CIE 1964 standard colorimetric system [X10, Y10, Z10]
system for determining the tristimulus values of any spectral power distribution using the set of reference colour stimuli [X10], [Y10], [Z10] and the 3 CIE colour-matching functions adopted by the CIE in 1964
NOTE 1 This standard colorimetric system is applicable to centrally-viewed fields of angular subtense greater than about 4° (0,07 rad).
NOTE 2 When this system is used, all symbols that represent colorimetric measures are distinguished by use of the subscript 10.
See also CIE 15 Colorimetry