Re: Merging two images

On Thu, 29 Oct 2009, Felix Saphir wrote:
>
> The next thing for me is to extract parts of the resulting image
> (rectangular and polygon shapes), and I think, it's going to be an
> interesting journey :)

That sounds fun.  Since raster images are rectangular, you will need 
to do something with the opacity channel to make the hidden pixels 
transparent, and perhaps by using composition.  There is clip mask 
functionality in GraphicsMagick which probably could be used.  There 
is also a poorly documented functionality in which a black/white image 
can be used to mask out pixels from being changed by an image 
processing operation, but that only works if the current image is 
changed, and not for algorithms which produce a new image.

Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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