2D Modifier - Apply a function independently on RGBA channels
This modifier applies an arbitrary function independently on each or some of the
RGBA
channels of the image.
It's a generic modifier that can be used in many different ways.
Here are the parameters for the example above:
Channels
Function Parameters
Parameters
Channels (Texture Channel Flags) : Select which channels will be modified
Function (Percentage Function) : Select how the channels get modified