Adobe 12040118 - After Effects Standard Tutorial page 444

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, 16-bpc, and 32-bpc color.
Original (upper-left) contains unwanted edges after keying (lower-left) that are removed with Simple Choker (lower-right).
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