OT: Chroma Key

p@mast3rs wrote on 1/16/2005, 12:28 PM
Is it me or is this just the absolute collest thing ever? The more I use i, the more amazed I get with it. Ive never been to Paris but by my video, you could never tell.

Why dont more editors use green screens? It just seems like so much footage can be shot on one's own and then combined in the studio for the desired location.

This just gave my current project a whole new demention in horror.

One thing though, any way to overcome spills inside Vegas? Sometimes you just cant get a good key as you can see small green outlines of the character even after oversaturating the greens with the Secondary CC.

Any advice?

Comments

taliesin wrote on 1/16/2005, 12:37 PM
I often use the Color Corrector Secondary not to prepare a key but actually to do the keying. Especally if the footage doesn't look that well I prefer the adjustments Color Corrector Secondary gives me for chromakeying. More control even on the edges.
So maybe you might try to use Color Corrector Secondary for the whole keying process. Maybe combine this one with the regular Chroma Key used after the key made with CC Secondary.

Marco
Fleshpainter wrote on 1/16/2005, 8:21 PM
I found that using chroma blur set at 1.000 horizontal/ 0.000 vertical before chroma key helps with the edge. Also, use some whacky color behind the subject first (like magenta) before swapping it out with the background so you can see what you're doing while adjusting your sliders.
Spot|DSE wrote on 1/16/2005, 8:24 PM
Lighting is EVERYTHING, and if you still get spill, using secondary as a mask, and/or using Secondary to pump the key color helps a lot. Chroma blur is wonderful too, and of course, you can always make a garbage matte too. Vegas is very, very good for keying, but it can't be stressed nearly enough, lighting is critical for a good key.
Fleshpainter! Good to see you back around!
Skywatcher wrote on 1/16/2005, 9:14 PM
Did my first Chroma Key last week. IT IS AWESOME! Results with my green screen is amazing! You know how you kinda get burned out then you discover something new...it revitalizes you all over again.

Man! I spent $50 bucks for everything including the lighting! Spectacular results using a standard video camera (no 3ccd or DV).

Skywatcher
logiquem wrote on 1/17/2005, 5:55 AM
In fac,t it is very difficult to acheive something completly satisfaying with chromakeying in professionnals terms (outside of zillion $$$$ movie industry). You may be happy whit the "magic" effect you have got "easily", but obtaining high level artistical results is really tough.

For example, even if you get completly rid of keying artefacts (a thing i'm not sure itis possible with DV), you will have very hard time just trying to make the subject lighting coherent with the background img lighting context. That's one of the secrets of realistic keying.