This document specifies colour-matching functions for use in colorimetry. Two sets of colour-matching functions are specified.

a)Colour-matching functions for the CIE 1931 standard colorimetric observer.
This set of colour-matching functions is representative of the colour-matching properties ofobservers with normal colour vision for visual field sizes of angular subtense from about 1° to about 4°, for vision at photopic levels of adaptation.

b)Colour-matching functions for the CIE 1964 standard colorimetric observer.
This set of colour-matching functions is representative of the colour-matching properties ofobservers with normal colour vision for visual field sizes of angular subtense greater than about 4°, for vision at sufficiently high photopic levels and with spectral power distributions such that noparticipation of the rod receptors of the retina is to be expected.

Cross References:
CIE S 017
CIE D001
CIE 39.2-1983
CIE S 004-2001
CIE 80-1989
CIE 15
ISO 11664-2:2007


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