color-rgb-to-hsl

color-rgb-to-hsl is a compiled Lisp function in `color.el'.

(color-rgb-to-hsl RED GREEN BLUE)

Convert RGB colors to their HSL representation.
RED, GREEN, and BLUE should each be numbers between 0.0 and 1.0,
inclusive. Return a list (HUE SATURATION LUMINANCE), where
each element is between 0.0 and 1.0, inclusive.