T15608-1995] 4.4 Black
Neutral color of an object with a brightness less than 2.5. [3.6 in GB/T15608-1995] 4.5 Absolute white absolutewhite
Ideal white with a brightness of 10. [3.9 in GB/T15608-1995] 4.6 Absolute black absoluteblack
Ideal black with a brightness of 0. [3.10 in GB/T15608--1995] 4.7 Gray gray
Neutral color with a brightness between 2.5 and 8.5. [3.8 in GB/T15608-1995] 4.8 Complementary color complementarycolor
Two colors that can be mixed in appropriate proportions to produce a neutral color. Two colors that can be matched to a specified achromatic stimulus by additive mixing. [3.7 in GB/T15608-1995] Intermediate color intermediatecolor
The color produced by mixing two adjacent colors, usually refers to the five colors of yellow-red, green-yellow, blue-green, purple-blue, and red-purple on the color wheel. [3.32 in GB/T15608-1995]
4.70 Primary color elementarycolor
The main color specified in the color system, usually refers to the five colors of red, yellow, green, blue, and purple on the color wheel. [3.34 in GB/T15608-1995]
4.11 Light source color lightsourcecolor
The color of light emitted by a light source.
Object color objectcolor
The color of light reflected or transmitted by an object. 4.13
Surface color surfacecolor
The color of the surface of a diffusely reflecting, opaque object. 4.14 aperture color aperture color
The color observed through the aperture without a sense of depth. For example, the color observed from a small hole on a screen. 4.15 primary color primary color
The specific color used in color matching experiments. For example, red, green, and blue. Three primary colors are generally used, and any of the three primary colors cannot be added and mixed by the other two primary colors. 4.16 food
color stimulus color stimulus
Visible light radiation that can cause colored and non-colored sensations when entering the human eye. Color stimulus function color stimulus function 4.17
Color stimulus is expressed as a wavelength function of spectral density. It is expressed as Φ (>). B color stimulus value psychophysical color specification 4.18
The quantity of color stimulus properties expressed by three stimulus values. 4.19 isochromatic stimulus is a color stimulus that acts on adjacent visual fields at the same time and causes the same perception. Note
When the spectral power distribution is the same, it will definitely cause the same color perception. When the spectral power distribution is different, it may sometimes cause the same color perception. 1
2In photometry, if the light has the same chromaticity, it is usually said that they are isochromatic. 4.20 Heterochromatic stimuliColor stimuli that act on adjacent fields of view at the same time and cause different color perceptions. 4
GB/T5698—2001
4.21 MetamericcolorstimuliTwo color stimuli with different spectral compositions but the same color perception under specified observation conditions. Note: The specified observation conditions refer to the observer and the size of the field of view. For the color of the object, it refers to the harmonic power distribution of the illumination light, etc. 4.22 ReferencecolorstimuliIn the trichromatic system, a specific color stimulus that serves as the basis for color addition. Note: In the XYZ color system, [X].[Y].[Z] stimuli are used, and in the XY1Z color system, [X].[Y].[Z] stimuli are used. ], [Y.], [Z] stimuli. 4.23 tristimulus values tristimulus values the amounts of three reference color stimuli required to achieve color matching with the color stimulus to be measured in a trichromatic system. Note: In the XYZ color system, the tristimulus values [X, [Y]. [Z] are used. In the XYZ color system, the tristimulus values [X.]. [Y]. [Z] are used.
matching stimulus matchingstimuli
In a hue-additive visual colorimeter, the original stimulus specified by physical methods. 4.25 basic stimulus basicstimuli
Specific white stimulus, which is used as a reference to determine the relative size of the reference color stimulus in the trichromatic system. monochromatic stimulus 4.26
Color stimulus of monochromatic light.
spectral tristimulus values spectral tristimulus values in a trichromatic system, the tristimulus values of equal-energy monochromatic radiation. Note: In the XYZ color system of CIE, it is represented by (),), and in the XYZ color system of CIE, it is represented by ), (), z().
Achromatic stimulus4.28
Color stimulus perceived as achromatic under normal observation conditions. Color specification
Quantitatively represents color with psychological characteristics or psychophysical characteristics. For example: hue, lightness and chroma represent color with psychological characteristics; tristimulus values represent color with psychophysical characteristics. 4.30
Colorimetric systemcolorimetric system
A system that represents color according to specified definitions and symbols, also known as a colorimetric system. 4.31 Trichromatic systemA colorimetric system that represents the color stimulus to be measured by appropriately selecting three reference color stimuli and achieving color matching with the color stimulus to be measured after additive mixing.
