Volunteers needed to test some new scene files... - Page 2 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 November 12th, 2005, 10:20 AM   #16
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Important Note About White-balance

It is very important that you set your white balance with a "normal" setting (CINELIKE HD24P as suggested) before loading one of the new scene files.

The problem is that if you manually set your white balance after loading the a scene file with specific colour shifting (towards green for example) the white balance circuit will counter-act it. It really sucks that the white balance circuit samples the image after it has been processed, but that's the way it is.

The other thing I want to mention is that for those of you using the SCN files I emailed, I just realized that the "preset" white balance switch was set for FAW instead of preset. FAW should be set to "NONE."

I have corrected the mistake on all of the SCN files, so please download these the revised versions here:

TD_scene_files_v2.zip

Good luck,
Tim
Tim Dashwood is offline   Reply With Quote
Old November 12th, 2005, 08:48 PM   #17
Regular Crew
 
Join Date: May 2005
Location: Stockholm
Posts: 100
Thx for that info Tim, now its starting to look like something!

I have a question. When I use the BLCHBYPASS setting I get flicker, specially in lowlight, do you know why?

I have also noticed that the iris on the Fujinon closes down when you zoom in using the settings, I dont know if its there also when using "normal" settings but its the first time I have noticed it. When I zoom in past 40 it starts to get darker and darker...looks really weird!
Soroush Shahrokni is offline   Reply With Quote
Old November 12th, 2005, 10:01 PM   #18
Major Player
 
Join Date: Apr 2004
Location: Kelowna BC Canada
Posts: 706
Quote:
Originally Posted by Soroush Shahrokni
When I zoom in past 40 it starts to get darker and darker...looks really weird!
That's pretty normal, just about every zoom lens will 'close down' toward the end of its range. Check your still camera zoom, chances are it will behave the same. Lens manufactures usually indicate that by marking the lens like this (i.e. my still Nikkor lens) 70-300mm 1:4-5.6 suggesting that at the wide end the lens (70mm) has f stop of 4, whereas at the longest focal length (300mm) it drops down to 5.6
__________________
www.ascentfilms.com
Jiri Bakala is offline   Reply With Quote
Old November 13th, 2005, 12:38 AM   #19
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Quote:
Originally Posted by Soroush Shahrokni
Thx for that info Tim, now its starting to look like something!

I have a question. When I use the BLCHBYPASS setting I get flicker, specially in lowlight, do you know why?
I don't know why you are getting flicker. Flourescent light? TV in the room?

Quote:
Originally Posted by Soroush Shahrokni
I have also noticed that the iris on the Fujinon closes down when you zoom in using the settings, I dont know if its there also when using "normal" settings but its the first time I have noticed it. When I zoom in past 40 it starts to get darker and darker...looks really weird!
That is the stock lens, you are seeing the effects faster in that setting because the blacks are crushed. We've been discussing the lens and ASA over in this thread.
http://www.dvinfo.net/conf/showthread.php?t=54054

I have also found that heavy vignetting starts at around 40mm and you lose at least 1 stop between 40mm and 88mm. The manual for the lens claims Maximum Photometric Aperature to be T1.5. It also states that the relative aperature is "ƒ1.4 (5.5mm~68mm) ~ ƒ1.8 (88mm)".
Tim Dashwood is offline   Reply With Quote
Old November 14th, 2005, 06:52 AM   #20
New Boot
 
Join Date: Nov 2005
Location: Bunbury, Western Australia
Posts: 8
Happy to Help

Hi from Western Australia.

Love to grab your files, load them and then test them. I live in Bunbury, down on the South West coast of Western Australia. Lots of different scenery, beaches (The Indian Ocean), wineries, wheatfields and late sunsets..

Kind regards
Dean
Dean Lomax is offline   Reply With Quote
Old November 14th, 2005, 09:18 AM   #21
Major Player
 
Join Date: Apr 2004
Location: Kelowna BC Canada
Posts: 706
Hello Tim,

I am getting the camera next weekend, so I'd love to have the files too. Kelowna, BC... snowy mountains and cold lake here at this time of the year.
__________________
www.ascentfilms.com
Jiri Bakala is offline   Reply With Quote
Old November 14th, 2005, 09:01 PM   #22
Regular Crew
 
Join Date: Sep 2005
Posts: 41
HDV in NYC

Tim,

I've got a ton of projects coming up in NYC. If the settings are still available, I would love to provide you with some feedback.

Best Regards,

Dave Dessel
David Dessel is offline   Reply With Quote
Old November 17th, 2005, 03:07 PM   #23
Major Player
 
Join Date: Sep 2005
Location: Ft. Myers, FL
Posts: 240
I did some tests today with your Scene files Tim. I was a little confused about the white balance settings. The first batch was using one white balance I did with Cinelike24 scn file. I then loaded each of your scene's without doing another white balance. There seems to be a problem with the white balance once a new scene is loaded. It looks way off leaning towards 3200.

I then set the white balance to preset 5600 and then loaded each scene in turn.
These are the jpgs with the 5600PSWB on the end.
Unfortunately, I bet some of your settings were defaulting the preset mode to 3200.

So, without doing a manual white balance after each load or going in and selecting 5600 preset, it's not gonna look right.

