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5DMKII color artifacts problem

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Janne Laiho
5DMKII color artifacts problem
on Mar 29, 2011 at 11:33:30 am

Hello,

I'm shooting 1080p 25 fps PAL with Canon EOS 5DMKII. I've had the camera for several months, and I've not experienced any such problems before, but now I'm occasionally getting color artifacts such as in the below screen shot (notice the ventilation grill on the door):



Any idea what might cause this?

Cheers,
Janne


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Dave LaRonde
Re: 5DMKII color artifacts problem
on Mar 29, 2011 at 9:34:39 pm

That's a moiré pattern, caused by the intersection of fine lines such as those composing the vent screen on that door. Every kind of camera makes such patterns to some degree or another, and every kind of camera has a different reaction to them.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Peter Burger
Re: 5DMKII color artifacts problem
on Apr 1, 2011 at 12:13:38 pm

The Canon VDSLRs are known for their problems with moiré and aliasing. Most people agree that the best method to reduce the problem is to turn the internal sharpening down completely and reintroduce sharpness (if needed) in post.


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Bill Davis
Re: 5DMKII color artifacts problem
on Apr 3, 2011 at 6:50:11 pm

While these are real problems in the real world - I just want to note for the vast majority of folks who read about this stuff rather than doing it - I've been shooting the 5dMkii for more than two years now, and I've had exactly ONE shot that was unusable due to Moire in those two years.

Yes, its' "an" issue. But it's NOT a big deal, and in general practice, unless you're working for a picket fence manufacturer - it's largely a 'once in a while" deal - (maybe a bit like RF problems in Audio) NOT a major technology flaw.

My "street" experience, anyway.

FWIW.

"Before speaking out ask yourself whether your words are true, whether they are respectful and whether they are needed in our civil discussions."-Justice O'Conner


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maurice jansen
Re: 5DMKII color artifacts problem
on Apr 3, 2011 at 7:50:22 pm

hi there

indeed it is something you have to live with.

the effect is called alliasing.
in the end all sampling systems (and that includes video camera's)
will be faced with this issue.
but one camera is better filtered then the other.
but all camera's have to cope with this phenomena.

in the 5D the filtering and scaling is done in a very simple way.
and next to that the sensor has a very high resolution so can create
high frequencies on the scaler input which can result in extreme alliasing.

next to that the 5D has a bayersensor the red green and blue pixels do not allign spatially like in a standard 3chip camera.
which makes that the moire pattern produced by aliasing will be on different places. which give funny colors on places where there is actually no color.

again this isn't a problem of the 5D only

is this a big problem

depends on your genre and or shooting environments.
if you know what causes this you can anticipate on it.
in a industrial enviroment where straightline's and repeating
elements are common you will be faced whit this more often
then when you shoot wildlife.


grt

People saying they don't make mistake's often make nothing at all!


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Bob Dix
Re: 5DMKII color artifacts problem
on Apr 5, 2011 at 9:08:41 am

Check out your video card , may need to upgrade, but, the odd grill and horizontal line patterns are at times even on commercial broadcast, it is no big thing. I have used the Canon 5D Mark II HD 1920 x 1080p for two and a half years and a 3ccd Panasonic , you may get the odd hiccup ?

Ps. You could edit this out in Premiere Pro ?

Freelance Imaging & Video
AUSTRALIA


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Brent Dunn
Re: 5DMKII color artifacts problem
on Apr 7, 2011 at 7:53:40 pm

Here's the fix for the Miore problem. This plugin was just created for Final Cut Pro.

http://colorbyjorg.wordpress.com/plugins/

Brent Dunn
Owner / Director / Editor
DunnRight Films
DunnRight Video.com
Video Marketing Toolbox.net

Sony EX-1,
Canon 5D Mark II
Canon 7D
Mac Pro Tower, Quad Core,
with Final Cut Studio

HP i7 Quad laptop
Adobe CS-5 Production Suite





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Janne Laiho
Re: 5DMKII color artifacts problem
on Apr 14, 2011 at 11:53:09 am

Thanks, all!

The FCP plug-in sounds interesting, however as it's restricted to non-commercial use, I won't be able to use that. I guess it's a question of being aware of the prolem and perhaps occasionally trying to correct such problem footage in AE etc.

Cheers
Janne


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