Procedural Texture Saturation Mask (Part 3)

A variable saturation mask can be a very useful tool. Here we take the third 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 review and improve the adjustments previously used and add an extra one for further control. In this, we are showing something of the thinking process that goes on when creating a Procedural Texture control, getting something working then looking to improve it further.
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