The Desaturation expression desaturates its input, or converts the colors of its input into shades of gray, based a certain percentage.
Specifies the amount that each channel contributes to the desaturated color. This is what controls that green is brighter than red which is brighter than blue when desaturated.
Specifies the amount of desaturation to apply to the input. Percent can range from 0.0 (fully desaturated) to 1.0 (full original color, no desaturation).
Programmers: Define desaturated color
D, input color
I and luminance factor
L. The output will be
O = (1 - Percent)_( D.dot( I )) + Percent _ I