Dave Beaty

http://www.dreamtimeentertainment.com/hdv/
Dave Beaty is offline   Reply With Quote
Old November 18th, 2005, 05:18 AM   #24
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Thanks Dave. You are the first to report back.

Hmmm. The white balance is interesting. Your manual balance should have been close to 5600K anyway since it looked quite bright and sunny.

However, you did the right thing going with preset 5600K when you noticed something was off. My testing was all in a 3200K environment, but the colour shifting in the scene files should be based on the set white balance as a starting point. I will test this myself with some CTB and see what happens.

The daylight results of the colour shifted scene files are definitely not falling exactly where I had intended, so this is useful information for me me to modify the settings. At least the REVERSAL and BLEACH BYPASS settings seemed to give the expected results - but there isn't much colour shifting programmed into them.

thanks again Dave

Tim
Tim Dashwood is offline   Reply With Quote
Old November 18th, 2005, 05:23 AM   #25
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Dean, Jiri and David. I can't get to your email addresses for some reason (Chris is still working out some bugs with this new software upgrade) so:

Instructions for Scene File beta test are at:
http://www.dvinfo.net/conf/showpost....0&postcount=13

You can download the 6 .SCN files from:
http://homepage.mac.com/timdashwood/...e_files_v2.zip

Tim
Tim Dashwood is offline   Reply With Quote
Old December 31st, 2005, 02:00 PM   #26
Major Player
 
Join Date: Sep 2005
Location: Ft. Myers, FL
Posts: 240
Quote:
Originally Posted by Tim Dashwood
ADDED NOV 12: IMPORTANT NOTE ABOUT WHITE BALANCE.

It is very important that you set your white balance with a "normal" setting (CINELIKE HD24P as suggested) before loading one of the new scene files.

The problem is that if you manually set your white balance after loading the a scene file with specific colour shifting (towards green for example) the white balance circuit will counter-act it. It really sucks that the white balance circuit samples the image after it has been processed, but that's the way it is.

If you are having problems with manual white balance then just use preset 3200K for tungsten or 5600K for outside and least you will get consistent results.

Tim

Tim,

I just discovered that one should white balance after loading a scene file. Yes this counter acts the advanced shift settings, but there's no other way around it. We'll have to manually shift them after WB.

It seems the actual white balance that is in memory will be stored when saved and thus loaded when that file is later loaded back into memory. That's what it seems like based on my casual test.

Try this test, white balance and note the setting. Now load a file and check the status, it will change to the WB stored on the scene file. Just FYI.

That's why my tests of your scenes were all BLUE. :) I was shooting outside and some of your scenes load up as 3000K.

Dave B
Dave Beaty is offline   Reply With Quote
Old December 31st, 2005, 02:06 PM   #27
Trustee
 
Join Date: Apr 2005
Location: Chicago
Posts: 1,214
I think the way around what you have written is to re-save the scn file but have the white balance in FAW.

Last edited by Stephen L. Noe; December 31st, 2005 at 04:36 PM.
Stephen L. Noe is offline   Reply With Quote
Old December 31st, 2005, 03:30 PM   #28
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Quote:
Originally Posted by Dave Beaty
It seems the actual white balance that is in memory will be stored when saved and thus loaded when that file is later loaded back into memory. That's what it seems like based on my casual test.
Good observation Dave. You've discovered the "missing link" of the problem I've been experiencing with scene file WB. This has been an issue I've been trying to work out. I created the original scene files in tungsten balanced light (3000K according to the camera) and originally assumed that the captured WB A and B values were not stored with the scene file. It is a silly way to do things, but we have to deal with the fact that on the HD100 everything is recorded in the scene file. I wish it worked like the XL2 and only saved actual image parameters and not switch settings.

The other problem I've been encountering is that the WB PAINT values seem to be absolute instead of using the base WB value as a starting point.
If WB PAINT was not based on absolute values, then it should have worked like a physical colour correction filter, and therefore had the same effect in any properly white balanced setting. I'm still testing this aspect of WB PAINT.

So, in the case of scene files that do not use WB PAINT values you can obviously white balance after loading the file or use a 3200K or 5600K preset. These include FILM NOIR, BLEACH BYPASS, REVERSAL, CINE WIDE LATITUDE, LOW LIGHT, & FILMOUT.

In the case of WARM, WARM GREEN, FILM VERT or the DVX100 MATCH scene files, only use them in tungsten balanced light (for now) with 3200K preset. I will rename these original files as "3200K" and then create additional 5600K versions with different WB PAINT values. This is the only way I can think of to work with the JVC method of scene file storage.
__________________
Tim Dashwood
Tim Dashwood is offline   Reply With Quote
Old December 31st, 2005, 05:32 PM   #29
Major Player
 
Join Date: Oct 2005
Location: Hollywood, California
Posts: 882
Quote:
Originally Posted by Tim Dashwood
I will rename these original files as "3200K" and then create additional 5600K versions with different WB PAINT values. This is the only way I can think of to work with the JVC method of scene file storage.
Will you post those files? Thanks Tim
Brian Duke is offline   Reply With Quote
Old January 1st, 2006, 04:48 PM   #30
Major Player
 
Join Date: May 2005
Location: Portugal
Posts: 282
Tim, do you need some more footage from us? I just followed your instructions and my shots are also too blue... I will shoot again white balancing after loading the scene files.
Diogo Athouguia 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 07:41 AM.


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