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Animating Masks

You can animate masks either with behaviors or keyframes in the same manner as other objects—that is, you can adjust their various parameters, such as Position, Rotation, Scale, and Feathering so they change over time. You can find detailed descriptions of how to work with behaviors and keyframes in Chapters 6 and 7 respectively. Remember, when you animate a mask, you animate the regions of transparency for the object without animating the object itself.

Just as you can animate the control points of shapes, you can animate the control points of masks to make the shape of the mask change over time. This process is called rotoscoping when you use it to isolate a moving element from its background. A word of warning—even with the advanced BSpline masking tool and the real-time feedback capabilities of Motion, rotoscoping can be tedious, and it is a skill that takes practice to develop. So if you are new to rotoscoping, take your time, and read “Some Rotoscoping Tips” before you start.


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