2011

Table Of Contents
To:Select:
Place the RGBA of input A over the RGBA of input B but through the alpha
of input B.
A atop B
Place the RGBA of input B over the RGBA of input A but through the alpha
of input A.
B atop A
Create the union of the RGBA of inputs A and B minus the intersection of
the RGBA of inputs A and B.
A xor B
NOTE The Comp Ops tool has a masking input and its attributes are also
animatablesee
Pixel Masking on page 560 and Animation Concepts on page 660.
Math Ops
The Math Ops tool lets you apply mathematical blending operations to the
RGBA values of two source images.
Use the following procedure to apply mathematical blending operations.
To apply mathematical blending operations to an image:
1 Drag the Math Ops tool from the Tools tab to the dependency graph in
the Schematic view.
2 Connect a source image to input A and another source image into input
B of the Math Ops node.
370 | Chapter 16 2D Compositing