Chris,

I would take a close look at each of your input images. There may be 
something odd about them.

Use convert image.png -verbose info:

Also you could post a link to an example and we could examine it. 
(Post the inputs and output for one example that has a problem)

Fred



>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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