Module Blend
Color blending. Inspired from the implementation of Ghostscript
type mode
=
|
Normal
|
Multiply
|
Screen
|
Overlay
|
ColorDodge
|
ColorBurn
|
Darken
|
Lighten
|
Difference
|
Exclusion
val blend : mode -> int -> int -> int
blend blendmode src dst
computes blending of one color component.