ffmpeg -i %IN% -i %IN% -lavfi
"[0]transpose=1[left];[1]transpose=2,geq=r='255-r(X,Y)':g='255-g(X,Y)':b='255-b(X,Y)'[right];[left][right]hstack"
-y %OUT%
Cant you use here negate filter instead of geq?
oops, yes that would be better. I did search for "invert" and didn't
find it...
Michael
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