CIELUV

CIELUV and CIELAB were adopted simultaneously by the CIE when no clear consensus could be formed behind only one or the other of these two color spaces.

CIELUV uses Judd-type (translational) white point adaptation (in contrast with CIELAB, which uses a von Kries transform).

[1] This can produce useful results when working with a single illuminant, but can predict imaginary colors (i.e., outside the spectral locus) when attempting to use it as a chromatic adaptation transform.

[2] The translational adaptation transform used in CIELUV has also been shown to perform poorly in predicting corresponding colors.

CIELUV is based on CIEUVW and is another attempt to define an encoding with uniformity in the perceptibility of color differences.

corresponds to the same ΔE*uv as a lightness difference of ΔL* = 1, in direct analogy to CIEUVW.