Masking and Tracking
When a mask is added to an object with applied tracking data, the data is applied to the
mask. In the following image, the foreground object is tracked to four points on the
background clip, but still must be masked to fit into the picture frame.
By masking the image being tracked, you can include only the portion of the image you
want to fit in the frame.
Although the mask is attached to the foreground image, you might need to animate
changes in the mask’s position and scale to accommodate changes in the background
clip over time.
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Chapter 22
Motion Tracking
Note: As an alternative to using masks, you can also crop an object with applied tracking
data using Crop controls in the Properties Inspector.
You can track the control points of a mask to a clip or apply existing tracking data to the
control points of a mask. For more information, see
Track Points Workflow
.