A1 having Gain/WB Problem ( Not AGC) Under Multiple Lights at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


Reply
 
Thread Tools Search this Thread
Old October 13th, 2007, 06:51 PM   #1
Tourist
 
Join Date: Nov 2006
Location: Cork, Ireland
Posts: 2
A1 having Gain/WB Problem ( Not AGC) Under Multiple Lights

Hi All,

I'm currently in the process of filming a training video for a hair salon. I'm using two A1s. Both have gain L set to -3db. When I went to review the first days footage there seems to be a large amount of "fluxing" gain or grain in the image. The salon we're filming in has lots of lights, some flouresent, some halogen spots and some normal Tungsten incandencents so I did try to manually set the WB with a 100 IRE card. The image I'm getting is washed out, the blacks look gray and everything is grainy. Does anybody have any ideas of CPs to try and combat this?
I've uploaded a 4 second clip ( shot at 25F and imported to FCP at 1080p25, exported to 720p H264). If you look at the black in it you should see what Im talking about.

http://fyp.ie/declan/XH-A1%20Grain%2...20p%20H264.mov

Any help would be greatly appreciated

Declan

Last edited by Declan Casey; October 13th, 2007 at 09:07 PM.
Declan Casey is offline   Reply With Quote
Old October 13th, 2007, 07:03 PM   #2
Contributor
 
Join Date: Jan 2003
Location: Kansas City, MO
Posts: 4,449
Clip doesn't work; I go this:

The requested URL /declan/XH-A1 Grain%2...20p H264.mov was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/1.3.37 Server at fyp.ie Port 80


If things look grainy that's usually an indication of shooting on a higher gain. Are you sure all the auto stuff is off and you're in the manual mode, not one of the auto ones?
Bill Pryor is offline   Reply With Quote
Old October 13th, 2007, 07:09 PM   #3
Inner Circle
 
Join Date: Feb 2007
Location: Fairfield, Dunedin, New Zealand
Posts: 3,634
Images: 18
Hi Declan..............

That link won't even persuade Explorer to get out of bed.


CS
Chris Soucy is offline   Reply With Quote
Old October 13th, 2007, 08:15 PM   #4
New Boot
 
Join Date: Sep 2007
Location: Waco, Texas
Posts: 6
try this link:

http://fyp.ie/declan/XH-A1%20Grain%2...20p%20H264.mov
Taylor Rudd is offline   Reply With Quote
Old October 13th, 2007, 09:08 PM   #5
Tourist
 
Join Date: Nov 2006
Location: Cork, Ireland
Posts: 2
Link Fixed

Links is fixed now, sorry about that

Declan
Declan Casey is offline   Reply With Quote
Old October 15th, 2007, 01:09 PM   #6
Major Player
 
Join Date: Mar 2007
Location: Philly,PA
Posts: 360
yeah, i see it in the dark areas. that's actually pretty typical for HD.
turn on any hdtv channel and you will see it. reds and dark browns will do it.

you will need to magnify and check those types of colors for noise before you shoot. sometimes you can correct the exposure and tone it down.

the shot is a little underexposed on the subjects and you have that light in the back shining right through them. i think that might be the reason too.

if you are using auto exposure, it's going to underexpose the subjects and properly expose the light.

regardless, i find it acceptable. with those two girls in the front, nobody is looking at the wall.
Eric Weiss is offline   Reply With Quote
Old October 15th, 2007, 01:39 PM   #7
Wrangler
 
Join Date: Jan 2005
Location: Boulder, CO
Posts: 3,012
i'd set the gain to 0 for indoor shooting, -3 is really for outdoor shooting with the HMI in the sky. adding gain seems counter-intuitive to solving a noise issue, but it might help smooth things out a bit...
Meryem Ersoz is offline   Reply With Quote
Old October 15th, 2007, 06:44 PM   #8
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,298
Quote:
... nobody is looking at the wall...
Well, at least no red-blooded guy will look at the wall.

I would suggest that you address the bright back light from the window(?) and the overhead lights, unless you are trying to obtain that effect.
__________________
dpalomaki@dspalomaki.com
Don Palomaki 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 > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:58 PM.


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