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Here's a Rotobrush tutorial on AdobeTV.
But it sounds a little like you're working the opposite workflow to usual. Typically you would use roto tools like masks and Rotobrush to isolate the foreground of your footage, then use another layer to create a background.
I think I just got a bit wordy there. I am definitely selecting the foreground (or image I want to remain in the footage) with the rotobrush and applying a seperate background later as another layer. The video was very helpful. I am assuming that I have to allow the movement to continue frame-by-frame for the keyframes to take effect and make changes to my roto selections as they fluctuate in time?? I'm going to experiment a bit tomorrow and visit the boards again later. Further clarification is welcome! Thanks Andrew!
I'm going to experiment a bit tomorrow...
I don't know if I'd do that. I'd watch the training materials Andrew recommended instead. The quirks of Rotobrush don't allow for intuitive use. You may end up wasting time.
Very well put. I came up with a fix that looked pretty good. My original footage was of a speaker in front of a white board. I added a spotlight extraction that focused on the speaker and it worked just fine. It was a nice touch. There was a lightswitch on the wall that I wanted to get rid of so I simply put the guy's logo in the corner, covered the switch, and put a nice pulsing glow and haze around the logo. The rotobrush tool is tedious and required an immense amount of time for a 7 min. video. Thanks for all your help. I'll experiment more with rotobrush down the line when I have nothing but time on my hands (or if I'm getting paid)!