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Keying an object using a matt??

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Adam KoubekKeying an object using a matt??
by on Oct 10, 2011 at 1:03:22 am

I've seen this done but can't for the life of me figure out how it's done. If I have a stable footage, where only the object I want to key out is moving, can I somehow use the still image of the background as a matt to key out the moving object? The footage has a green screen but it's not lit well enough to key. I'd appreciate any help, thank you.

-Nack-


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ben g ungurenRe: Keying an object using a matt??
by on Oct 10, 2011 at 2:53:20 am

It's called a "Difference Matte" and is a filter in AE. You'll need a still image of your video to use as the matte to calculate the difference. I usually use a precomp and time remap with a single keyframe where the object I'm keying out isn't there.

Note that Difference Matte isn't going to get you as nice a result as something like Keylight usually will. But give it a go at any rate, see how it looks....

Ben Unguren
Motion Graphics & Editing
http://www.mostlydocumentary.com


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Adam KoubekRe: Keying an object using a matt??
by on Oct 10, 2011 at 5:34:10 am

Thanks a bunch. I'm just trying to avoid a whole bunch of roto and this should absolutely help out. Thanks again.

-Nack-


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