### 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: $$h_{uv}=\displaystyle\arctan\frac{v^*}{u^*}$$ $$C^*_{uv}=\sqrt{*u^*)^2+(v^*)^2}$$  $$s_{uv}=\displaystyle\frac{C^*_{uv}}{L^*}$$

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