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How to export a separate alpha matte video for use in iPad application

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Will Heine
How to export a separate alpha matte video for use in iPad application
on Sep 17, 2013 at 9:51:37 pm

This is probably a lot easier than I'm making it but I am stuck on how to come away with a matte file that is the reverse of a file with dancing person in it. So the dancing person has an alpha channel and I want a separate video file that contains moving pixels that block the transparent areas in the dancing woman layer.

Any help would be greatly appreciated.

Will


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Dave LaRonde
Re: How to export a separate alpha matte video for use in iPad application
on Sep 17, 2013 at 11:50:22 pm

I'd render out a movie in a codec that supports alpha channels and render out the Alpha. This is best done using the AE Render Queue, and adjusting the Output Module.

Okay, maybe you DON'T have to use a codec that supports alpha channels, but I'd do it. You could check.

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


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Cassius Marques
Re: How to export a separate alpha matte video for use in iPad application
on Sep 18, 2013 at 11:54:35 am

import your dancing footage, drag it to the create a new composition button. Create a solid, put it below the footage and set it's tracking matte to alpha inverted.

Render that out to a format that supports alpha as Dave suggested.


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Walter Soyka
Re: How to export a separate alpha matte video for use in iPad application
on Sep 18, 2013 at 1:08:12 pm

[Will Heine] "I am stuck on how to come away with a matte file that is the reverse of a file with dancing person in it. So the dancing person has an alpha channel and I want a separate video file that contains moving pixels that block the transparent areas in the dancing woman layer."

Add your item to the render queue, then click on the name of your output module to edit it. Under Video Output, change the Channels from RGB or RGB+Alpha to Alpha. An alpha-only output module will render a matte.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


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