From the course: After Effects CC 2018: Editors and Post Essential Training

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Masks

Masks

- [Instructor] Masks are a tool used to hide or reveal portions of our footage. After Effects has a few ways to create them onto your layer and here we'll see what the tools offer us and how we can manipulate them. So here's a standard 2D layer and with my sunset layer selected, I can come up here to my mask creation tools and you'll see I have these different shapes, rectangle, rounded rectangle, ellipse, polygon, and star, and I can also create masks using the pen tool. Now it's important to note that these very same tools will create shape layers if you have nothing selected in your timeline, and that's an important distinction because shape layers are something else entirely, which we'll cover in another movie but in order to create masks, it's very important to have first a layer selected. So with that sunset layer selected, let's come over here and take a look at our rectangle tool. Now as I click and drag inside my composition window, you'll see I can create a square, I can…

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