This is probably quite easy, but I can't solve it at the moment:
I would like to suerpose the attached images (i.e. rather their larger
originals) such that I can see both of them.
composite -dissolve rect.jpg correct.jpg overlay.jpg
gives a quite what I desire, but I would like to restict the overlay to
the non-white region of 'rect.jpg'. I already generated a mask by
convert rect.jpg -threshold 99.9% mask.png
but I don't get any further. I read that 'composite' can take a third
image as a mask, but the 'dissolve' option somehow seems to affect that.
.......
The background behind this question is image rectification. The image
'rect.jpg' was rectified by use of IM such that it matches with the
perspectively correct image. This works well in the region surrounded by
the match points, but gives poor results the further you go out of that
surrounded area.
So in the end, I would like to use several rectified patches and map
them on the perspectively correct image. Therefore I have to limit each
supersposition area.
Greetings from Germany
Wolfgang Hugemann
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