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alpha channel problem taking grfx from AE to FCP

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Paul Levin
alpha channel problem taking grfx from AE to FCP
on Mar 20, 2012 at 5:59:32 pm

Hey all,

A client gave me a Targa sequence they wanted me to alter in AE, then add to a video I'm cutting in FCP. Problem is, when when I export the sequence as a quicktime, the edge of the alpha shows up in fcp. If i bring the targas directly into FCP, its fine. If I export another targa sequence, i get glitches in the alpha (some frames don't have an alpha channel) but the edges are fine.
My FCP sequence is pro-res 4444, I've tried rendering as pr4444, and animation, with rgb+alpha, and with the alpha channel separate.

any suggestions?


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Walter Soyka
Re: alpha channel problem taking grfx from AE to FCP
on Mar 20, 2012 at 6:15:43 pm

[Paul Levin] "A client gave me a Targa sequence they wanted me to alter in AE, then add to a video I'm cutting in FCP. Problem is, when when I export the sequence as a quicktime, the edge of the alpha shows up in fcp."

Is your alpha interpretation correct? Perhaps FCP is interpreting the alpha as straight instead of premultiplied on black (or maybe white)?

Select your rendered AE clip on the timeline in FCP, then Modify > Alpha > Black.

Alternately, render straight alpha from AE intead of pre-premultiplied.

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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Paul Levin
Re: alpha channel problem taking grfx from AE to FCP
on Mar 20, 2012 at 6:18:03 pm

forgot to add, Im AE CS5.5, fcp 7.0.3


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Dave LaRonde
Re: alpha channel problem taking grfx from AE to FCP
on Mar 20, 2012 at 7:45:45 pm

FCP defaults to using Straight rather than Premultiplied alpha channels. That's what I'd make.

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


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Paul Levin
Re: alpha channel problem taking grfx from AE to FCP
on Mar 20, 2012 at 8:08:54 pm

you are my hero. solved it, thanks.


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