Simple subtract
Posted: 2010-05-25T06:05:44-07:00
Hi there,
I'm not very much into image processing. But I'm very interested in solving my current issue with ImageMagick.
I want to subtract B.gif

from this image A.gif

So, only the white, dark blue and green pixels should be left. Like this:

But applying
results in

and
results in

It looks so me so simple. But the first result seems to be a combination of A and B, whereas the last result looks promising if the coloured pixels would have been copied out of A.
Any help is much appreciated!
Thanks,
Ralf
I'm not very much into image processing. But I'm very interested in solving my current issue with ImageMagick.
I want to subtract B.gif

from this image A.gif

So, only the white, dark blue and green pixels should be left. Like this:

But applying
Code: Select all
composite -compose subtract A.gif B.gif C.gif

and
Code: Select all
composite -compose subtract B.gif A.gif C.gif

It looks so me so simple. But the first result seems to be a combination of A and B, whereas the last result looks promising if the coloured pixels would have been copied out of A.
Any help is much appreciated!
Thanks,
Ralf