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Setting and animating mask properties


    Masks are paths that you draw or import into a Composition or Layer window to create transparent areas for a layer. In the Timeline window, you can set mask shape, mask feather, mask opacity, and mask expansion properties and change these properties over time. You can also set interactions between different masks within a layer and set the type of interaction used between the mask and the layer itself. For information on setting mask properties, see the corresponding section for the property you want to set. For example, to set the Mask Opacity property, see Adjusting the opacity of a mask. For information on animating mask properties, see Animating a mask.