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Filing flat colors with GIMP' MultiFill Script-Fu
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A. Install:
The Multifill script is an external plugin for GIMP , part of the "Flatting tools", made by Rob Antonishen ( http://ffaat.pointclark.net ). The script was written for Gimp 2.6 and didn't received update since June 2013, so expect little bugs here and there while using it with Gimp 2.8. The main bug : the script can't really 'exit' and fall in infinite loop sometime, but the work is done, and Gimp allows you to save export the result ( then you have to 'killall gimp' in a terminal ).
Download: http://registry.gimp.org/node/13251 the script, and copy it in your /home/<username>/.gimp-2.8/scripts folder. Two new filters should appears in your GIMP under Menu > Filter > Flatting.
B. Preparations:
Multifill filter takes a bit of time to compute.
Our image is hi-resolution, and to speed-up the process, we need to simplify a bit the picture, and save the result to a temporary image.
In my case, I keep only the big pile of potions, and painted in black all the details around.
This is a way to tell to Multifill : work only on the 'white' part of the picture, and ignore the black color.
My temporary image is a PNG.
C. Custom palette:
Multifill can fill with random colors. It can also pick random color from an existing palette.
I built a custom palette with GIMP from a part of the picture I colored manually.
Documentation for cutom palette :
https://docs.gimp.org/en/gimp-palette-dialog.html