A few more things that are missing (i just ran into this while trying to convert some private scripts from imagemagick to graphicsmagick-imagemagick-compat:
graphicsmagick-imagemagick-compat does not know about the Alpha channel
-- it knows about Opacity, but the convert wrapper apparently isn't
smart enough to translate between the synonyms. (or is alpha actually
1-opacity? i'm not sure)
graphicsmagick-imagemagick-compat lacks the -fx functionality.
-operator provides a less flexible alternative, but it is not capable of
matching the full power of -fx, afaict. i see no other equivalent
replacement.
This means i've had to revert to imagemagick, after a fair amount of
debugging and searching for the promised "compatibility".
Perhaps the long description of the package should indicate that it is
not fully-compatible, and the specifics of the known incompatibilities
could be dropped into
/usr/share/doc/graphicsmagick-imagemagick-compat/incompatibilities.txt
thanks,
--dkg
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