4.32 Trichromatic specificationColor is represented by three reference color stimuli. 4.33 Monochromatic specification Color is expressed by the dominant wavelength, complementary wavelength, purity and Y among the three stimulus values. 4.34XYZ colorimetric systemXYZ colorimetricsystem A three-color system based on the spectral tristimulus values (>), (>)z (a) specified by CIE in 1931. 4.35XioYuZ colorimetric systemXioYZocolorimetricsystem A three-color system based on the spectral tristimulus values 1o (>), y1 (2), 21 (>) specified by CIE in 1964. 4.36CIE 1931 standard colorimetric observerCIE 1931standardcolorimetricobserver A hypothetical observer whose colorimetric characteristics are consistent with the color matching functions (a), (A), (>) in the XYZ colorimetric system.
4.37 CIE1964 supplementary standard colorimetric observer CIE1964 supplementary standard colorimetric observer is a hypothetical observer whose chromaticity characteristics are consistent with the color matching functions 1 (λ), 5
y1o(), z1o(a) in the X1aY1Z1 colorimetric system.
4.38 Chromaticity
GB/T5698—2001
The psychophysical properties of color stimuli expressed by the combination of the main wavelength (or complementary wavelength) and purity on the chromaticity coordinates. 4.39 Chromaticity (degree) coordinates chromaticity coordinates The ratio of each tristimulus value to their sum. In the XYZ colorimetric system, the chromaticity coordinates ry, 2 can be calculated from the tristimulus values X, Y, Z. For the X.Y1Z1 colorimetric system, the chromaticity coordinates are oy10, z10. Xe
110=X1+Y10+20
X+y+2'
Jo = Xi + Y1 + Z1o
X+y+2,
4.40 Chromaticity diagramchromaticitydiagram A plane diagram showing the chromaticity coordinates of a color.
4.41 UCS diagramuniform-chromaticityscalediagram2.0
Xi+YI+Zyo
A uniform-chromaticity scale diagram obtained by transforming the CIE chromaticity diagram in some way. On the equal-brightness UCS diagram, the color difference between two points is proportional to the distance between them.
4.42 CIE1960UCS diagramCIE1960UCSdiagramThe UCS diagram specified by CIE in 1960. The u and u coordinates can be obtained from the three stimulus values X, Y, Z or chromaticity coordinates z, y in the XYZ colorimetry system.
X+15Y+3Z
U=×+15Y+3Z
4.43CIE1976UCS diagramCIE1976UCSdiagram4r
=2+12y+3
=2+12y+3
UCS diagram specified by CIE in 1976. The u and u coordinates can be obtained from the three stimulus values XY, Z or chromaticity coordinates z, y in the XYZ colorimetry system.
X+15Y+3Z
X+15Y+3Z=
-2x+12y+3
-2x+12y+3
4.44 Spectral chromaticity coordinates spectral chromaticity coordinates of monochromatic light stimulus. Indicated by (a), y(), z(a). 4.45 Spectral locus spectrum locus
On the chromaticity diagram, the locus formed by connecting the points of the chromaticity coordinates of monochromatic light stimuli of various wavelengths. 4.46 Purple-red boundary purpleboundary
On the chromaticity diagram, the straight line connecting the purple and red ends of the visible spectrum locus. 4.47
dominant wavelength dominantwavelength
When the specified achromatic stimulus and a monochromatic light stimulus are added and mixed in an appropriate proportion, a color match is achieved with the test color stimulus, then the monochromatic wavelength is the dominant wavelength, and the dominant wavelength is indicated by λ. 6
GB/T5698-2001
4.48 Complementary wavelength complementarywavelength When the test color stimulus and a monochromatic light stimulus are added and mixed in an appropriate proportion, the color match with the specified achromatic stimulus is achieved, and the monochromatic light wavelength is the complementary wavelength. The complementary wavelength is represented by A. 4.49 Excitation purity On the CIEy chromaticity diagram, the ratio of the distance from the achromatic point to the sample chromaticity point to the distance from the achromatic point to the sample dominant wavelength point. When using complementary wavelengths, the excitation purity is the ratio of the distance from the achromatic point to the sample point to the distance from the achromatic point through the sample point to the intersection point on the purple-red track. The excitation purity is represented by P. P.
or P—
where: ..y.--chromaticity coordinates of specific achromatic point; T, y-chromaticity coordinates of test color stimulus; wwW.bzxz.Net
d, y are equivalent to the coordinates of the point on the spectrum locus of the main wavelength, or the chromaticity coordinates of the point on the purple-red locus of the complementary wavelength.
