Shooting a juggler against a greenscreen at DVinfo.net

Kevin Crockett · January 31st, 2007, 10:25 PM

I'll be shooting a juggler against a green screen. Will the motion of the balls present a problem during the chroma key?

David Delaney · January 31st, 2007, 11:22 PM

yes and no. Interlaced DV video is tough for chroma keying, but not impossible. I can be done, sure but the results are going to be hit and miss. Stay as far away from the Greenscreen as possible (8 feet is usually good) so there isn't as much green spill on the actor. What is your shutter speed? Are you going for a blur or a high shutter speed as in Saving Private Ryan without much blur?

Glenn Chan · February 1st, 2007, 06:54 PM

The motion of the balls can present a problem for you because of the motion blur. Where there's motion blur, your video signal will have a mix of foreground + background and it's difficult to tell the exact combination.

One solution is to use a very fast shutter speed to reduce motion blur. You'll need a lot of light!

January 31st, 2007, 10:25 PM	#1
Kevin Crockett Regular Crew Join Date: May 2004 Location: FL. Posts: 71	Shooting a juggler against a greenscreen I'll be shooting a juggler against a green screen. Will the motion of the balls present a problem during the chroma key?

January 31st, 2007, 11:22 PM	#2
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	yes and no. Interlaced DV video is tough for chroma keying, but not impossible. I can be done, sure but the results are going to be hit and miss. Stay as far away from the Greenscreen as possible (8 feet is usually good) so there isn't as much green spill on the actor. What is your shutter speed? Are you going for a blur or a high shutter speed as in Saving Private Ryan without much blur?

February 1st, 2007, 06:54 PM	#3
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	The motion of the balls can present a problem for you because of the motion blur. Where there's motion blur, your video signal will have a mix of foreground + background and it's difficult to tell the exact combination. One solution is to use a very fast shutter speed to reduce motion blur. You'll need a lot of light!