To Close A Hole In A Matte (Pro Only) - Adobe AFTER EFFECTS 7.0 Manual

"Matte Choker effect (Pro only)" on page 466
"Simple Choker effect (Pro only)" on page 467

To close a hole in a matte (Pro only)

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 Matte Choker), the hole is filled and the matte shape is preserved.
Select the layer, and choose Effect > Matte > Matte Choker.
1
Set stage-one controls (the first three sliders) to spread the matte as far as possible without altering its shape, as
2
follows:
Specifies (in pixels) the largest spread or choke.
Geometric Softness
Sets the amount of choke. Negative values spread the matte; positive values choke it.
Choke
Specifies how soft to make the edges of the matte. At 0%, the matte edges contain only fully
Gray Level Softness
opaque and fully transparent values. At 100%, the matte edges have a full range of gray values but may appear
blurred.
Set stage-two controls (sliders four, five, and six) to choke the matte by the same amount you spread it in stage one.
3
(Optional) Use the Iterations slider to specify how many times After Effects repeats the spread-and-choke
4
sequence. You may need to try a few different settings so that the sequence is repeated as many times as necessary to
close any unwanted holes.
See also
"Matte Choker effect (Pro only)" on page 466
ADOBE AFTER EFFECTS 7.0 282
User Guide