To Create And Adjust The Motion Path For A Feature Region (Pro Only) - Adobe AFTER EFFECTS 7.0 Manual

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Creates a track point for the motion source in the Layer panel for the motion source.
In the Tracker Controls panel, select Position or Rotation as appropriate. If you select Rotation, After Effects adds
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an additional track point, connected by a line, in the Layer panel.
In the Layer panel, specify the work area you want to track. The position and rotation in subsequent frames are
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adjusted relative to the first frame.
Using the Selection tool, position and size the feature and search regions.
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Note: The search region needs to be only big enough to accommodate the frame-to-frame position change of the feature.
6 In the Tracker Controls panel, click the Forward Analyze button to begin tracking.
If the feature region (or regions) drifts away from the feature you want to track, adjust the size and position of the
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feature and search regions as described in "Correcting a drifting feature region (Pro only)" on page 346.
When you are satisfied with the location of the feature region(s) throughout the footage, click Apply. After Effects
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creates anchor point keyframes for the footage.
If the image creeps in from the margins of the action-safe zone, increase the scale just enough to extend past the
margins. Find the frame that creeps in the most, and then nudge the scale (in the Composition panel) using the Alt
+ [plus sign] and Alt + [minus sign] keys on the numeric keypad (Windows), or the Option + [plus sign] and Option +
[minus sign] keys on the numeric keypad (Mac OS). This technique adjusts the scale for the duration of the footage.
See also
"To set a work area" on page 121
"To view and use safe zones and grids" on page 142

To create and adjust the motion path for a feature region (Pro only)

After setting up a track point, you use the Analyze controls in the Tracker Controls panel to begin tracking motion
in a layer. The Analyze controls let you track forward or backward from just one frame to the next or through an
entire sequence of frames. After Effects displays the feature region's motion path by marking an X in the Layer panel
at the center of the feature region at each keyframe. You can then fine-tune the motion path's keyframes and also the
track point.
Motion source and its motion path
A. Moving the feature and search regions B. Keyframe marker
1 Set up a track point.
Track the motion of the feature region.
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A
B
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