CIE LCH Color System

The CIE LCH color system is derived from the L*a*b* system.

Specifies the colors as a combination of Luminance (achromatic perception, the L of L*a*b*), Chroma (degree of purity), and Hue (position along a colored sequence). The Chroma and Hue correspond to the a*b* coordinates expressed in polar form.