[David Valbuena]

@taniabondaro This is months late, but for those who are trying to use AE’s native unmult and finding that the colors are not as rich as Maxon’s Universe unmult, here is what worked for me:

To your layer, first add the following effect:

Channel Combiner
From: Max RGB
To: Alpha

And then add the following effect:

Remove Color Matting
Select color: Black

In your effects panel for that layer, it should show Channel Combiner first and then under it should be Remove Color Matting