sat function

The sat function calculates the saturation of a color and returns it. The saturation ranges from 0 to 1. To construct a color from hue, saturation, and luminance values, use the hsl or hsla functions.

Examples:

sat(rgb(1, 0, 0))        ; 1.0
sat(rgb(0.5, 0.4, 0.3))  ; 0.2499...
sat(hsl(1.5, 1, 0.5))    ; 1.0

See Also
red function
hue function
lum function
alpha function
Writing direct coloring algorithms