https://bugs.kde.org/show_bug.cgi?id=374972

--- Comment #11 from reptilli...@live.com ---
Update - Now, all that is needed is to get mixColors operation to work on the
code, and the basic version of high pass is finished. Decided to skip grayscale
version as using desaturate filter mask and high pass should fix that issue
nicely, and it would be tremendously difficult to mix the current high pass
with desaturate. I'm not sure about DC preservation, but I hear that direct
math isn't possible, so I don't know if you could use overlay mode. Mix colors
could make it possible to generate average colors. I might even create average
colors filter which averages all the colors except for alpha colors.

Also, for reference -
https://github.com/andymeneely/Gimp-Scripts/blob/master/examples/high-pass.scm

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