From the course: After Effects Compositing: 4 Color Keying

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Start with an animated and articulated g-matte

Start with an animated and articulated g-matte - After Effects Tutorial

From the course: After Effects Compositing: 4 Color Keying

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Start with an animated and articulated g-matte

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- The first step to master a tricky key is to accomplish as much as you can with a garbage matte or GMAT as you can see outlined here in green. It's purpose is to get rid of the areas of frame that don't belong. Now a mat that is articulated and reshaped over time is called an Articulated Matte or sometimes just Rotoscoping. And in this case we do need a matte that conforms directly to edges because if I turn off the mask you can see that the arm actually travels right off the area that's covered by the color key. So let's take a look at how both a well set GMAT and some good Articulated Roto can help a scene. Now the need for Roto here is obvious. Less obvious is the fact that this GMAT isn't as good as it could be. Now I don't just mean that it's a little sloppy over here on the right or doesn't track the fact that background moves a little bit. Notice, and this is particularly noticeable if I go to status view. That there's a bunch of noise here at the top that I could end up…

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