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Creating an alpha channel in After Effects for Media Composer

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Steve RogalinskiCreating an alpha channel in After Effects for Media Composer
by on Sep 2, 2013 at 8:29:05 am

I have searched high and low and cannot seem to find an answer to what I thought was a simple thing.

I want to create some effect mattes in After Effects to use in Media Composer.

If I import footage of, say, a light leak or film burn into After Effects, how would I create an alpha channel so that I can use that effect as a real time matte key in Media Composer?

I know how to export an alpha channel, but I cannot figure out how to create one.

Thanks!

Steve Rogalinski


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Walter SoykaRe: Creating an alpha channel in After Effects for Media Composer
by on Sep 2, 2013 at 12:34:37 pm

With footage like light leaks, you can can use the free Red Giant Unmult effect [link] effect to quickly create an alpha channel from the source image.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
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