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Replace black/white parts of an image with ImageMagick

Replace white sections of an image with transparency:

$ convert myimage.jpg -transparent white myimage.png

If it’s not pure white, and you need a bit of extra:

$ convert myimage.jpg -fuzz 10% -transparent white myimage.png

If you want to additionally crop the image to the nontransparent portion:

$ convert myimage.jpg -fuzz 10% -transparent white -trim myimage.png