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View Full Version : Need some Keying advice...

vinnydakid
02-27-2006, 02:18 AM
Hello, everyone!
I'm having some real tough pronlems with my project and could REALLY use some advice. I shot a short film almost entirely on a green screen. The screen was lit properly and I had the actors at least ten feet from the screen at all times so that worked out fine. Problem is, two of the actors had long frizzy hair. I've been using the Diamond keyer to key out the green and Matte Conrols to blur the matte a bit .... but the when I render out the clips, there's a huge flickering problem around the hair. Anybody have any advice to key these clips out properly? It's really killing me.

Should I be using the Discreet Keyer instead of the Diamond Keyer? Is that any better at handling fine detail like hair?

Thanks in advance for your advice!
thatoneguy
02-27-2006, 08:38 AM
I'm just going to operate on the assumption that you used DV to film all this.

The answer is. No. If you have the time, and you need the footage to be clean, you'll probably be rotoscoping. I hate to bring up the R word, but hair+DV = #$@#%#@#$'ed up keys.

Some things to try before you resort to gnashing of teeth and Bsplines:

In this order:
A difference Key on the head.
A luminance Key on the head.
Mashing away on the discreet keyer/diamond keyer.

Also a few things to look into: The DV toolkit has a keyer specifically designed to extract clean keys from DV, never tried it, but I hear it's pretty good. But it's at its heart a difference key.
neogeo51
02-27-2006, 09:27 AM
If you shot your footage on DV, it also reduces flickering if you capture it with a videocard via component or Y/C.
beaker
02-27-2006, 04:59 PM
To solve some of the issues with DV.

Convert from RGB to YUV, Blur the U, Convert back to RGB.
vinnydakid
02-27-2006, 07:59 PM
Thanks for the advice guys! I can't wait to get home and try it out. Incidentally..... I didn't shoot DV. I shot it with an HDV cam (720X1280 Progressive Scan). But I'm guessing that your advice still applies!
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