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13.1, 13.0, 12.2, 12.1, 12.0, 11.3, 11.2, 11.1, 11 or later
Linux, Mac, Windows
GW Happy Clamping Toolset
Full breakdown available https://www.gavinwhittaker.info/post/what-s-the-difference-happy-clamping
The toolset includes 2 separate notes (both separate gizmos and can be used separately)
GW Happy Clamper:
This is a simple but handy tool which will clamp the alpha in the stream based on the value that you set: everything above that value is clamped to 1.00 (with some extra controls for eroding or expanding and blurring the alpha)
Difference keyer with clamping controls.
This is a handy tool for when you need to quickly extract a difference based alpha and clamp the output based on custom settings.
There are two methods available depending on whether you need a hard or softer edge alpha.
You can then either
1) Clamp the outgoing alpha based on a minimum value (all alpha pixels below this will be clamped to 1).
2) Use the Gain slider to create a softer alpha based on the difference between inputs.
Hope these are useful, always open to feedback.