Comments

BillyBoy wrote on 1/13/2003, 2:53 PM
Chroma keying is only effective if you're removing something that is a solid or near solid color. In other words if the background you want to remove is mostly one shade of red you can get fairly decent results, if not, no because only the red would be removed. Worse if any part of the subject you want to keep also has shades of red, that will get removed as well.

You could try the cookie cutter filter if you can live with a circle, square, etc.. surrounding what you want to keep and in effect blocking out everything else.

Now if your project isn't too long (maybe a couple minutes or less) and you have a lot of time, you could export frame by frame (several utility programs easily do this), then one image at a time remove the objectionable background, replacing it withsomething else or mask it out on a alpha channel.

Give us more an idea what you're trying to do.

VideoDentist wrote on 1/13/2003, 3:04 PM


I would like to create special effects of making it aqppear a person is flying etc. through a scene then maybe swirl out and re- appear Is this not the program for that. If not what is?
Appreciate the help.
BillyBoy wrote on 1/13/2003, 3:20 PM
Something along the lines of Superman? Those kind of special effects are filmed in front of a blue screen (actually it usually is green in color) then the 'green' gets chromakeyed out, then whatever background you want replaces it so it looks like the man of steel is flying over building etc.. No reason you can't try to duplicate the method when video taping. Trying to do it post production is far more demanding.

As far as I know there is no easy way if you're attempting to fix footage already shot. The big problem will be masking a irregular shaped object. Like if you want some person to fly through your scene his arms, legs, hands, etc.. with be in a slightly different position making it very difficult to block out background you don't want to see unless you go the frame by frame route. Nope, Vegas doesn't support doing stuff like that. The cookie cutter is about as close as it comes and for what you want it wouldn't work that well.

There are other application... expensive (very) where you can paint out the background called retroscoping if I remember correctly. Again, very teasous to do.

VideoDentist wrote on 1/13/2003, 3:45 PM


Thanks. Just looking at the limits of VV3
CraigF wrote on 1/13/2003, 4:14 PM
This really isn't a limit of VV3, more of a limit of NLE in general. As it was already mentioned, VV3 can do what you are looking at IF you film the subject in front of a green screen. Then you overlay that video on the background of your choice.

Craig