In
colorimetry, the
CIE 1976 (L*, u*, v*) color space, commonly known by its abbreviation
CIELUV, is a
color space adopted by the
International Commission on Illumination (CIE) in 1976, as a simple-to-compute transformation of the 1931
CIE XYZ color space, but which attempted
perceptual uniformity. It is extensively used for applications such as computer graphics which deal with colored lights. Although additive mixtures of different colored lights will fall on a line in CIELUV's uniform
chromaticity diagram (dubbed the
CIE 1976 UCS), such additive mixtures will not, contrary to popular belief, fall along a line in the CIELUV color space unless the mixtures are constant in
lightness.