Tones Map node
The Tones Map node is variadic and remaps images, given input and output tone intervals. This node will not affect the alpha channel of the image. If necessary, the remap operation is extrapolated linearly beyond the specified intervals.

Inputs
The Tones Map node accepts one or more RGBA input textures.
Outputs
The Tones Map node outputs one or more RGBA textures.
Parameters
The Tones Map node accepts 4 parameters:
the minimum and maximum input tones
the minimum and maximum output tones