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Simple Choker (PB only)
The Simple Choker shrinks or expands the edges of a matte in small increments to create a
clean matte.
A
A. Original matte B. Negative values used to spread borders C. Positive values used to choke
borders
Matte Choker (PB only)
The Matte Choker 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.
The sequence of choking and spreading occurs in two stages, each with its own set of
identical controls. Typically, stage two does the opposite of stage one. After a specified
number of back-and-forth adjustments (which are handled automatically by the Matte
Choker), the hole is filled and the matte shape is preserved.
Undesired transparent and semitransparent pixels (holes) in image (left). Holes filled by Matte
Choker, preserving shape of image (right).
To close a hole in a matte using the Matte Choker:
1 Select the layer and choose Effect > Matte Tools > Matte Choker.
2 Set stage-one controls (the first three sliders) to spread the matte as far as possible
without altering its shape, as follows:
Geometric Softness specifies (in pixels) the largest spread or choke.
•
Choke sets the amount of choke. Negative values spread the matte; positive values
•
choke it.
Gray Level Softness specifies how soft to make the edges of the matte. At 0%, the matte
•
edges contain only fully opaque and fully transparent values. At 100%, the matte edges
have a full range of gray values, but may appear blurred.
3 Set stage-two controls (sliders four, five, and six) to choke the matte by the same
amount you spread it in stage one.
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