5.5

Table Of Contents
1164Motion User Guide
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.
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 also track the control points of a mask to a clip or apply existing tracking data to
the control points of a mask. See Track shapes, masks, and paint strokes in Motion.
Tracking behavior controls
Analyze Motion controls in Motion
The Analyze Motion behavior analyzes and stores tracking data from a video clip or image
sequence but does not transform the tracked footage. Analyze Motion data tracks are
meant to be referenced by the Match Move, Stabilize, Track Parameter, and Track Shape
behaviors. See Analyze motion in a clip.
After you apply an Analyze Motion behavior to a clip, the Behaviors Inspector displays the
following adjustable controls:
Movement: Two controls used for the motion-tracking analysis.
Analyze: A button to activate a motion-tracking analysis. When you click Analyze, a
status window appears and displays the tracking progress. To stop the analysis, click
the Stop button in the status window or press Esc.
The start frame of the track analysis is based on the current playhead position,
rather than the beginning of the behavior bar in the Timeline.
Reverse: A checkbox that, when selected, reverses the analysis direction, going from
the playhead position to the first frame of the clip (or the first frame of the tracking
behavior).
Note: You must move the playhead to the frame where you want the reverse analysis
to begin.
Tracker: An Add button to add onscreen trackers to the Analyze Motion behavior. By
default, one tracker is available. New trackers are added at the center of the canvas.