Copy a rotobrush to a mask
I’ll explain what I’m trying to do, in case the problem is in my process:
I want a person to become translucent. For that, I’ve got a clip for the background with and without that person over it. I create two layers, one with the person over the one with the background. I rotobrush the person.
Then, I want to create, with that rotobrush selection, a layer that’s just white inside the selection and black outside, to use that layer as a reference for a displacement effect over the background layer. And here I find my problems:
– How to change the layer to white over black/transparent? I’ve done that by touching brightness contrast. Is there a faster/better way?
– How to turn that "white over alpha" layer into a grey degradation from the outside to a white center?
– How to tell AE that I want that layer to be the reference for a displacement (or any other effect, for that matter) on the background layer?
via Video Editing Forums: Digital Director – Adobe Premiere, Premiere Elements, and After Effects http://www.videoforums.co.uk/adobe-premiere-premiere-elements-after-effects/43463-copy-rotobrush-mask.html