color-saturate-hsl
color-saturate-hsl is a compiled Lisp function in `color.el
'.
(color-saturate-hsl H S L PERCENT)
Make a color more saturated by a specified amount.
Given a color defined in terms of hue, saturation, and luminance
(arguments H, S, and L), return a color that is PERCENT more
saturated. Returns a list (HUE SATURATION LUMINANCE).