From the course: After Effects Apprentice: 13 Paint Roto and Puppet

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Creating a matte

Creating a matte - After Effects Tutorial

From the course: After Effects Apprentice: 13 Paint Roto and Puppet

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Creating a matte

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Now the first step to using Roto Brush is to choose a frame where you can see the entire object that you need to cut out, or failing that, as much of it as possible. In this case these tulips don't move that much and they're always fully in the frame. So what frame I use for my starting point is not all of that important. But the frame you choose is what's going to be called a Base Frame. Roto Brush is going to take the information you create on that frame and propagate that information earlier and later in time. We'll just go to one second even now just for fun. Next, you need to select the Roto Brush tool. It's this large brush painting out this little man. I'll select the tool and as I move over the Layer panel, you'll see I have a circle that indicates the size of our brush. It's also green in color with a plus sign in the middle, which indicates I'm going to add to my alpha channel. I'm going to be working on my foreground not my background. You can resize the Roto Brush, just as…

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