Apple Shake 4 - Manual (Page 617)

Chapter 23 Color Correction 617
The following screenshot shows a correctly set up node tree. Mult, Gamma, and
ContrastRGB nodes are inserted between a pair of MDiv and MMult nodes, prior to
compositing the two images with a layering node (the Over node).
Note: In the above example, all three color-correction nodes concatenate properly,
shown by the green line that is visible with enhanced Node View is on.
For a more detailed description of premultiplication and its importance in compositing,
see “
About Premultiplication and Compositing ” on page 421.
Color Correction and the Infinite Workspace
The Shake engine applies effects to a potentially infinite canvas, so occasionally you may
encounter an unexpected result when you color correct and pan a small element across
a larger element. This occurs when an Invert, Set, or Add node is applied to an image,
since the previously black pixels outside of the frame are changed to a different color.