What is ISO/CIE 11664-1 - CIE standard colorimetric observers about?
ISO/CIE 11664-1 is a safety standard on colorimetry.
ISO/CIE 11664-1 specifies colour-matching functions for use in colorimetry.
Two sets of colour-matching functions are specified:
Colour-matching functions for the CIE 1931 standard colorimetric observer.