OptionalchannelsOptionalgammaSpecifies the shape of the curve connecting the two points.
OptionalinputInput upper bound.
OptionalinputInput lower bound.
OptionaloutImage to which to output.
OptionaloutputOutput upper bound.
Optionaloutputoutput lower bound.
Specify which channels should be processed. To process the alpha as well, specify the channels as [0,1,2,3] for RGBA images and [0,1] for GREYA.