Kerry Pierce Offline Upload & Sell: Off
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Andre Labonte wrote:
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Thanks Kerry,
Thanks. On the 1st set I did not realize that Capture NX-D was applying some heavy NR when converting from RAW to JPG ... I figured it out after posting the images (read further on in the thread). On the 2nd set (2nd game; this thread) I made sure no NR was applied to the images in conversion.
Regarding the WB ... I know that WB is not supposed to effect the noise and image quality when shooting in NEF format, and that certainly holds true at ISO values of 1600 and below. But I'm finding that at these super high ISO values (>10K), that is not necessarily holding true.
I shot two games on the same field under the same lights with the same D7200 and all the same setting with the exception of WB. The first game I shot with the WB at a color temp of 5200 and corrected in post using Capture NX-D and the second game I shot with the WB at a color temp of 3900 (the correct setting) and the image quality is significantly better from the second set of images.
Others in the sports forum seem to have had the same experience with their cameras at HIGH ISO settings (e.g. 10K and above). I did not believe it at first but my personal data set with my D7200 has convinced me it's true.
Whether it's a camera or software issue I cannot tell you.
Cheers,
Andre
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Thanks for the info, Andre. Other than just fooling around, I've never shot anything higher than 6400 ISO, and even that is rather rare these days. So, the notion that WB may affect noise above 10K is beyond my experiences and quite interesting. I'll have to keep that in mind and maybe do some testing to see how that works out. Snapsy seems to be Da Man on that stuff.
One thing you need to be careful of is how much NR a given program/camera will perform without your being able to control it. AFAIK, most Nikons will automatically do a certain amount of NR as the ISO goes higher. The same applies to Nikon Capture, I think and probably NX-D as well. IOW, I think that with those programs/cameras, you're going to get a certain level of NR whether you want it or not.
Regardless, there were (are??) many artificial lighting situations where a good WB is impossible to get, ie mercury, sodium vapor and even fluorescent lighting that fluctuates in color and intensity with the AC current. Here's a sample below, which shows distinct differences in color and brightness due to the fluctuation of the overhead lighting. I have dozens of these type photos from various local hockey rinks, which seem to be the worst offenders where I live.
http://www.pbase.com/kerrypierce/image/70019905.jpg
WRT to selective application of NR, there are several programs and methods of doing that. I've not needed to do it for quite some time, but I assume that modern NR tools still have the same methods. IIRC, Noise Ninja or Noiseware had a noise "brush" that you could use selectively. Most commonly, I just used selections and/or layers to do the areas that needed it.
Good stuff, Andre. I always like learning stuff and you're getting me charged up with new incentives to maybe get back into the game a little.
thanks
Kerry
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