CIE 1931 standard colorimetric system [*X*, *Y*, *Z*]

system for determining the tristimulus values of any spectral power distribution using the set of reference colour stimuli [*X*], [*Y*], [*Z*] and the 3 CIE colour-matching functions _{} adopted by the CIE in 1931

NOTE 1 _{} is identical to *V*(*λ*) and hence the tristimulus values *Y* are proportional to values of luminance.

NOTE 2 This 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 The CIE 1931 standard colorimetric system can be derived from the CIE 1931 RGB colorimetric system using a transformation based on a set of 3 linear equations. The CIE 1931 RGB system is based on 3 real monochromatic reference stimuli.

See also CIE 15 *Colorimetry*

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