Calculation
where
- Y is the Y tristimulus value (relative luminance),
- (x,y) is the chromaticity coordinate in the CIE 1931 color space
- (xn,yn) is the chromaticity coordinate of the perfect diffuser (reference white)
The numbers in the subscript indicate the observer: two for the CIE 1931 standard observer and ten for the CIE 1964 standard observer.
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