Does anyone know of some documentation on UserBackdrops and Replace BG? I've 
looked into Photo booth.app/Contents/Resources/Effect.qtz but I'm not sure how 
they relate.

regards,
 Armin



On 10.01.2011, at 12:35, Armin Wagner wrote:
> 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 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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