Apple Shake 4 Tutorials - Manual (Page 217)

Chapter 7 Tracking and Stabilization 217
To adjust the foreground sign position:
1 Go to frame 1.
2 Ensure that the Viewer Autokey button is deactivated (unless you want to animate the
image, which you do not).
3 Click the BG/FG button on the Viewer to show the foreground display.
This displays four corner markers in the Viewer. These points correspond to what is
matched to the four trackers. By default they are located in the four corners of the image.
4 Pull the corners in.
The corners represent the track location points. Therefore, bringing the points in
expands the image size in the composition.
5 Toggle the Viewer to BG mode.
Note: You may need to switch your outputType back to Over. Occasionally this
parameter is not reset properly.