>> 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