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Primatte viewer buttons
If the foreground image has a shadow in it that you want to keep in the composite, do not select
any of the dark screen pixels in the shadow. This keeps the shadow with the rest of the
foreground image.
Clean Background Noise
If there are any white or light gray regions in the dark screen area, this is referred to as “noise.”
Technically, it is varying shades of the screen color that did not get picked up on the first sample and
should be removed. You remove background noise using the Clean Background Noise button.
1 From the View Mode menu in the Inspector, select Black.
2 Above the viewer, click the Alpha Channel/RGB button.
The image displayed changes to a black and white “matte” view of the image.
3 Click the Clean Background Noise button.
4 Drag the mouse pointer through these white or light gray regions that should be pure black.
Primatte processes the selection and eliminates the noise.
5 Repeat this procedure as often as necessary to clear the noise from the background areas.
Selecting Gain/Gamma from the viewer’s Options menu to increase the brightness or gamma
allows you to see noise that would otherwise be invisible.
Primatte viewer Options menu
You do not need to remove every single white pixel to get good results. Most pixels displayed as a
dark color close to black in a key image are considered transparent and virtually allow the
background to be the final output in that area. Consequently, there is no need to eliminate all
noise in the screen portions of the image. In particular, if an attempt is made to remove noise
around the foreground subject meticulously, a smooth composite image is often difficult
to generate.
TIP: When clearing noise from around loose, flying hair or any background/foreground
transitional area, be careful not to select any of the areas near the edge of the hair. Leave
a little noise around the hair as this can be cleaned up later using the Fine Tuning tools.
Chapter 107Matte Nodes 2108
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