Apple Shake 4 Tutorials - Manual (Page 259)

Tutorial 9 Creating Clean Plates 259
Once you have a clean plate, add an Image–FileOut node and render the clean plate as
a new image or image sequence to include in the main composite.
Here you’ve cleaned one frame. You could apply the same techniques to clean an
image sequence or clip. To do so, connect a copy of your original sequence and use it
as the second input for the QuickPaint node; then, use the Time View to offset that
copy in time (Tutorial 2 explains how to use the Time View), and paint from clean
frames to the frames you want to modify.