Legacy ImageMagick Discussions Archive

Hi everyone.

I have 2 png images of the same size and one of them is a mask: a white circle in the center with every other pixels black.
I would like to obtain a cropped image with the original one substituting the white circle and with the other pixels black.

I've tried with this tutorial, typing but I've obtained an image equal to the mask.

Have you got any suggestions?

Thanks in advance!

try either of these (assuming your mask is a white circle surrounded by black)

convert mask.png image.png mask.png -compose multiply -composite result.png

convert image.png mask.png -compose copy_opacity -composite -compose over -background black -flatten result.png

See IM Examples, Masking, Mathematical and Alpha Composition
http://www.imagemagick.org/Usage/masking/#compose