Unless I'm misunderstanding the problem, patching like this would do the job?

http://skitch.com/keith/s36p/quartz-composer

I'd recommend Sprite rather than Billboard.

This is nicer, but makes grey areas (neither black nor white) semi- transparent -- not sure if that's what he was looking for here. If so, it's probably a lot more reliable than arbitrarily selecting a cutoff value like the core image filter version though :)

--
[ christopher wright ]
[EMAIL PROTECTED]
http://kineme.net/

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