Some standard content:
GH/T 3977—1997
This standard adopts XYZ standard colorimetry system and XY12u supplementary standard colorimetry system to express colors. It is revised on GB 3977—83 according to the relevant provisions of CIE No.15.2 (1986) Colorimetry, the publication of the International Commission on Illumination. In terms of technical content, it is consistent with the method of expressing colors in CIE colorimetry: when this standard was revised according to GB/T1.1—1993 "Guidelines for Standardization", relevant reference marks were added in the compilation of the standard; in the method of expressing colors, the hall method using tristimulus values was added, and in the chromaticity diagram, the black body locus and the chromaticity points of standard illuminants A, C, D and equienergetic light E were added.
This standard is a basic colorimetry standard and should be used in conjunction with GB/T3978—1994 and GB/T3979—1997. This standard shall replace GR3977-83 from the date of entry into force. This standard is proposed and managed by the National Technical Committee for Color Standardization: The National Institute of Metrology is responsible for drafting this standard. The main drafters of this standard are Teng Xiujin, Zeng Xiaodong, Hu Weiye and Xiao Hui. 1 Scope
National Standard of the People's Republic of China
Methods of colour specification
Methods of colour specification GB/T 39771997
Replaces GB3977-83
This standard specifies the method of colour specification for colour matching or physical measurement. In the case of 1° to 4° field of view, the XYZ colourimetric system (CIE1931 standard colourimetric system) is used for representation: in the case of a field of view greater than 4°, the X1YtZ colourimetric system (CIE1964 supplementary standard colourimetric system) is used for representation.
This standard applies to all object colours (including reflected and transmitted colours) and light source colours. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T3978-94 Standard illuminant and lighting observation conditions GB/T3979-1997 Methods for measuring object color GB5698-85 Color terms
3 Definitions
The color terms used in this standard are in accordance with the provisions of (GB 5698). 4 Color display method
XYZ colorimetry system, using x, and stimulus values Y in the three color coordinates, can also be expressed by the three stimulus values X, Y.7. X1Ynz. colorimetry system, using r1, 31 in the one color coordinates and stimulus values Y1 can also be expressed by the three stimulus values XuY.Z.
5 Standard chromaticity observer chromaticity function
The standard chromaticity observer chromaticity function of the XY7 colorimetry system shall be expressed by (A), (a), 2()), and it is stipulated that the (A) value is the same as the spectral luminous efficiency V(>). The values are specified in Table 1 X, Y1.Z. The standard colorimetric observer color function of the colorimetric system is expressed as X(a), Y(4) and Z(1). The values are specified in Table 2.
6 Tristimulus values
6.1 Tristimulus values of light source color
XYZ colorimetric system The tristimulus values X, YZ of light source color are calculated according to formula (1): Approved by the State Administration of Technical Supervision on May 4, 1997
Implementation on October 1, 1997
GB/T 3977—1997
s(a)(a)da
Z = KS(A)z(A)dA
XYZic colorimetric system The tristimulus values Xu, Y, Z of light source color are calculated according to formula (2) Xu Ke
(1).(2)Wu f1: $(a)
(1).(A),2(A)
()()、(A)
S()()d
S(a)yu()da
S()(A)dA
Relative harmonic power distribution of light source!
Wavelength varies with, nm. Generally 10nm or 5nm is used; Chromaticity function in XYZ colorimetry system (Table 1) XYZ. The chromaticity function in the colorimetric system (Table 2) + (1)
is the normalization coefficient specified when the stimulus value Y is regarded as the measured light quantity, and S(>) is the absolute spectral interpolation density. K=683m·W- can be used to calculate the absolute value of the measured light quantity, Kin
a normalization coefficient,
6.2 Three stimulus values of object color
6.2.1 Stimulation value of reflected object color
XYZ The stimulus values X, Y, and Z of reflected object color in the colorimetric system are calculated according to formula (3), X=
R()S(A)r()dA
R()S(A)()A
R(A)S(A)E(A)dA
XY1Z A stimulus value X.YZi of reflected object color in the colorimetric system. According to formula (4), Xu
Yi = K
R(A)S(A)x.(A)dA
R(d)S(A)yu(A)d
R(A)S()z(A)dA
(3), (4) where: R(A)
(3)
spectral reflectance factor, including spectral reflectance and spectral radiance factor, measured according to the provisions of 6.2 of GJ3/T3979;
GB/T 3977—1997
naturalization coefficient, K=100
K,—naturalization coefficient, K= 100,
S(A)S(A)A :
S(A)3s()dA
The relative spectral power distribution of the standard lighting body shall be taken as specified in Chapter 3 of GB/T3978. 6.2.2 The three stimulus values X, Y, Z of the color of a transmitted object in the colorimetric system are calculated according to formula (5): X
T()S(A)t(A)da
r()S(y()dA +
T(A)S(A)2(A)dA
XY1.Z1. The three stimulus values X10.Y1.Z of the colorimetric system are calculated according to formula (6): XK
T(A)SA).(A)dA
Ze = K(A)S(A)zm(A)dA
(5),(6) Where: r()-
Spectral transmittance. Measured according to the provisions of 6.3 of GB/T 3979; K is the normalization coefficient, K = 100
K——Normalization coefficient, =100
7 Calculation method of three-color coordinates
S(a)y(A)da #
S(a) Vm()dx
7.1The three-color coordinates r, y,2 of the XYZ colorimetry system are calculated according to formula (7): X
y\X+Y+z
Where: XYZ
XYZ colorimetry system a stimulus value
7.2XiYnzi, the three-color coordinates yn2 of the colorimetry system are calculated according to formula (8): Xm
= Xo - Ye + 2
X + Y. - z..
