Apple Shake 4 - Manual (Page 455)

Chapter 16 Compositing With Layer Nodes 455
Note: Because the curves can dramatically alter opacity of the foreground, you may
need to ensure that the interior of the matte is 100-percent opaque through the use of
additional masking, garbage mattes, and so on.
Parameters
This node displays the following controls in the Parameters tab:
clipMode
Toggles between the foreground (0) or the background (1) image to set the output
resolution.
preMultiplied
Set this parameter to Yes if the foreground is premultiplied. This is the opposite of the
standard Over. If enabled, the foreground curve does nothing.
foreground curve
A graphical control appearing within a curve editor in the Parameters tab. This curve
controls the way the edge of the foreground image is blended.
Default curves
Modified curves