Weird colour banding!- GY-HD101 at DVinfo.net

Go Back   DV Info Net > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

JVC GY-HD Series Camera Systems
GY-HD 100 & 200 series ProHD HDV camcorders & decks.


Reply
 
Thread Tools Search this Thread
Old May 30th, 2007, 06:43 AM   #1
Regular Crew
 
Join Date: Oct 2006
Location: London, uk
Posts: 99
Weird colour banding!- GY-HD101

Would anyone be able to diagnose the following?

We were testing our GY on an ABC 100 camera crane the other day, and noticed strange colour banding. As you can see, from the following images, theres strange red to green horizontal bands. subtle, but they're there. The problem has remained since removing camera from the crane, and is most noticeable when over exposing, and least noticeable when under exposing the camera. Lens used is the standard fujinon affair that came with the 101

Banding remains regardless of white balance. I've loaded various scene files, and they also remain. The dont move, and are constant.

Initaially i suspected that the servo motor magnets from the crane might have interfered with the camera in some way? Even though i'd expect the motos on a camera crane to be sheilded.

The crane was plugged into the lens servo, to adjust zoom, so is it possible stray voltage could have entered the camera this way and done some damage?

Has anyone had a similar problem?

http://i7.photobucket.com/albums/y27...mus/crane3.png

http://i7.photobucket.com/albums/y27...mus/crane2.png

http://i7.photobucket.com/albums/y27...mus/crane1.png

Any help would be much appreciated

Last edited by Peter Ford; May 30th, 2007 at 06:48 AM. Reason: to correct my grammer!
Peter Ford is offline   Reply With Quote
Old May 30th, 2007, 09:29 AM   #2
Regular Crew
 
Join Date: Sep 2006
Location: Piraeus, Greece
Posts: 53
Hi Peter,

From the frames you posted it is very difficult to diagnose a problem. Can you post some 720p frames?

The only thing i notice that might be an issue is a reddish to greenish gradient from top of the frame to bottom. Is that what you mean?
Miltos Pilalitos is offline   Reply With Quote
Old May 30th, 2007, 09:40 AM   #3
Regular Crew
 
Join Date: Aug 2005
Location: Steilacoom Washington
Posts: 72
Peter,

Do a search for "color banding" or "red gradient" on this forum. You'll find your answer there.

Basically, you can minimise the banding by not shooting wide open; stop down to at least f2.8, preferably f.4.

Gary
Gary Morris McBeath is offline   Reply With Quote
Old May 30th, 2007, 10:49 AM   #4
Major Player
 
Join Date: Jun 2006
Location: N. Ireland
Posts: 370
Peter
This seems to be a weakness with the stock lens and to a lesser extent the more expensive replacement lenses. The new HD200 series cameras aparently have a built-in feature to compensate for this.

Here is a recent thread here discussing this very issue:

http://www.dvinfo.net/conf/showthread.php?t=93536


Drew
Drew Curran is offline   Reply With Quote
Old May 30th, 2007, 11:04 AM   #5
Regular Crew
 
Join Date: Oct 2006
Location: London, uk
Posts: 99
thanks for the replys everyone

Strange- i've used this camera for ages, and i've never noticed it before. It does seem to be lateral chromatic abbervation though- it goes away when i close the iris up.

Hmmm- i might ring up jvc tommorow and see if they're engineers can 'tune' the camera to the lens or something
Peter Ford 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 > JVC ProHD & MPEG2 Camera Systems > JVC GY-HD Series Camera Systems

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 10:13 AM.


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