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exporting quicktime with alpha channels

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airkoganexporting quicktime with alpha channels
by on Sep 28, 2006 at 7:11:17 pm

I'm trying to export a quicktime movie with an alpha channel and I have no idea how to do it. Can anyone help me?

Thanks,

Alex


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promoboyRe: exporting quicktime with alpha channels
by on Sep 28, 2006 at 11:50:16 pm

In your render settings choose a codec that supports alpha channels, like Animation (lossless--excellent quality, large file size), then choose Millions of Colors+ and RGB+Alpha. You'll have to choose whether you want your alpha to be straight or premultiplied--what you plan on doing with your footage will dictate which one you'll want. Do a search for Aharon Rabinowitz (I hope I spelled his name right) on the Creative Cow for his overview of the difference between them. He's also a forum leader in the After Effects forum--go there, click on his head, scroll down and choose his Straight/Premultiplied tutorial. Good stuff.

Hope this helps get you started.

Mike.


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