| Definition: | three-dimensional, approximately uniform colour space produced by plotting in rectangular coordinates L* u* v* quantities defined by the equations (2) :
X
Y, u', v'describe the colour stimulus considered and Yn, u'n, v'n describe a specified white achromatic stimulus
NOTE – Approximate correlates of lightness, saturation, chroma, and hue may be calculated as follows :
CIE 1976 lightness L* = 116 (Y/Yn)1/3 —16
Y/Yn 0,008 856
CIE 1976 u, v saturation suv = 13 [(u' — u'n)2 + (v' — v'n)2]1/2
CIE 1976 u, v chroma C*u, v = (u*2 + v*2)1/2 = L*suv
CIE 1976 u, v hue-angle hu, v = arctan [(v' — v'n)/(u' — u'n)] = arctan (v*/u*)
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