CIELUV is an [[Adams chromatic valence color space]], and is an update of the [[CIE 1964 color space|CIE 1964 (''U''*, ''V''*, ''W''*) color space]] (CIEUVW). The differences include a slightly modified [[Lightness (color)|lightness]] scale, and a modified uniform chromaticity scale in which one of the coordinates, ''v''′, is 1.5 times as large as ''v'' its [[CIE 1960 color space|1960 predecessor]]. 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