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HPX2700 Green Screen Shoot

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Max Wilson
HPX2700 Green Screen Shoot
on Feb 5, 2010 at 1:00:30 am

Hi all,

I have a shoot coming up where we will probably be using the 2700 for green screen work. I am curious what gamma setting is recommended for green screen. As a post guy I am interested in the "Film-REC" setting, but I wasn't sure if it has any advantages over the other settings when it comes to green screen. This will be going to broadcast, but with work in after effects for compositing and grading, so the extra latitude would be nice.

Any advice would be helpful.


Thanks!


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Paul Brubacher
Re: HPX2700 Green Screen Shoot
on Feb 5, 2010 at 2:48:01 am

I just did a shoot with the HPX2000. I loaded in the "Vivid" scene file and was able to pull a very nice (quick) key in Avid using spectra-matte. I don't recall what the gamma was set at.



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John Fishback
Re: HPX2700 Green Screen Shoot
on Feb 14, 2010 at 6:01:04 pm

Lighting the green screen properly is the secret to an easy key. Shooting progressive is better and interlaced. IMHO gamma is irrelevant. If your foreground looks the way you want and the green screen is well lit, you'll be fine.

John

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john sharaf
Re: HPX2700 Green Screen Shoot
on Feb 14, 2010 at 6:11:03 pm

When shooting green screen, in addition to advice about lighting, turning detail off to avoid overly enhanced edges is normal. Also refrain from using gain to minimize noise, but that should be obvious. There is often conflicting advice about video levels, I prefer lighting the green one stop under the key, this helps eliminate green spill and is no problem for the keyer especially if evenness is good.
"Vivid" setting strikes me as not a good idea, as is implies to me a strong matrix. I often turn matrix off too for green screen because the screen itself has so much color there's no need to increase saturation. Best advice, as with all effects, is to test out through your entire workflow. It's almost always cheaper to do this than re-shoot.

JS





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