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Matte Tab
The Matte tab refines the softness, density, and overall fit of the resulting matte.
Filter
This control selects the filtering algorithm used when applying blur to the matte.
– Box: This is the fastest method but at reduced quality. Box is best suited for minimal
amounts of blur.
– Bartlett: Otherwise known as a Pyramid filter, Bartlett makes a good compromise between speed
and quality.
– Multi-box: When selecting this filter, the Num Passes slider appears and lets you control the
quality. At 1 and 2 passes, results are identical to Box and Bartlett, respectively. At 4 passes and
above, results are usually as good as Gaussian, in less time and with no edge “ringing.”
– Gaussian: The Gaussian filter uses a true Gaussian approximation and gives excellent results, but
it is a little slower than the other filters. In some cases, it can produce an extremely slight edge
“ringing” on floating-point pixels.
Blur
Matte Blur blurs the edge of the matte based on the Filter menu setting. A value of zero results in a
sharp, cutout-like hard edge. The higher the value, the more blur applied to the matte.
Clipping Mode
This option determines how edges are handled when performing domain of definition rendering.
This is profoundly important when blurring the matte, which may require samples from portions of the
image outside the current domain.
– Frame: The default option is Frame, which automatically sets the node’s domain of definition
to use the full frame of the image, effectively ignoring the current domain of definition. If the
upstream DoD is smaller than the frame, the remaining area in the frame will be treated as
black/transparent.
– Domain: Setting this option to Domain will respect the upstream domain of definition when
applying the node’s effect. This can have adverse clipping effects in situations where the node
employs a large filter.
– None: Setting this option to None will not perform any source image clipping at all. This means
that any data required to process the node’s effect that would normally be outside the upstream
DoD will be treated as black/transparent.
Contract/Expand
This slider shrinks or grows the semitransparent areas of the matte. Values above 0.0 expand the
matte, while values below 0.0 contract it.
This control is usually used in conjunction with the Matte Blur to take the hard edge of a matte and
reduce fringing. Since this control affects only semitransparent areas, it will have no effect on a matte’s
hard edge.
Gamma
Matte Gamma raises or lowers the values of the matte in the semitransparent areas. Higher values
cause the gray areas to become more opaque, and lower values cause the gray areas to become
more transparent. Completely black or white regions of the matte remain unaffected.
Since this control affects only semitransparent areas, it will have no effect on a matte’s hard edge.
Chapter 107Matte Nodes 2072
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