Apple Motion 5.1.1 - Manual (Page 895)

Chapter 20 Shapes, masks, and paint strokes 895
Apply filters to masks
As with shapes, you can apply filters to masks, which remain editable even after the application.
It’s 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.
Original mask (color channel) Original mask (alpha channel)
Crystallize filter applied to alpha channel
(color channel view)
Crystallize filter applied to alpha channel
(alpha channel view)
When applying filters to masks, it’s useful to bear in mind that masks are just grayscale images.
In the example above, the Crystallize filter creates patterns in the grayscale mask image, which
results in a rippled translucent pattern.
Apply a filter to a mask
Do one of the following:
m Drag a filter from the Library onto a mask in the Layers list or Timeline.
m Select a mask in the Layers list or Timeline, then choose a filter from the Add Filter pop-up menu
in the toolbar.
The filter appears nested underneath the mask layer to which it’s applied.
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