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greenscreen question

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greenscreen question
by matthew chung (mc 1) on May 12, 2008 at 8:15:57 pm

so i was watching the behind the scenes of Cloverfield and saw the greenscreen they used had positioned black markers.

are those used for motion tracking? just curious. thanks.

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Re: greenscreen question
by Dave LaRonde on May 12, 2008 at 8:47:56 pm

Yes, that's why thery're there.

However, I bet there were other things in that video that were much more fundamental and FAR MORE IMPORTANT to a successful green screen to note:

• The size of the green screen
• The distance of the green screen from the subject
• If you saw the green screen all lit up, the uniformity of the lighting on the green screen, and how many lighting instruments it took to do the job properly

And one thing you didn't see: the rotoscope artist who has to has to remove those little black dots FRAME BY FRAME when they intersect with the subject(s) in the foreground.

If you ignore that stuff, then all the motion tracking tricks in the world aren't going to save your green screen shot.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

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Re: greenscreen question
by matthew chung on May 12, 2008 at 9:01:02 pm

Hey Dave,

yes, i was going to ask about the roto work to take those black tracker things out. ouch. and yes, thanks for other notes. i have learned the hard way of the importance of even lighting, distance of the screen from the talent, and size of the screen.



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Re: greenscreen question
by Dave LaRonde on May 12, 2008 at 9:50:17 pm

[matthew chung] "i have learned the hard way....."

Ah, but such lessons are the longest-lasting.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

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