Apple Shake 4 - Manual (Page 791)

Chapter 26 Transformations, Motion Blur, and AutoAlign 791
7 The auto-aligned clean plate can now be used in paint or rotoscoping operations to
remove unwanted rigging from the actor in the mountaineer shot. For example, you
can connect the original Mountaineer image to the first input of a QuickPaint node, and
the output from the AutoAlign node to the second input.
8 With this setup, you can use the Reveal Brush to paint out the rigging against the
backdrop of the clean plate.
Original Image
Reveal Brush exposing auto-aligned image