A GiMP effect for turning an image into a sketch.
Implementation of a technique by Vidar Madsen.
Taken from: https://www.gimp.org/tutorials/Sketch_Effect/
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Get gimptool.
sudo apt-get install libgimp2.0-dev
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Run in terminal:
chmod 544 sketchify.py $(gimptool-2.0 -n --install-script sketchify.py)/../plug-ins/
See official guide.
My sister and I being sketch models :-)