17-159

CIE 1976 L*u*v* colour space

3-dimensional, approximately uniform colour space produced by plotting in rectangular coordinates L*, u*, v* quantities defined by the equations:

        

 where

        ƒ(Y/Yn) = (Y/Yn)1/3                                               if (Y/Yn) > (6/29)3

        ƒ(Y/Yn) = (841/108) (Y/Yn) + 4/29                          if (Y/Yn) ≤ (6/29)3

        and Y, u', v' describe the colour stimulus considered

        and  describe a specified white achromatic stimulus

Equivalent term: "CIELUV colour space"

NOTE Approximate correlates of lightness, saturation, chroma, and hue may be calculated as follows:

CIE 1976 lightness

        L* = 116 ƒ(Y/Yn) - 16

where

        ƒ(Y/Yn) = (Y/Yn)1/3                                                     if (Y/Yn) > (6/29)3

        ƒ(Y/Yn) = (841/108) (Y/Yn) + 4/29                     if (Y/Yn) ≤ (6/29)3

CIE 1976 u, v saturation

       

CIE 1976 u, v chroma

       

CIE 1976 u, v hue angle

       

See also CIE 15 Colorimetry

See also ISO 11664-5:2009(E)/CIE S 014-5/E:2009 Colorimetry - Part 5: CIE 1976 L*u*v* Colour Space and u', v' Uniform Chromaticity Scale Diagram

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