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The CIE positions D65 as the standard daylight illuminant: [D65] is intended to represent average daylight and has a correlated colour temperature of approximately 6500 K. CIE standard illuminant D65 should be used in all colorimetric calculations requiring representative daylight, unless there are specific reasons for using a different illuminant.
A list of standardized illuminants, their CIE chromaticity coordinates (x,y) of a perfectly reflecting (or transmitting) diffuser, and their correlated color temperatures (CCTs) are given below. The CIE chromaticity coordinates are given for both the 2 degree field of view (1931) and the 10 degree field of view (1964). [1]
An illuminant is characterized by its relative spectral power distribution (SPD). The white point of an illuminant is the chromaticity of a white object under the illuminant, and can be specified by chromaticity coordinates, such as the x, y coordinates on the CIE 1931 chromaticity diagram (hence the use of the relative SPD and not the absolute SPD, because the white point is only related to ...
The y G coordinate too is the same, while x G is halfway between EBU Tech 3213's x G and SMPTE C's x G. The resulting BT.709 color space is almost identical to that of the BT.601-6 used by PAL and SMPTE C, and covers 35.9% of the CIE 1931 color space . [ 19 ]
When two or more colors are additively mixed, the x and y chromaticity coordinates of the resulting color (x mix,y mix) may be calculated from the chromaticities of the mixture components (x 1,y 1; x 2,y 2; …; x n,y n) and their corresponding luminances (L 1, L 2, …, L n) with the following formulas: [16]
DCI-P3 covers 53.6% [4] of the CIE 1931 chromaticity diagram (see inset image), which describes the color gamut of human color vision. A smaller, practical gamut for comparison is the Pointer's gamut, which consists of diffusely reflecting surface colors. DCI-P3 covers 86.9% of Pointer's gamut, [5] while in comparison, Rec. 709/sRGB only covers ...
Through the application of the 3x3 matrix below (derived from the inversion of the color space chromaticity coordinates and a chromatic adaptation to CIE Standard Illuminant D50 using the Bradford transformation matrix), the input image's normalized XYZ tristimulus values are transformed into RGB tristimulus values.
For example, the white point of an sRGB display is an x, y chromaticity of (0.3127, 0.3290), where x and y coordinates are used in the xyY space. (u′, v′), the chromaticity in CIELUV, is a fairly perceptually uniform presentation of the chromaticity as (another than in CIE 1931) planar Euclidean shape.