what is premultiplied image or premultiplication in compositing? if you are going to reply, please explain the best you can with not to much jargon.
cheers also if you know where i can get some diagrams to help explain this in more detail that would be even better
Look at the Shake 4 user manual page #421-436 explains it really well with pictures and everything.
http://manuals.info.apple.com/en/Shake_4_User_Manual.pdf
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