Matte Problems

Matte Problems

There are specifi c tools to help you manipulate transparency
once a matte exists.
Minimax is powerful but imprecise, operating as it does
in whole pixel increments. It provides a quick way to
spread or choke pixel data, even without alpha channel
information (it can also operate on individual channels of
luminance).
Simple Choker allows you to choke or spread alpha channel
data (via a positive or negative number, respectively)
at the sub-pixel level (in other words, use decimal values).
That’s all it does. You can push it hard and even use more
than one instance if the 100 pixel limit gets in your way, as
it can with garbage mattes.

Matte Choker looks and even sounds more deluxe than
Simple Choker (something about that that “Simple” label)
but it merely adds softness controls that can just complicate
a bad key. I use Simple Choker most of the time, and I
don’t feel like a simpleton for doing so.