From the course: After Effects Compositing: 4 Color Keying

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Begin a color key with a g-matte

Begin a color key with a g-matte - After Effects Tutorial

From the course: After Effects Compositing: 4 Color Keying

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Begin a color key with a g-matte

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- Most green screen foreground scenes don't make use of the entire frame and so it can be helpful to start with what is most commonly called a garbage mat or G Mat for short. The process is also known as Rig Removal. The basic idea here is to mask out the areas of the background that are useless to the foreground because the subject never crosses them. So in this scene we can see that although we've got some movement by our talent it's all covered by this popup green screen, and so at the very least we want to get rid of all of the scenery that was behind him. Now we're gonna be able to take care of a lot of it. Just using a simple rectangle mask. So I'll start with that and you can see that I need to make some additions and subtractions to it. So I can just do that with the pen tool. By adding a point down here I can pull the corner in but I'm gonna do it right where his elbow crosses. How bout right there! And I'm just gonna be careful to both add and drag it. A little tricky to do…

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