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80 Chapter 2 Motion Tracking
2 In the Behaviors tab of the Inspector, Control-click the Center parameter, then choose
Track from the shortcut menu.
In the Canvas, the filter’s onscreen control is replaced with a tracker. The Behaviors tab
becomes active and the Track behavior parameters are displayed.
Note: In the Filters tab, a behavior icon appears next to the Center parameter,
indicating that it is influenced by a behavior.
If necessary, adjust the tracker in the Canvas. If the reference pattern you want to track
is offset from the center of the filter, use the Offset Track checkbox. For more
information on using the Offset Track parameter, see “Tracking Obscured or Off-Frame
Points” on page 91.
3 Click the Analyze button in the HUD or Behaviors tab of the Inspector.
The filter’s center is tracked to the clip.
Note: You can make changes to the filter parameters after the analysis is performed.
Adjusting the Onscreen Trackers
The Analyze Motion, Stabilize, and Match Move behaviors share common onscreen and
interface controls.
A tracker consists of a single onscreen control: the tracker.
The default onscreen tracker color is yellow. Depending on the color of your subject,
you may need to change the color of the tracker to see the tracker in the Canvas.
Once the tracking analysis begins, a progress window opens and track points appear in
the Canvas. The track points are the post-analysis motion path (the path that looks like
a string of pearls) that appears in the Canvas. The track point at the current playhead
position is emphasized.