2011

Table Of Contents
Compositing Operators
The following table lists the compositing operators applicable between front
and back input images:
Result:Operator
Composites the front over the back. The output will cover any area covered
by either the front or the back. Where the front and back overlap, the
output will show the front.
Over
Completely replaces the back image with the front image.Replace
Similar to the Over operator, but the output will cover the same area
covered by the back.
Atop
Composites the front over the back, but the output will cover only the
area covered by both front and back.
Inside
The output will be equal to the front except that the part of the front
overlapping the back image will be missing. No part of the back will be
visible in the output in any case.
Outside
The output will be equal to the back except that the part of the back
covered by the front image will be missing. No part of the front will be
Cutout
visible in the output in any case. Basically this operator is equal to the
Outside operator with the front and back roles reversed.
Both front and back are copied to the output except for the part where
they overlap.
Xor
Control Edge
The Control Edge tool lets you move, stretch, and soften the edges of a matte.
You can widen an edge, offset it toward the interior or exterior, and blur its
inner and outer extremities separately.
352 | Chapter 16 2D Compositing