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After Effects Rotoscoping

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Drew wilsonAfter Effects Rotoscoping
by on Apr 15, 2016 at 2:53:13 am

Hi there, I'm trying to do a few second Roto around a hand in front of a replaced computer screen. My issue is when I export it as a prores 444 with alpha channel my final result in my export has a black boarder around my Roto path. I have done allot of rotoscoping before and never had this issue, any ideas?


Drew Wilson

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Dave LaRondeRe: After Effects Rotoscoping
by on Apr 15, 2016 at 1:12:44 pm

It sounds like you're doing the final composite in an editing application. I'd do the whole shot in AE -- more control, y'know.

But to address your immediate problem, it's an easy fix. Re-render the shot, but this time change the type of alpha channel from Premultiplied to Straight, i.e. NOT Premultiplied. That'll fix it.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA

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