I want to remove the dirty backgroung of an image, and make a monochrome
image with a better resolution (sheet music).
The best method I've found so far is this batch (under XP):
convert -resize "500%%" %1.jpg %1big.jpg
convert -monochrome %1big.jpg %1mono.jpg
A bigger -resize gives a better resolution, but if my source image is 1000x1200 big, the monochrome image is huge, and the batch takes minutes! Is there a more clever method?