Begin a color key with a g-matte

- 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 so if I just add it and then drag it…