User Manual

Matte Tab
The Matte tab refines the Alpha of the key, combined with any solid and garbage masks
connected to the node. When using the Matte tab, set the viewer to display the Alpha channel
of Primatte’s final output.
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.
Blur Inward
Activating the Blur Inward checkbox generates the blur toward the center of the foreground
subject. Conventional blurring or defocus affects the matte edges in both directions (inward
and outward) and sometimes introduces a halo artifact around the edge in the composite view.
Blur Inward functions only in the inward direction of the foreground subject (toward the center
of the white area). The final result removes small and dark noise in the screen area without
picking them up again in the Clean Background Noise mode. It can sometimes result in softer,
cleaner edges on the foreground objects.
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