White background on TV... causing harm? at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > Non-Linear Editing on the PC

Non-Linear Editing on the PC
Discussing the editing of all formats with Matrox, Pinnacle and more.

Thread Tools Search this Thread
Old July 28th, 2005, 12:00 PM   #1
New Boot
Join Date: Jun 2005
Posts: 19
White background on TV... causing harm?

Not sure if this is the appropriate forum for this question, but i'm putting together a tape of a professor's slide show presentation in my NLE program, and i'm wanting to cut between the video of the professor and the actual powerpoint slides (converted to high-res jpegs). The only problem is that all of the slides are black text or images on a pure white background. Will this brighr of a white cause harm to televisions? I know there are such things as "broadcast safe colors" and i plan to apply that filter to the video track, but is a screen of mostly white going to be a bad thing for a TV?
Matthew Lewis is offline   Reply With Quote
Old July 28th, 2005, 05:04 PM   #2
Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
No. The white may not display properly.

Overly bright+saturated colors aren't safe for broadcast because of the way NTSC television transmission works. Anything approaching 133IRE (composite values) will cause the transmission equipment to overheat. It may also bleed into the audio signal and cause noise in it. Anything too low will interfere with sync signals.
Glenn Chan is offline   Reply With Quote
Old July 28th, 2005, 05:16 PM   #3
Major Player
Join Date: Oct 2004
Location: Melbourne, Australia
Posts: 241
I'd just use a brightness/contrast filter to lower the white (while looking at the histogram). Sounds like an instructional video that probably won't go to broadcast, and I'd think most tv's would handle it ok (ie without damage), but equipment considerations aside, black on bright white is hard on the eyes.

There isn't really anything stopping you applying the broadcast safe filter to the track with the slides as well, but I'd go the brightness/contrast filter first.
Kyle Ringin is offline   Reply With Quote
Old August 12th, 2005, 11:16 AM   #4
Major Player
Join Date: Jun 2005
Location: Houston, TX
Posts: 344
Your editing program may call it something like "NTSC filter".

Enable it and it will cut the brightness levels to fit the signal. It would be more accurate to use this feature than just turning down the brightness.
Stephen Finton is offline   Reply

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

(800) 223-2500
New York, NY

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

Texas Media Systems
(512) 440-1400
Austin, TX

Precision Camera
(800) 677-1023
Austin, TX

(800) 323-2325
Mineola, NY

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 > Windows / PC Post Production Solutions > Non-Linear Editing on the PC

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 01:48 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2018 The Digital Video Information Network