Green fuzz on captured footage 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 December 2nd, 2009, 03:48 AM   #1
New Boot
 
Join Date: Jan 2008
Location: Los Angeles, CA
Posts: 9
Green fuzz on captured footage

Hello guys, hope you know about this problem... I am working on a regular dv sequence.. and notice that I get this fade of green in the top right half of the screen.

It looks like a distortion but really mechanical since it shows a border in the top half of footage.. i included a picture of this problem.. it is the green fade to disolve.

Any input is appreciated.
I have also seen this problem on HDV 30P footage as well. I thought it was a computer display problem but it actually makes it to DVD or YOUTUBE.

-JVC HD-100
-Captured using NTSC/DV 720x480 on a same setting sequence..
Attached Thumbnails
Green fuzz on captured footage-greenfadeprblm.png  
Gibran Jimenez is offline   Reply With Quote
Old December 2nd, 2009, 05:17 AM   #2
Trustee
 
Join Date: May 2005
Location: Allen, Texas U.S.A
Posts: 1,117
Gibran,

Its seems you were shooting with existing light. Did you shoot this using stock lens at full open? Like f1.4-f1.8 ? If you did then its due to lateral CA on the stock lens. You can see this clearly when shooting on a gray or white wall. Go wide and full open. You'll see the green and magenta CA.

It starts going away at f2. Gone by f2.8.

Ted
Ted Ramasola is offline   Reply With Quote
Old December 6th, 2009, 07:55 AM   #3
Regular Crew
 
Join Date: May 2009
Location: Schwabach (Germany - Bavaria)
Posts: 199
it is not CA, it looks like a green flare in the top of the picture,
it can cause due to the light fall in the optic, when you use a greater
sunshade the problem will be solved.
Eric Deyerler is offline   Reply With Quote
Old December 6th, 2009, 02:17 PM   #4
Regular Crew
 
Join Date: May 2006
Location: Sydney, Australia
Posts: 91
It's from the fluorescent light tubes. Much of the scene is probably lit directly with the downlights (in the little round holes) which are tungsten. The lighting concealed higher up and reflecting off the ceiling is flourescent and has a green hue.

Back in film days a magenta or "negative green" gel was used to correct this.

It's not CA which occurs on contrasty edges and is a lens problem, there's nothing wrong with your camera.
Phil Balsdon is offline   Reply With Quote
Old December 7th, 2009, 02:40 PM   #5
Regular Crew
 
Join Date: Mar 2008
Location: Jurbise, Belgium
Posts: 29
I second the fluorescent tubes theory. "Minus green" gels solve the problem. Secondary color correction with a digital grad filter probably will take care of it too.
Taylor Brush is offline   Reply With Quote
Old December 7th, 2009, 06:17 PM   #6
Regular Crew
 
Join Date: Feb 2006
Location: New York
Posts: 124
Yup,
Taylor, Phil, Eric and Ted have nailed it. I do a series of tv commercials for a retail chain that just loves to shoot in their stores. had a similar problem first time out when lighting. Couldn't shut the entire store down, so, placed Tough minus green over the overhead flourescents and Whalaa! problem gone. Just check what types of flourescents you are dealing with and adjust you gel correction accordingly.

Cheers,
Jay Webster
NYC Director/Cameraman
Jay Webster is offline   Reply With Quote
Old December 7th, 2009, 06:19 PM   #7
Regular Crew
 
Join Date: May 2009
Location: Schwabach (Germany - Bavaria)
Posts: 199
The same green fuzz get a user with one of the first HM700.
I know it also in some lighting situations, but when you know it,
you can solve it
Eric Deyerler is offline   Reply With Quote
Old December 12th, 2009, 05:17 PM   #8
New Boot
 
Join Date: Jan 2008
Location: Los Angeles, CA
Posts: 9
Wow, thanks for the info...

This is the second time it happens.. The first time was also indoors with flourescent lights.. so basically a "minus green" is a gel that would be wrapped around a set of lights?

Thanks for all your responses,, i'll check more constantly next time.
Gibran Jimenez is offline   Reply With Quote
Old December 13th, 2009, 10:28 AM   #9
Regular Crew
 
Join Date: Feb 2006
Location: New York
Posts: 124
Green fuzz

The gel goes over the fluorescent light.

Jay Webster
NYC, NY
Jay Webster 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 05:00 AM.


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