From the course: After Effects Compositing: 4 Color Keying

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Create an animated g-matte selection without roto or keyframes

Create an animated g-matte selection without roto or keyframes - After Effects Tutorial

From the course: After Effects Compositing: 4 Color Keying

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Create an animated g-matte selection without roto or keyframes

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- As you may have already noticed elsewhere, there are automatic ways to create a g-matte or c-matte just by expanding or contracting a high contrast matte. In this lesson, I'll focus on how to automatically narrow down the area that needs to be keyed as the first of three passes on a problematic key like this one. Now, the problem here is that our costume in this scene has quite a bit of blue in it. Looking at the info panel over there you can see that this is a navy blue sleeve and collar on this shirt, and even the hat has a quite a bit of blue. So, we'll do our best with this. To start, I'll just go to the initial key that I had already set in a previous lesson, and I'll raise 'Clip Black' to about '9' to clean that up. Now, normally, I would be trying to preserve the edge here, while filling the holes in the foreground, but in this case, my instruction to you is choose a 'Delta' of '1' between black and white. In other words, input a value that is just one higher than black. I…

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