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Exporting Alpha-Channel from Keylight (1.2)?

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Moritz Schefers
Exporting Alpha-Channel from Keylight (1.2)?
on Jan 3, 2012 at 4:55:33 pm

Hello CC,

i use keyed greenscreen-footage and want to use it as a foreground layer to an optical flare. After playing around i decided to export the keyed footage as quicktime-movie (rgb + alpha) and this works. My question is: does Keylight 1.2 output the alphachannel as well, so i could use it before exporting it?

I tried to duplicate the keyed footage and take the top one as Luma Matte (with mode "Screen Matte" instead of "FInal Result"), but this did not work that well.


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Chris Buttacoli
Re: Exporting Alpha-Channel from Keylight (1.2)?
on Jan 3, 2012 at 5:09:42 pm

Try precomposing the layer first to use it as an alpha matte.


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Moritz Schefers
Re: Exporting Alpha-Channel from Keylight (1.2)?
on Jan 3, 2012 at 5:24:32 pm

The keyed footage should be in a Pre-Comp, Keylight still applied to the Videolayer or the Comp? To what will the alpha-channel be applied to?


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Dave LaRonde
Re: Exporting Alpha-Channel from Keylight (1.2)?
on Jan 3, 2012 at 5:30:40 pm

Keylight doesn't create an alpha channel in the same way they're created in Photoshop. In AE, Keylight creates transparency on a layer.

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


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