I am using the UserBackdrops patch to build one of those "Please step out of 
the frame" composition for iChat and Photobooth. I am trying to get the 
foreground image only - just the "talking head" with a zero opacity background 
- so I can modify the it in  several ways before combining it with a new 
background.

Unfortunately the output of UserBackdrops scraps away the alpha values. Feeding 
a fully transparent image into InputBackgroundImage results in an opaque grey 
background.

I've looked into Backdrop.qtz and found "Image With Alpha", but I am not sure 
how to access it. Any tipps?

Thanks _______________________________________________
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