Can Vegas create a mask this way?

Videot wrote on 8/19/2004, 4:33 PM

I have heard that some programs can create a mask by selecting the difference between 2 versions of the same scene. It seems like the thing you see on TV all of the time where a fixed camera films the scene both with & without some object in it then you fade one scene into another giving the impression that the object either appeared or dissapeared. If Vegas can do this would the results be better or worse than using Chroma Key to create a mask?

Comments

bStro wrote on 8/19/2004, 4:48 PM

Vegas does do masks, but you don't need one for what you describe. Just put the clip with the object on one track and put the clip without the object on a track below it. Then you use an opacity envelope on the upper clip to fade it in and out as you see fit.

As long as your camera position is fixed, and your lighting is even, this is much simpler than using a mask.

Rob

Videot wrote on 8/19/2004, 4:58 PM

I'm aware of that. I guess that I didn't explain myself sufficiently. What I was wondering was once the differance has been calculated & isolated adding that image to a third background.

bStro wrote on 8/20/2004, 8:42 AM

Then I guess that's what you should've asked. ;-)

See the link that johnmeyer posted in this thread for some ideas. It uses masking to make the same cat appear in two places at once.

Rob