Here's an interesting question.

If I say.

montage *.png -background black output.png

I get the background in my output.png which appears to be black, however when I 
tell IM to treat black as transparent I get it largely being transparent 
however occasionally what seems to happen is I get some trace amount of black 
around my input images that I've montaged, this leads me to think that when I 
say black being transparent. Which I would assume to be RGB(0,0,0) in some 
instances my background gets filled in with RGB(1,1,1) so when then it doesn't 
appear transparent. Is this anticipated ? I would say that the appropriate 
action would be to use a -fuzz of like 1 or 2% however if that doesn't address 
my issue, what would your other suggestions be ?

Cheers
Chris Howell
Software Engineer
the PYXIS innovation - Common Ground for Digital Earth
Kingston, Ontario, Canada
w: www.pyxisinnovation.com
p:613-389-6619
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