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Applying filters or behaviors to masks in Motion

You can apply filters and behaviors to masks. Masks remain editable even after the application of a filter or mask.

Filters and masks

Applying a filter to a mask is an extremely powerful way to further manipulate the alpha channel created by a mask. For example, you can apply the Crystallize filter to a mask to add stylized, jagged edges that resemble facets of crystal.

Canvas showing mask with no filters applied
Canvas showing mask with filter applied

When you apply a filter to a mask, it’s useful to bear in mind that a mask is just a grayscale image. In the example above, the Crystallize filter creates patterns in the grayscale mask image, which results in a rippled translucent pattern.

You apply a filter to a mask the same way you apply a filter to any other layer in your project. See Apply or remove filters.

Behaviors and masks

When you apply a behavior to a mask, the mask is animated like any other layer. However, because the mask affects only the transparency in a layer, and not the position, rotation, or scale of the layer, the result is similar to that of a “traveling matte,” where the mask moves in the layer it’s applied to, hiding and showing different areas of the image as it moves.

You apply a behavior to a mask the same way you apply a behavior to any other layer in your project. See Intro to applying behaviors.

Download this guide: PDF

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