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video alpha Channel

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Jason Pierson
video alpha Channel
on Oct 15, 2010 at 3:51:32 pm

I purchased a .mov video clip with a built in alpha channel form istock. The video is an animated santa over a black background, and the end of the clip is a white solid of the video over black background (I assume this is the alpha channel) how do i use this alpha channel to key out the main video clip.
Thanks Jason


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Dave LaRonde
Re: video alpha Channel
on Oct 15, 2010 at 5:09:35 pm

It's easy: use the B&W clip as a luma matte for the color clip. It's all part of the wonderful world of Track Mattes:

http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103906...

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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