Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 277

See also
"Creating and importing masks" on page 254
"Matte effects" on page 448
Close a hole in a matte
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
2 Set stage-one controls (the first three properties) to spread the matte as far as possible without altering its shape,
as 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 (the next three properties) to choke the matte by the same amount as that by which you
3
spread it in stage one.
4 (Optional) Use the Iterations property to specify how many times After Effects repeats the spread-and-choke
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 effects" on page 448
AFTER EFFECTS CS3 271
User Guide