4.50 Chromaticity purity colorimetricpurity The ratio of the brightness of the monochromatic light stimulus to the brightness of the test color stimulus after adding and mixing the specified achromatic stimulus and the menu color light stimulus in an appropriate proportion to achieve color matching with the test color stimulus. Chromaticity purity is expressed as P. La
where: Lg--Brightness of monochromatic light stimulus or color stimulus on the purple-red locus, unit: cd/mL--Brightness of specific achromatic stimulus, unit, cd/m\; L--Brightness of test color stimulus, unit: cd/m. Note: In the XYZ colorimetric system, chromaticity purity P. There is the following relationship between the excitation purity P. and P.: P.Peya
where: ya——chromaticity coordinates of monochromatic light stimulus or color stimulus on the purple-red locus; chromaticity coordinates of test color stimulus,
In the XioYioZlo colorimetric system, chromatic purity Peto-Paoyaro
4.51 Spectrophotometric colorimetry Spectrophotometric colorimetry is a method of obtaining tristimulus values and chromaticity coordinates by measuring the relative spectral power distribution of the measured light or the spectral reflectance or spectral transmittance of the object.
Spectrophotometric colorimetry is also called spectrophotometric colorimetry. 4.52 Additive mixture of color stimuli The phenomenon that another color is felt when two or more color stimuli are incident at the same part of the retina at the same time or at high frequency alternately, or when color stimuli are mixed in a mosaic manner that the human eye cannot distinguish. 4.53 Additive primaries Additive primaries use basic color stimuli. The three colors red, green and blue are usually used. 4.54 Subtractive mixture Light is combined through color filters or other light absorbing media to produce a different color from the original. 4.55 Subtractive primaries The colors of the basic absorbing media used in subtractive mixing. Usually cyan (absorbing the red part of the spectrum), magenta (absorbing the green part of the spectrum), and yellow (absorbing the blue-violet part of the spectrum) are used. 7
4.56 Color equation colorequation
GB/T5698-2001
The algebraic or geometric representation of the matching of two color stimuli. In this case, the color stimulus is represented by a variable symbol, and the equivalent relationship that achieves color matching is represented by the symbol "blue". For example:
Color spacecolorspace
represents the three-dimensional space of the amount of color.
Color gamutcolorgamut
C(C) =R(R)+G(G)+B(B)
The range of the set of colors that can meet certain conditions in the chromaticity diagram or color space. Color order systemcolorordersystem
A system composed of colors arranged in order in the color space according to the characteristics of perceived color appearance. Color solidcolorsolid
The space occupied by the surface color in the color space of a specific color representation system. Uniform color spaceuniformcolorspace
A color space that can represent the same perceived color difference at the same distance. Color differencecolordifference
Quantitatively expressed color perception difference. Expressed by AE. Color difference formulacolordifferenceformula463
The formula for calculating the difference between two color stimuli. 4.64 (CIE1976)Lab color space (CIELAB color space) (CIE1976) colorSpace (CIELAB colorspace) is a uniform color space recommended by CIE in 1976. This space is a three-dimensional rectangular coordinate system.
L:=116
>0.008856
a =500[()\-()\]
[()\-()\]
6*=200
Where La.6-
Coordinate value of the three-dimensional rectangular coordinate system;
>0.008 856
2>0.008 856
X, Y, z—-XYz color system or XioY1oZu color system three stimulus values: Xn, Y., Z.—Three stimulus values of the completely reflecting surface. Note: The * in this standard is not a comment mark. 4.65 (CIE1976) Lu color space (CIELUV color space) (CIE1976) Luv color Space (CIELUV color space)
Uniform color space recommended by CIE in 1976, a three-dimensional rectangular coordinate system. .=116
u-13L(u-.)
V*=13L'(UV.)
Where:
Tristimulus value Y or Y16
-CIE1976 uniform color space chromaticity coordinates; tristimulus values without a reflective surface.
5（CIE1976）L·αb*color difference formula（CIELAB color difference formula）4.66
>0.008856
(CIE1976）La*b*colordifference4.67
GB/T5698—2001
formula (CIE LAB color difference formula)In the L\a'b colorimetric system, the color difference between two color stimuli is expressed by the difference △L between the coordinates\,a',b\,Aa\A\. The symbol is AE%.
