I would like to know how to use GIMP in the following script since
ImageMagick's edge detection sucks compared to Gimps defaults with
Sobel. Also it would be nice to not have it write the file at every

I don't care either way if the whole thing is moved to Gimp as long as
the edge detection is.

mplayer test.mkv -vo png
for img in `ls *.png`;
do convert -fx G $img $img && convert -edge 2 $img $img && convert
-negate $img $img;
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