20= x+- z. =1
In: X..,Y..Zu
8 Chromaticity diagram
GB/T 3977.-1997
X is the excitation value in the colorimetric system.
Figure 1 Chromaticity diagram of CIE1931 standard colorimetric system 620
The chromaticity diagram of CIE1931 standard colorimetric system (Figure 1) should use the three color coordinates and as the horizontal axis and vertical axis respectively. The curve with wavelength division in the figure is the spectrum track formed by connecting the chromaticity points of various monochromatic lights. The straight line connecting the two ends of the spectrum track is the purple track. The color scale of the spectrum color is specified by Table 1.
The curved line in the center of the chromaticity diagram is the black body track, which indicates the chromaticity point of black body radiation at various temperatures. In the figure, A, C, D. are the chromaticity points of the colorimetric standard illuminants A, C, TD)e respectively. E is the chromaticity point of equal energy white light. The chromaticity diagram of the CIF1964 supplementary standard colorimetric system (Figure 2) should use a color coordinate X: and Y as the horizontal and vertical coordinates respectively. The curve with wavelength division in the figure is the spectrum track, and the straight line connecting the two ends of the spectrum track is the purple track. The three color coordinates of the light harmonic color are specified in Table 2. In the figure, A and CD are the colorimetric standard illumination bodies A and C respectively.D is the chromaticity point, and E is the chromaticity point of equal-energy white light 2
GB/T 39771997
Figure 2 Chromaticity diagram of CIE1964 supplementary standard chromaticity system 1620
Table 1 Chromaticity function and tristimulus coordinates of XYz chromaticity system (A-380 nm~780 nm.AA=5 nm) Chromaticity function
0: 000 4
Tristimulus coordinates
0, 017 7
O195 4
1, 056 7
Color function
0,3810
GB/T3977.--1997
Table 1 (continued)
0. 114. 0
0, 091 3
0, 502 9
Three color coordinates
D, 029 7
0, 039 9
0, 341 3
. 285 9
0, 002 4
0, 000 2
0, 0001
Sum at 5 nm intervals:
() 21. 371 4
23(A) = 27. 371 1
2(A) 21. 371 5
Chromaticity function
.032 0
. 001 0
0,000 73-4 7
0. 73-1 7
0. 73-4 7
Three color scale
0,266 3
,265 3
Sum at 10 nm intervals;
Er(A) - 10. 683 6
2()=10.685 6
2-(4)=10. 677 0
0, 000 0
0, 900
Table 2 Chromaticity functions and color coordinates of XYZ colorimetry system (A-380nm-780nm.^-5nm) Color spot function
10, 00 7
.007 2
0,000 3
0,180 3
Other coordinates
yin(a)
, 019 1
0,019 1
0, 005 1
1,014 2
Chromaticity number
0,185 2
GB/T3977—1997
Table 2 (continued)
, 1771
0,0073
(, 414 2
0, 565 4
Three other coordinates
0,109 0
0, 817 0||tt ||0, 618 2
01. 627 3
1. 1.31 3
0, 014 6
0, 003 1
Chromaticity function
. 461 8
U, 032 6
0, 005 4
t,0018
6, 000 1
GB/T 39771997
Table 2 (continued)
eracas
0, 000 0
c, 000 0
0, 000 0
we,661 2
ts. 719 2
Blue coordinates
0, 317 3
0- 281 4
0, 000 0
Sum at 5 nm intervals:
Zc (A) = 23. 329 4
25..(A) -28. 332 4
22.(A)-23. 834 3
Chroma exposure number
GB/T 3977
Table 2 (end)
xic(a)
Cloud color coordinates
Sum at 10 nm intervals:
Zrm(A) =11. 664 6
2y.(3) -11. 664 4
Zzr(A)-11. 664 5317 3
0- 281 4
0, 000 0
Sum at 5 nm intervals:
Zc (A) = 23. 329 4
25..(A) -28. 332 4
22.(A)-23. 834 3
Chromaticity exposure number
GB/T 3977
Table 2 (end)
xic(a)
Cloud color coordinates
Sum at 10 nm intervals:
Zrm(A) =11. 664 6bzxz.net
2y.(3) -11. 664 4
Zzr(A)-11. 664 5317 3
0- 281 4
0, 000 0
Sum at 5 nm intervals:
Zc (A) = 23. 329 4
25..(A) -28. 332 4
22.(A)-23. 834 3
Chromaticity exposure number
GB/T 3977
Table 2 (end)
xic(a)
Cloud color coordinates
Sum at 10 nm intervals:
Zrm(A) =11. 664 6
2y.(3) -11. 664 4
Zzr(A)-11. 664 5
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