Apple Shake 4 - Manual (Page 734)

734 Chapter 25 Image Tracking, Stabilization, and SmoothCam
Use the + and – keys (next to the Delete or Backspace key) to zoom in and out of the
clip. The zoom follows the pointer, so place the pointer on the key point in the Viewer
and zoom in. Press the Home key (near the Page Up and Page Down keys on your
keyboard) or click the Home button in the Viewer shelf to return to normal view.
You can also adjust a tracking curve in the Curve Editor. In the tracking node
parameters, open the trackName subtree and click the Load Curve button to load a
parameter into the Curve Editor. In the following example, track1X (only the X
parameter) is loaded into the Editor.
Averaging Tracks
A common technique is to track forward from the first frame to the last, create a
second track, and track backward from the last frame to the first. These two tracks are
then averaged together to (hopefully) derive a more accurate track. If you plan to use
this method, it is recommended that you use the Tracker node, and then load your
tracks into Stabilize or MatchMove with the Load or Link Track functions (in the
trackName text field shortcut menu).
To average tracks:
1 Apply a Tracker node, and in the bottom of the Tracker parameters, click Add.
2 Click Add again.
There are a total of three trackers.
Note: You could also potentially use tracks from any other Stabilize, MatchMove, or
Tracker node.
3 Create tracks on track1 and track2.
4 Right-click track3, then choose Average Tracks from the shortcut menu.