CIE 1964 uniform colour space

3-dimensional, approximately uniform colour space produced by plotting in rectangular coordinates *U**, *V**, *W** quantities defined by the equations:

*W** = 25 *Y*^{1/3} - 17

*U** = 13 *W** (*u* - *u*_{n})

*V** = 13 W* (*v* - *v*_{n})

NOTE 1 *Y*, *u*, *v* describe the colour stimulus considered, and *u*_{n}, *v*_{n} describe a specified white achromatic stimulus, where _{}.

See also "CIE 1976 uniform chromaticity scale diagram"

NOTE 2 The difference between 2 stimuli, ∆*E**, is defined as the Euclidean distance between the points representing them in *U***V***W** space and calculated as:

∆*E** = [(∆*U**)^{2} + (∆*V**)^{2} + (∆*W**)^{2}]^{1/2}.

NOTE 3 This colour space is obsolete (except that it is still used in the calculation of colour rendering index). The currently recommended object colour spaces are CIELAB and CIELUV.

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