CIE L*a*b* Color System

The CIE L*a*b* color system is similar to the L*u*v* system..

Specifies a luminance and two chrominance components. These parameters are related by a non-linear transform to the CIE XYZ coordinates, so that they represent the colors in a uniform way: two colors separated by the same distance anywhere in the gamut have the same visual contrast.