Procedural Texture Saturation Mask (Part 2)

A variable saturation mask can be a very useful tool. Here we take the second step in building one with the Procedural Texture filter. Note that we will be going very slowly with this, explaining the detail of how Procedural Texture works (as not everyone is familiar with this).
In this step we add variables to shift and stretch the histogram to enable full contrast of the saturation mask. We also show where to look for the various formula you can use.
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