Split Color Channels for Mattes

[Todd Kopriva]

Check out the Channel effects.

A simple one for using the color channel values as alpha channel values is the Set Channels effect.

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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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[Chris Wright]

Here’s an example.
https://www.megaupload.com/?d=V6J1HBY2

https://technicolorsoftware.hostzi.com/

[Jason Mckee]

Okay cool. I was doing it right. I just had to be sure. Also the shot I was testing it on wasn’t very ideal since it had no clear difference between the channels. Thanks.