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Chapter 1. Building Complexity > Animating Your Masks

Animating Your Masks

Masking is a simple way to selectively reveal portions of the layer or layers below it. This requires making one layer a mask layer and the layers below the masked layers.

By adding tweening to either or both the mask layer and the masked layers, you can go beyond simple, static peepholes and create dynamic masks that move, change shape, and reveal moving images. Use animated masks to achieve such complex effects as moving spotlights, magnifying lenses that enlarge underlying pictures, or "x-ray" types of interactions that show more detail within the mask area. Animated masks are also useful for creating cinematic transitions such as wipes, in which the first scene is covered up as a second scene is revealed; and iris effects, where the first scene collapses in a shrinking circle, leaving a second scene on the screen.


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