2011

Table Of Contents
To:Use:
Specify how the two input mattes are correlated. This can be used to
improve the quality of the composite in special cases. For example, if
Correlation
you composite two mattes that share a good portion of their outline,
you should let the system know if they are Adjacent or Superposed. By
default, the correlation mode is None, assuming that, normally, the input
mattes are not correlated.
The blend mode is applied to every pixel in the image and the alpha
channels are completely ignored. The output alpha is simply a copy of
the alpha of the back input. By default, this option is false.
Ignore Alpha
Resets the Gain settings to default values.Reset
NOTE The Blend and Comp tool also has a Blend Curves tabsee Blending Curves
on page 347.
Blend Matte
The Blend Matte tool lets you mix two images using a matte image to define
the areas of visibility between the front and back images.
To blend two images using a matte:
1 Drag a Blend Matte tool from the Composition folder in the Tools tab to
the dependency graph in the Schematic view.
2 Connect the front, back and matte images to the tool.
3 Select the Blend Matte Channel: Alpha, Red, Green, Blue, or Luma, as
appropriate for the image you are using as the matte. The default choice
is Alpha.
Select Invert if you want to invert the result.
4 Select the tool output: Composite, Front, or Front and Matte.
368 | Chapter 16 2D Compositing