RGB to HSL The R,G,B values are divided by 255 to change the range from 0..255 to 0..1: R' = R/255 G' = G/255 B' = B/255 Cmax = max(R', G', B') Cmin = min(R', G', B') Δ = Cmax - Cmin Hue calculation: Saturation calculation: Lightness calculation: L =