Grow/Expand a matte?

[I.a. B.]

under the menu for the mask there should be a thing that says “mask expansion”

[Aaron Neitz]

Right on that. But I’m not drawing masks, I’m using a black&white video image as a “track matte: alpha layer”. That’s what I need to grow.

[I.a. B.]

oh sorry, you said mask at one point so that tripped me up.

hmm i’ll have to try some things out. someone will probably think of something better by the time i figure a decent way out.

[Aaron Neitz]

I can kinda get Matte Choker to expand it a little, but it gets awfully noisy.

i just rendered it out in Shake and brought it into AE. But there must be a way to do this otherwise.

[Darby Edelen]

Simple Choker usually works well for choking/expanding something after it has been matted. You can also look at Minimax under the Channel effects to run a minimum/maximum operation on the RGB or Alpha channels.

Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA

[Aaron Neitz]

Thanks, that’s exactly what I was looking for.

[Rafael Folk]

Yes!
It’s working for me too 🙂

Thanks