Looking into info about GIMP for Krita development

#1
  1. Where can I find the code used for surface blur in GIMP source code?

  2. Is there any info besides from the source that tells me how all of the 5 options of GIMP High Pass mode works?

I plan to implement those two into Krita. Part of 2 has been almost done with nondestructive support. I’ll be able to do #1 as a filter mask/filter layer.

Bonus options, a way to replicate PS vibrance.

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#2

Found the info I need without using GIMP here - https://github.com/andymeneely/Gimp-Scripts/blob/master/examples/high-pass.scm

Also, I think I could do surface blur via editing unsharp mask filter. Looks like I may be able to address Krita filter limits issue.

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