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Advanced Rotoscoping over Still Background Question

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Daniel Hybiak
Advanced Rotoscoping over Still Background Question
on Oct 17, 2011 at 12:49:26 am

Hello,

I'm trying to figure out a method of expediting a rotoscoping workflow for a demo project I'm working on. Here is the scenario of the shot:

- still camera
- still background
- person walks in and moves around the background

The shot was originally created using green screen footage of the actress moving around, and composited over a CG environment (CG room, window, etc.)

We no longer have access to the original green screen footage however, and must work with the final, post-composited shot.

Basically, is there a method of telling After Effects to take the background (since she walks into the frame), and anything that doesn't match that background over the next X amount of frames, mask it? It seems like this would be possible.

Anything to avoid manual rotoscoping.

Thank you.


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Tudor "Ted" Jelescu
Re: Advanced Rotoscoping over Still Background Question
on Oct 17, 2011 at 9:14:48 am

If you have a clean plate ( a frame of the background without the actor) you can try to pull a difference matte.
http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c11...
Another option would be RotoBrush.
http://help.adobe.com/en_US/aftereffects/cs/using/WS3bf812c123007fb8513559d...

Tudor "Ted" Jelescu
Senior VFX Artist


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