Input[XYZ ]

Gain[XYZ ]

The Node returns a contrast gain of Input by Gain, using the following Ken Perlin formula:

Bias( 2 * Input - Gain ) * 0.5 ; if Input < 0.5

1 - Bias( 2 - 2 * Input - Gain ) * 0.5 ; otherwise

Gain and Input components should be in the range between 0.0 and 1.0