Matte Effects - Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual

From the Color Accuracy menu, choose Faster to suppress blue, green, or red. Choose Better to suppress other
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colors, because After Effects may need to analyze the colors more carefully to produce accurate transparency. The
Better option may increase rendering time.
Drag the Suppression slider until the color is adequately suppressed.
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Matte effects

Matte Choker effect
The Matte Choker effect repeats a sequence of choking and spreading the matte to fill undesired holes (transparent
areas) in opaque regions. The repetition is necessary because the entire matte must be choked and spread; the
spreading fills the hole, but the edges of the matte must be choked back to preserve the matte shape.
This effect works with 8-bpc and 16-bpc color.
Original (top left) shows areas of unwanted transparency after using Color Key (bottom left) that are removed with Matte Choker (bottom
right).
See also
"Keying overview" on page 268
"Close a hole in a matte" on page 271
Simple Choker effect
The Simple Choker effect shrinks or expands the edges of a matte in small increments to create a cleaner matte. The
Final Output view displays the image with the effect applied, and the Matte view provides a black-and-white view of
the image with black areas indicating transparency and white areas indicating opacity. Choke Matte sets the amount
of choke. Negative values spread the matte; positive values choke it.
This effect works with 8-bpc and 16-bpc color.
AFTER EFFECTS CS3 448
User Guide