Why do I see color bandings? at DVinfo.net

Norris Combs · January 10th, 2011, 12:17 PM

I was recording a short clip of a TV program, by just holding the camcorder in front of the TV. Upon playback, I see color bandings on the camcorder's LCD screen. I haven't transferred the footage to my computer yet, so I'm not sure if the color bandings are only seen on the camcorder's screen, or was it actually recorded and will also be seen on my computer monitor. What causes the bandings? What can be done to prevent them? Thanks!

Camcorder: Canon HFS100
TV: Mitsubishi WD-73738 DLP

Chris Medico · January 10th, 2011, 12:38 PM

If you can post a screen grab of the image it will be easier to figure out.

With the limited information we have it could be any number of things such as artifacts of the DLP projection system in the TV or moire.

Shaun Roemich · January 11th, 2011, 12:34 PM

Assuming it was a CRT tv and not an LCD.

Probably interaction of the raster scan and the shutter in your camera being engaged.

Darker bands that "roll"?

EDIT: just re-read the original post. DLP. My bad. Need more coffee.

Renny Hayes · January 11th, 2011, 05:32 PM

Hold on, I think the DLP is a factor here. I just read about the way single-chip, color DLPs work, and it could actually make sense for it to be causing color banding. A single-chip DLP projects 3 passes for frame: one R, one G, and one B. If his camera is de-synced from the DLP, then he could be catching only fractions of each pass.

My suggestion: Use shutter-priority (Tv mode), and set the shutter speed to 1/30 or 1/60. See if things improve. If not, post a screen grab.

January 10th, 2011, 12:17 PM	#1
Norris Combs Major Player Join Date: Apr 2008 Location: OC, CA Posts: 344	Why do I see color bandings? I was recording a short clip of a TV program, by just holding the camcorder in front of the TV. Upon playback, I see color bandings on the camcorder's LCD screen. I haven't transferred the footage to my computer yet, so I'm not sure if the color bandings are only seen on the camcorder's screen, or was it actually recorded and will also be seen on my computer monitor. What causes the bandings? What can be done to prevent them? Thanks! Camcorder: Canon HFS100 TV: Mitsubishi WD-73738 DLP

January 10th, 2011, 12:38 PM	#2
Chris Medico Inner Circle Join Date: Aug 2006 Location: Efland NC, USA Posts: 2,322	If you can post a screen grab of the image it will be easier to figure out. With the limited information we have it could be any number of things such as artifacts of the DLP projection system in the TV or moire. __________________ http://www.LandYachtMedia.com

January 11th, 2011, 12:34 PM	#3
Shaun Roemich Inner Circle Join Date: Sep 2002 Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada Posts: 4,088	Assuming it was a CRT tv and not an LCD. Probably interaction of the raster scan and the shutter in your camera being engaged. Darker bands that "roll"? EDIT: just re-read the original post. DLP. My bad. Need more coffee. __________________ Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster www.roaddogmedia.ca Blog: http://roaddogmedia.wordpress.com/

January 11th, 2011, 05:32 PM	#4
Renny Hayes Regular Crew Join Date: Dec 2010 Location: Chicago, IL Posts: 26	Hold on, I think the DLP is a factor here. I just read about the way single-chip, color DLPs work, and it could actually make sense for it to be causing color banding. A single-chip DLP projects 3 passes for frame: one R, one G, and one B. If his camera is de-synced from the DLP, then he could be catching only fractions of each pass. My suggestion: Use shutter-priority (Tv mode), and set the shutter speed to 1/30 or 1/60. See if things improve. If not, post a screen grab.