5

The start of the track is based on the current playhead position, rather than the start of
the behavior in the Timeline.
Reverse: Click the Reverse checkbox to analyze the clip in reverse, from the current
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 to begin the reverse
analysis.
Tracker Preview: Use this preview area to see a magnified view of the tracking reference
area for the selected tracker. The preview updates as you adjust the position of the tracker
in the Canvas. You can also drag in the preview area to adjust the position of the tracker.
When dragging in the preview area, the image moves around the red crosshairs in the
preview and the tracker moves in the Canvas.
Offset Track: If a tracker’s reference point becomes temporarily hidden or goes off the
screen, use this parameter to select a different reference point that continues the same
tracking path as the original reference point. For more information on offset tracking, see
Tracking Obscured or Off-Frame Points Using Offset Tracking.
Auto-Zoom: Choose an option from this pop-up menu to set the magnification level
when positioning the tracker in the Canvas. This allows you to zoom in on the Canvas
when searching for an ideal tracking reference pattern. There are four choices: None, 2x,
4x, and 8x.
Auto-Zoom Mode: Choose an option from this pop-up menu to set the display of the
auto-zoomed tracker in the Canvas. There are three choices:
• Normal: Displays a normal pattern.
• Contrast: Displays the tracker pattern with contrast detection.
• Edge: Displays the tracker pattern with edge detection.
The Auto-Zoom Mode applies to trackers in the Canvas and does not appear in the
Tracker Preview in the Behaviors Inspector.
Note: When None is chosen from the Auto-Zoom pop-up menu, the Auto-Zoom Mode
setting has no effect.
Look Ahead Frames: Use this slider and value slider to specify the number of “future”
frames to be analyzed by the tracker. In other words, you can direct the tracker to look
in a specific location for its reference point. This is useful for footage that contains
fast-moving objects, because the reference point can quickly get away from the tracker.
For more information on using Look Ahead Frames, see Giving Motion a Hint by Looking
Ahead.
Track list: Use this list to see the trackers in the behavior.
To disable a tracker, deselect its checkbox. A tracker that is turned off is not analyzed with
the track.
When another track is referenced, the track list is replaced with a Tracker pop-up menu.
1360 Chapter 22 Motion Tracking