AE=[(AL\)+(Aa')+(A\2
（CIE1976）Lu color difference formula (CIELUV color difference formula) （CIE1976）Lucolordifferenceformula(CIELUVcolordifferenceformula)In the Lu\ colorimetric system, the difference between the coordinates L\,u\, AL',Au',A is used to represent the color difference between two color stimuli. The symbol is △E.||t t||AE\=[(AL\)+(Au')\+(AU\)7/24.68 Hunter's color difference formula Hunter's color difference formula The color difference formula of the uniform color space proposed by Hunter in 1948. Under the illumination of standard light source C, the color difference formula of the surface color is AE=[(AL)°+(Aa)\+(A6)\i/2
L=10y1/2
am17.5(1.02X--Y)
b =7.0(Y- 0. 8472)
Wherein:
AEH Hunter color difference;
AL,Aa,Ab-
Difference of coordinates L, a, b;
X,Y,Z--Tristimulus value of color stimulus in XYz color system. 4.69 Psychrometric lightness In the uniform color space, it is equivalent to the coordinate of lightness. L in Lab color space and Lu color space is defined as CIE1976 psychological lightness.
4.70 Psychrometric chroma coordinate coordinatesIn uniform color space, two coordinates within the equal lightness plane. For example, the two coordinates a' and b\ in Lab color space. 4.711
Color tolerancecolortolerance
The permissible range of color difference between the test color and the specified color. 4.72
Color matchingcolormatching
Making the mixed color visually equal or identical to the given color. 4.73
Maxwell discMaxwell disc
A device for performing color addition tests by arranging sectors of various colors on a circular plate and rotating it rapidly. Color reproductioncolorreproduction
The reproduction of the color of an object on a color picture, color photograph, color television, etc. 4.75
Color appearancecolorappearance
The subjective expression of color related to color stimulus and material texture, etc. Color renderingcolor rendering properties4.76
The property of a light source in showing the color of an object compared to a reference standard light source. Color rendering indexcolorrenderingindex
The measure of the color rendering of a light source.
It is expressed by the degree of correspondence between the color of an object under the measured light source and the color of an object under the reference light source. special color rendering index4.78Special color rendering index8472)
Where:
AEH Hunter color difference;
AL,Aa,Ab-
Difference between coordinates L, a, b;
X,Y,Z--the three stimulus values of color stimulation in the XYz color system. 4.69 Psychrometric lightness In uniform color space, it is equivalent to the coordinate of lightness. L in Lab color space and Lu color space is defined as CIE1976 psychological lightness.
4.70 Psychrometric chroma coordinates In uniform color space, it represents two coordinates within the equal lightness plane. For example, the two coordinates a' and b\ in Lab color space. 4.711
Color tolerance colortolerance
The allowable range of color difference between the test color and the specified color. 4.72
color matchingcolormatching
Making the mixed color visually equal or identical to the given color. 4.73
Maxwell disc
A device for performing color addition tests by arranging sectors of different colors on a circular plate and rotating it rapidly. Color reproductioncolorreproduction
The reproduction of the color of an object in a color picture, color photograph, color television, etc. 4.75
Color appearancecolorappearance
The subjective expression of color related to color stimulus and material texture. Color rendering propertiescolor rendering properties4.76
The property of a light source in showing the color of an object compared with a reference standard light source. Color rendering indexcolorrenderingindex
The measure of the color rendering of a light source.
It is expressed by the degree of correspondence between the color of an object under the measured light source and the color of an object under the reference light source. Special color rendering index4.78 Special color rendering index8472)
Where:
AEH Hunter color difference;
AL,Aa,Ab-
Difference between coordinates L, a, b;
X,Y,Z--the three stimulus values of color stimulation in the XYz color system. 4.69 Psychrometric lightness In uniform color space, it is equivalent to the coordinate of lightness. L in Lab color space and Lu color space is defined as CIE1976 psychological lightness.
4.70 Psychrometric chroma coordinates In uniform color space, it represents two coordinates within the equal lightness plane. For example, the two coordinates a' and b\ in Lab color space. 4.711
Color tolerance colortolerance
The allowable range of color difference between the test color and the specified color. 4.72
color matchingcolormatching
Making the mixed color visually equal or identical to the given color. 4.73
Maxwell disc
A device for performing color addition tests by arranging sectors of different colors on a circular plate and rotating it rapidly. Color reproductioncolorreproduction
The reproduction of the color of an object in a color picture, color photograph, color television, etc. 4.75
Color appearancecolorappearance
The subjective expression of color related to color stimulus and material texture. Color rendering propertiescolor rendering properties4.76
The property of a light source in showing the color of an object compared with a reference standard light source. Color rendering indexcolorrenderingindex
The measure of the color rendering of a light source.
It is expressed by the degree of correspondence between the color of an object under the measured light source and the color of an object under the reference light source. Special color rendering index4.78 Special color rendering index
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