Apple Shake 4 - Manual (Page 770)

770 Chapter 26 Transformations, Motion Blur, and AutoAlign
Drag the center control to move the point about which scaling is performed, affecting
the xCenter and yCenter parameters.
There is an additional method you can use to scale images in the Viewer.
To scale an image in the Viewer without using the scale handles:
1 Select an image.
2 With the pointer positioned over the Viewer, press E or I.
3 When the dimension pointer appears, drag in the direction you want to scale the image.
The colors in the dimension pointer correspond to the pan controls.
When you drag, the dimension pointer turns into an axis arrow, indicating the
dimension in which you are scaling the image -- horizontal, vertical or diagonal.