Apple Color 1.0 - Manual (Page 308)

308 Chapter 15 Geometry
 Manual Tracker: Click to enter manual tracking mode, where you use the pointer to
click on a feature in the preview area that you want to track. Each click positions the
onscreen tracker control manually to create a tracking keyframe, and then advances
the playhead one frame, until you reach the end of the shot. Using this feature, you
can rapidly hand-track features in shots that automatic tracking can’t resolve.
 Tracking Curve Smoothness: Smooths the tracking data to eliminate uneven or
irregular motion. Higher values smooth the tracked motion path more. You can
smooth both automatic and manual tracking data.
Note: The original motion tracker data is retained and never modified via the
smoothing.
 Process: Once you’ve adjusted the onscreen controls to identify a reference pattern
and search area, click Process to perform the analysis.
 New: Creates a new tracker in the Tracker List.
 Remove: Deletes the currently selected tracker in the Tracker List.
 Mark In: Marks an In point in the current shot at which to begin processing. If you
don’t set an In point, the first frame of the shot is used.
 Mark Out: Marks an Out point in the current shot at which to end processing. If you
don’t set an Out point, the last frame of the shot is used.
Working with the Tracking Tab
This section describes how to do motion tracking.
To automatically track a feature:
1 Move the playhead to the shot you want to track.
2 Open the Tracker tab in the Geometry room, then click New.
A new, unprocessed tracker appears in the Tracker List, and its onscreen controls
appear in the Image Preview area.
3 Move the playhead to the first frame of the range you want to track, and click Mark In.
A green In point appears in a new track in the Timeline.
In many cases, this will be the first frame of the shot. However, if the feature is not
visible or doesn’t start moving until several frames into the shot, you’ll want to set the
In point to the first frame where the feature you want to track is either visible or just
before it starts to move.