Using a 50" Plasma TV as a green screen? at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Photon Management

Photon Management
Shine an ever-loving light on you.


Reply
 
Thread Tools Search this Thread
Old February 3rd, 2007, 03:35 PM   #1
Major Player
 
Join Date: Mar 2006
Location: San Francisco, California
Posts: 487
Using a 50" Plasma TV as a green screen?

I've noticed that the topic of lighting a green screen has come up often on here. Is it possible that if you display a green on the plasma television, which has even lighting, and put your subjects in front of it, I could get a really clean key? Besides the fact that you wouldn't have much room to work with, does anybody think it would work? Has anyone tried it?
Chris Harris is offline   Reply With Quote
Old February 3rd, 2007, 04:02 PM   #2
Wrangler
 
Join Date: Dec 2002
Location: Mays Landing, NJ
Posts: 11,542
Instead of green, why not just show the actual background on the plasma screen? I did this for a little project using a model helicopter and it looked surprisingly good!
Boyd Ostroff is offline   Reply With Quote
Old February 3rd, 2007, 05:38 PM   #3
Major Player
 
Join Date: Sep 2006
Location: London UK
Posts: 376
Quote:
Originally Posted by Chris Harris
I've noticed that the topic of lighting a green screen has come up often on here. Is it possible that if you display a green on the plasma television, which has even lighting, and put your subjects in front of it, I could get a really clean key? Besides the fact that you wouldn't have much room to work with, does anybody think it would work? Has anyone tried it?

I actually did this with an Apple 23" Cinema display, I made a photoshop file up with R: 0 - G: 255 - B: 0 and zoomed in so it filled the screen.

It worked very well. :)
Lee Wilson is offline   Reply With Quote
Old February 3rd, 2007, 05:45 PM   #4
Trustee
 
Join Date: Jan 2004
Location: Scottsdale, AZ 85260
Posts: 1,538
You'll be kinda limited to a head and shoulders shot - or if you turn it vertical - an upper torso shot with little arm movement capability...

So size is kinda an issue - particularly if you want some space between your subject and the screen to avoid spill. (A glowing array of light emitters will probably generate more spill than a typical subtractive lit surface - but that's probably not an serious problem.

And, of course you're using a multi-thousand dollar gizmo to do what you can do with a $50 roll of seamless and a few hundred dollars in lights...

But I can't see any reason it shouldn't work.

Let us know how it works out. I'd be interested.
Bill Davis is offline   Reply With Quote
Old February 3rd, 2007, 07:25 PM   #5
Major Player
 
Join Date: Nov 2005
Location: Croydon, England
Posts: 277
Would a good quality video projector and screen be suitable for this sort of thing?
Paul Jefferies is offline   Reply With Quote
Old February 4th, 2007, 09:11 AM   #6
Major Player
 
Join Date: Jun 2006
Location: Shenzhen, China
Posts: 781
Quote:
Originally Posted by Paul Jefferies
Would a good quality video projector and screen be suitable for this sort of thing?
Yes but rear projection would probably be more suitable than front projection is my guess--less spill that way.

Once upon a time there was a backlit blue screen used for the movie "DragonSlayer". It was huge and they lit it from behind with blue colored fluorescent tubes. The ballasts were operated off of DC voltage to reduce the flicker (electronic ballasts either didn't exist in early 80's or were very uncommon). The resulting keys or mattes they got were really great looking.
__________________
Richard Andrewski - Cool Lights USA - RED #114
http://www.coollights.biz
Richard Andrewski is offline   Reply With Quote
Old February 5th, 2007, 10:59 PM   #7
DVi Contributor
 
Join Date: Mar 2006
Location: Austin Texas
Posts: 374
wouldn't you get really bad glare from the glass screen? also this plasma screen may be too bright. you only want about 1 stop over what your subject is at.
Craig Chartier is offline   Reply With Quote
Old February 6th, 2007, 02:59 AM   #8
Inner Circle
 
Join Date: Apr 2003
Location: Aus
Posts: 3,884
Quote:
Originally Posted by Boyd Ostroff
Instead of green, why not just show the actual background on the plasma screen? I did this for a little project using a model helicopter and it looked surprisingly good!
hehehe my thoughts exactly..
Peter Jefferson is offline   Reply With Quote
Old February 6th, 2007, 03:02 AM   #9
Inner Circle
 
Join Date: Apr 2003
Location: Aus
Posts: 3,884
Quote:
Originally Posted by Paul Jefferies
Would a good quality video projector and screen be suitable for this sort of thing?
Yes, i do this quite often with rear projection (i have a Panasonic AE700) and have the talent in front of the screen while the projector is behind it. The good thing is that you can find 2way screens which work a treat and u can always mess with the focus to fake a decent DoF
Peter Jefferson is offline   Reply With Quote
Old February 6th, 2007, 10:32 AM   #10
Major Player
 
Join Date: Sep 2006
Location: London UK
Posts: 376
Quote:
Originally Posted by Craig Chartier
wouldn't you get really bad glare from the glass screen?
My LCD screen is glare free.

Quote:
Originally Posted by Craig Chartier
also this plasma screen may be too bright. you only want about 1 stop over what your subject is at.
You can adjust the brightness on monitors and TVs.
Lee Wilson is offline   Reply With Quote
Old February 7th, 2007, 10:27 AM   #11
Regular Crew
 
Join Date: Feb 2005
Location: Dallas, TX
Posts: 108
I recently did some stills at a client's video shoot (hi def shoot for an infomercial). Half of the commercial had talent in front of a large plasma screen, since the client's big claim is using broadcast TV to sell houses. They just had a bright green frame on the screen, and back lit the talent warm to supress spill... and the talent was close, maybe 12-24" in front of the screen.

The keys looked good on DVD when they dropped the content onto the screen; I even pulled an easy key (from my Nikon D70 shots) in Photoshop for their brochure. So, in my experience, yes it works, but seems most useful for miniature work or for, say, computer screen readouts in a scene.
Michael Carter is offline   Reply With Quote
Old February 11th, 2007, 10:48 PM   #12
Major Player
 
Join Date: Nov 2003
Location: ontario
Posts: 445
I have used a rear projection Mits TV with the "no input" blue screen on an intro.The screen is quite matte and not shiny at all.Just light the subject right.
Jack Smith is offline   Reply With Quote
Old February 12th, 2007, 10:11 PM   #13
Great DV dot com
 
Join Date: Sep 2003
Location: Lewisville, NC
Posts: 78
Wow, guys, this is way overkill for very little benefit. It's not that hard to evenly light a BG the size of a 50" tv (even much larger) and really there is not much benefit. Either way you will be limited more by the format if shooting DV, the plasma won't help that at all.

As to projectors, one DP I know has had pretty good results using a small digital projector on a screen (not even rear projected) for doing faked-up car shots, they look quite good -- and much faster/easier than green screen.
__________________
John Jackman
www.johnjackman.com
John Jackman is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Photon Management

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 06:59 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network