Auto Tones node
The Auto Tones node finds the minimum and maximum values in the input texture and tone maps it to the full 0.0 - 1.0 range.

Inputs
The Auto Tones node requires a grayscale input texture.
Outputs
The Auto Tones node provides a single grayscale texture.
Parameters
The Size of the buffers used to find the mininum and maximum values for the input image. If the input has small details a higher resolution buffer might be needed to capture precise min and max values.
Note: The output itself will not be buffered.