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LUV color space

CIELUV 1976 (L*, u*, v*) is a color space adopted by the International Commission on Illumination (CIE) in 1976, as a simple-to-compute transformation of the 1931 CIE XYZ color space, but which attempted perceptual uniformity:

\( u^*=12L^*(u'-u_n) \)

\( v^*=13L^*(v'-v_n) \)

\( L^*=116(Y/Y_n)^{1/3}-16 \)
where n designates color coordinates of white light point.

The cylindrical version of CIELUV is known as CIE LChuv, where C*uv is the chroma and huv is the hue:

\(h_{uv}=\displaystyle\arctan\frac{v^*}{u^*}\)

\(C^*_{uv}=\sqrt{*u^*)^2+(v^*)^2}\)

 \(s_{uv}=\displaystyle\frac{C^*_{uv}}{L^*}\)

LUV diagram
LUV numbers LUV coordinates

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