developer.playcanvas.com
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Write documentation for fixing alpha 'fringing' issues on sprites and UI
https://forum.playcanvas.com/t/artifacts-on-our-2d-assets/14834/16
For Mac, there's a precompiled version with G'Mic here: https://www.partha.com/
Or you can get the order archived script here for GIMP: http://gimpchat.com/viewtopic.php?f=9&t=3153&sid=146b48dffece32c5712797f746214e3b&start=80#p277099
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Install the script via: https://docs.gimp.org/en/install-script-fu.html
Note to self: Kenney On Screen Controls asset pack (white) is a good example of this issue. To use the script above, you must add the alpha mask first and then use the script otherwise it misses editing the R channel