Roto Brush Matte settings

…Next, I want to refine the edges around this propagation boundary.…And to do that, I think it's best to see the composite in context.…So I'm going to switch back to the composition panel.…And here I have my hands disembodied, floating on top of my new screen.…You see, with no screen in between, this shot looks natural because…I have a copy of the hands on top of the original shot.…It's when the screen gets in between that you see…these mad lines.…

And compositing is all about the mad edges.…What I need to do is clean up those edges.…So that these hands smoothly blend into the screen behind.…I also want to take into account that those hands are some…what out of focus compared to say the shirt and the actors face.…So I want to somewhat feather this edge so the composite…melts, from layer to layer, rather than having a hard dividing edge.…And I see why I have some dark lines,…here, where the original screen was.…Or I could probably stand to go back…and actually clean up my Roto Brush propagation boundary.…

I'm going to see how much I can clean up just by adjusting the matte parameters.…