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Problems with Canon 5D mk2

 
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Six Ways



Joined: 20 Apr 2012
Posts: 1

PostPosted: Fri Apr 20, 2012 2:06 pm    Post subject: Problems with Canon 5D mk2 Reply with quote

Hi, I've been using NV for a while with my Canon 550D with excellent results. I've built a series of noise profiles for the camera using the Neat Image calibration target. These profiles have qualities of around 85%, which I'm happy with.

I've recently been using a friend's 5D mk2 on a shoot, working under the assumption that I could do exactly the same thing - build some profiles and easily apply NV. However I've found it impossible to build good profiles using the calibration target.

NV tells me that most of the squares are not uniform or have clipping. I've tried all the settings I can think of, with different amounts of defocusing, different exposures, different picture profiles, shooting a printout and a high-quality LCD monitor, trying to get even lighting etc etc... nothing seems to work. I never even tried hard with the 550D, I just shot the printed target without any planning, and it worked great.

I've even tried just shooting a plain, evenly lit white wall, blurred out, and NV claimed it couldn't find any consistent area large enough to build a profile. I'm at a loss here! Any thoughts?
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NVTeam



Joined: 01 Sep 2005
Posts: 2238

PostPosted: Fri Apr 20, 2012 8:18 pm    Post subject: Reply with quote

There may be not enough noise in some of the channels and then primary source of imperfections are the compression artifacts. They are usually non-uniform, which is reported by the profiler. However, they are very weak and using them for analysis will not really break anything in this case. So, the solution is to simply ignore those warnings and build a profile using such an area. After all, that is just an information message, a suggestion that may help to improve the results, in cases when it is possible to implement it. It can be ignored too. This is exactly the case when it can be ignored. And in this case please evaluate the results visually, using the preview, rather than just checking the profile quality indicator.

Hope this helps,
Vlad
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