Reds are flickering/flashing... at DVinfo.net
DV Info Net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders
Register FAQ Today's Posts Buyer's Guides

Canon XL and GL Series DV Camcorders
Canon XL2 / XL1S / XL1 and GL2 / XM2 / GL1 / XM1.

Reply
 
Thread Tools Search this Thread
Old October 19th, 2005, 04:14 PM   #1
New Boot
 
Join Date: Aug 2005
Location: Austin, TX
Posts: 22
Reds are flickering/flashing...

I just shot a spot where I shot a bunch of bright reds. Everything that is red in each shot is flashing or flickering. It is really nasty too, especially when I enhance the colors in post. Does anyone know if there is software to correct this in post or if there is a way to control it from the camera? I'm cutting on Premiere Pro with the Canopus DVstorm2 card.

Or just an explanation would be nice. I know that I should try and avoid shooting anything bright red on video, but this is ridiculous.
Ben Hurst is offline   Reply With Quote
Old October 19th, 2005, 07:43 PM   #2
Major Player
 
Join Date: Oct 2005
Location: Long Island, NY
Posts: 208
See this thread: http://www.dvinfo.net/conf/showthread.php?t=52718
__________________
~Justine

"We are the music makers, and we are the dreamers of dreams" -Arthur O'Shaunessey (as quoted by Willy Wonka)
Justine Haupt is offline   Reply With Quote
Old October 19th, 2005, 07:59 PM   #3
Trustee
 
Join Date: Dec 2004
Location: Lipa City Batangas, Philippines
Posts: 1,110
Hi Ben. Strange effects I have seen with my XL2 are white balance fluctuating when shooting under fluorescent lights with the shutter speed too fast and flashing or flickering when something in the image has very fine grid-like details. So far, I haven't seen anything like you describe and I have taken shots with v-e-r-y saturated reds due to inadvertantly leaving the saturation adjusted too high.

Can you let us know what mode the camera is in? (e.g. I usually shoot in Tv mode or full manual.)

Richard
Richard Hunter is offline   Reply With Quote
Old October 20th, 2005, 10:16 AM   #4
New Boot
 
Join Date: Aug 2005
Location: Austin, TX
Posts: 22
Thanks for the thread link...the forum wouldn't let me search yesterday.

I was shooting in Tv mode in 24p. Exposure was right between 4 -5.6. I shot some of the footage with my custom settings on and some with it off and still had the flickering. I know that this is not just an XL2 problem. I had the same problem years ago with the PD-150. Anyway, I hope someone comes out with a post solution soon, or hope that the H1 won't do that.

Here is a link to the spot. I'm not sure if you'll be able to see the flashing but look for anything red.

www.fueldfilms.com/Feet.mov
Ben Hurst is offline   Reply With Quote
Old October 20th, 2005, 06:12 PM   #5
Wrangler
 
Join Date: May 2003
Location: Eagle River, AK
Posts: 4,100
Hi Ben,

Have you verified that you see the flickering in the source 720x480 AVI file?

The QT clip is extremely compressed. All I really percieve is edge blockiness (as expected, most noticeable in diagonal lines when there is slight motion in the video) and color averaging where there were chroma gradients. I would attribute both of those effects to compression. The eye catches motion in the bright red better than other colors; that would be true even if the motion only exists because of artifacting, rather than actual motion in the higher resolution source footage.

When I looked for the same migratory blotchy look (color averaging) and the edge artifacts in the other colors, I saw them. A good example is the bright blue plastic chair on the right of the image just over half way through. Where natural reflections cause the imaged color to lighten, you can see a blurred, shimmering effect as the compression changes a bit frame to frame.

That said, there is a known 24p anomaly in PPro that causes strobing in super-white images. I don't know if oversaturation in one color could do the same. See: This Post

I'm not saying it ain't there; just that I don't think I'm seeing what you're seeing, or at least interpreting it very differently. So I guess step one is to view a 30p or 60i source AVI clip and see if whatever you're seeing in the MOV is actually in the source. If you can post a short MS DV AVI from your project, that would be great.

Oh, another quick thing to try would be to add a Broadcast Colors filter before rendering and see if that changes anything.

Cheers.
__________________
Pete Bauer
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. Albert Einstein
Trying to solve a DV mystery? You may find the answer behind the SEARCH function ... or be able to join a discussion already in progress!
Pete Bauer is offline   Reply With Quote
Old October 22nd, 2005, 07:56 PM   #6
New Boot
 
Join Date: Aug 2005
Location: Austin, TX
Posts: 22
Thanks Pete. I'll look into a few of those things on Monday!
There is flickering in the original footage. I applied a few filters to boost colors and the flickering worsened. The flickering is kind of hard to see in the small quicktime. I'll see if I can't post a different version.

Thanks
Ben Hurst 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...

B&H Photo Video
(866) 521-7381
New York, NY USA

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


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 XL and GL Series DV Camcorders


 



All times are GMT -6. The time now is 09:30 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network