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68 Chapter 2 Motion Tracking
2 Using the onscreen transform controls or the Properties tab of the Inspector, adjust the
foreground element’s scale, position, or rotation to its “frame.”
3 Go to the frame where you want to start the track and apply the Match Move behavior
to the transformed element.
4 Choose Four Corners from the Type pop-up menu in the Behaviors tab of the Inspector.
5 Do one of the following:
 To adjust the trackers without affecting the foreground image, choose Mimic Source
from the Transform pop-up menu, then position the trackers on the reference
patterns (in this example, the four inside corners of the picture frame).
 To adjust the trackers and affect the foreground image, choose Attach to Source from
the Transform pop-up menu, then position the trackers on the reference patterns.
6 Click the Analyze button in the HUD or Behaviors tab of the Inspector.
The foreground element is “pinned” on the background element. Because this workflow
may not yield ideal results (the foreground element may not scale or move correctly
with the background image, for example), you may need to apply a mask to or crop the
foreground image.