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equations for vignette filter
I'm not currently a Gimp user, but I'd like to know the equations used for the vignette filter. Are they anywhere in the documentation, or just buried in the source code somewhere?
The current version Gimp 2.10 uses a GEGL (see operation for creating a vignette. The page for describing the feature is and bottom of that page, a link to the code.

In earlier versions of Gimp a vignette effect can be 'hand-made' usually by filling a fuzzy selection or application of a gradient in a layermask.

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Thank you.

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