Luminous Landscape Forum

Raw & Post Processing, Printing => Other Raw Converters => Topic started by: mburke on May 02, 2008, 10:30:55 am

Title: Noise Reduction
Post by: mburke on May 02, 2008, 10:30:55 am
Does anyone know what the real differences are in "Faster" vs. "Better Quality" in the Noise Reduction? I can't seem to see a real difference. The "Faster" sure doesn't bog my  computer down.

The same seems to be true for "D-Lighting". I can't seem to see much difference other than the computer is much more usable with the Faster settings.

Any opinions????
Title: Noise Reduction
Post by: Daniel Arnaldi on May 03, 2008, 02:43:22 am
With D-Lighting using the "Better Quality" option gives you access to the highlight recovery control, without that you only have access to the shadow control.

With noise reduction there is a difference, see below a 200% crop of a section of dark overcast storm clouds, the structure is part of a refinery tower, don't try to spot any detail in the tower, it is basically a silhouette but you can see the edge detail. The settings are the same in both cases with only the quality options changed; you can see that the chroma noise has been brought well under control without making any other adjustments.

Here is the sample using the faster setting and the sliders at default settings for an image shoot at 1600 ISO, you can see that there is still some chroma noise.

Here is the same using the “better quality” setting, using the same settings as the first example

“Faster” again, this time with more aggressive settings, you can see that there is still some chroma noise

And finally using the “Better quality” setting this time with a less aggressive setting than the above, you can see that this setting even set lower than the “Faster” examples does a better job dealing with chroma noise without a great loss of detail.

Here is the same image with no noise reduction applied for reference.

These images are not necessarily real world examples, but they do show a difference using the various settings and remember all these crops are at 200%. Also you will notice that Luminance noise has remained largely unchanged in all the examples, for me chroma noise is the only one that really is bothersome, while luminance noise reduction comes at too heavy a price in detail lost. There is no magic setting that you can rely on all the time, your going to have to make a judgment call each time but you can see that there is a real difference between the two settings.

The effect is slow to appear on screen, that is a the big problem I have with NX, a lot of functions are too slow to preview and apply, which is why I only use NX for my personal work and LR for the paid stuff, I can't afford to rely on NX when I'm on a deadline, even though it has better features it is just too slow.
Title: Noise Reduction
Post by: mburke on May 03, 2008, 08:41:21 am
Thanks for the very thorough reply. I've never seen it explained that well, especially with the examples. I'm looking forward to being able to buy a new, fast computer and awaiting the release of ver. 2.0 NX. I don't sell my work so speed isn't that important to me but I really like most of what NX does. My pictures really have great color and have snap to them. I like to print with Qimage on my Epson 2200 and the prints at our photo club always get great comments on the color and snap they have. I've tried Photoshop without the same results (although I'm sure if I spent the same amount of time on it the results would be similar).

Thanks again for the wonderful reply, very helpful

Mike Burke