| 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 ˉx(λ), ˉy(λ), ˉz(λ) adopted by the CIE in 1931 Note 1 to entry: ˉy(λ) is identical to V(λ) and hence the tristimulus values Y are proportional to values of luminance. Note 2 to entry: The CIE 1931 standard colorimetric system is applicable to centrally viewed fields of angular subtense between about 1° and about 4° (0,017 rad and 0,07 rad). Note 3 to entry: The CIE 1931 standard colorimetric system can be derived from the CIE 1931 RGB colorimetric system using a transformation based on a set of three linear equations. The CIE 1931 RGB system is based on three real monochromatic reference stimuli. Note 4 to entry: See also CIE 15, Colorimetry. Note 5 to entry: This entry was numbered 845-03-28 in IEC 60050-845:1987.
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