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How to key with a provided matte?

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Lillian YoungHow to key with a provided matte?
by on Jan 4, 2010 at 9:32:50 pm

A production house that was supposed to key out an actor instead provided the actor over grey. They also provided a separate matte layer (video), which looks like a perfect key.

My problem:

How do I apply that matte to the video so that it keys out the actor?

I tried keying out the gray, and did a pretty good job, but there's artifacts like underneath the arm cracks that I have no clue how to remedy despite extensive online research. So I figure that matte video they provided must have purpose. If I can apply that and call it a day, it'd be great.

Thanks!


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Dave LaRondeRe: How to key with a provided matte?
by on Jan 4, 2010 at 10:45:30 pm

Put the high-contrast B&W layer above the color layer, then use the upper layer as a Luma Matte.

It's all part of the groovy world of Track Mattes, which you can read about here:
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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Lillian YoungRe: How to key with a provided matte?
by on Jan 4, 2010 at 11:51:55 pm

Hey Dave :)

I figured out that I'd need to use a a track matte (not my area of expertise), but I was fiddling with the alpha matte.

Your suggestion resolved it. Thanks a million!!


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