| Definition: | a system for determining the tristimulus values of any spectral power distribution using the set of reference colour stimuli [X], [Y], [Z] and the three CIE colour-matching functions X adopted by the CIE in 1931
NOTE 1 – X is identical to V(λ) and hence the tristimulus values Y are proportional to luminances.
NOTE 2 – This standard colorimetric system is applicable to centrally-viewed fields of angular subtense between about 1° and about 4° (0.017 and 0.07 rad).
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