I hate to say this, but I have not been happy with Noise Ninja (inside Photo Ninja) for noise reduction when there are moderate to high levels of noise present. And I have done head to head comparisons with DxO Prime that I have shown on this site, though I don't feel like searching for them at this moment. Prime NR is the main reason that I have DxO Optics Pro 10 on my computer.
Rob
Do you have any tips and pointers for the prime noise module? Obviously I'll spend loads of time experimenting with my own photos but I like picking up things from people when it comes to new software
When I use Prime, I've often found that I can turn Luminance NR down from the default settings; I use the minimum that gets rid of visible noise.
That's what I do as well. The default setting for Luminance is 40, but I usually end up somewhere between 10-25, depending on the image. Also, I do not try to remove every last scintilla of noise. A little grain is fine with me. The only problem that I have had with Prime is that it has a tendency to make out of focus areas blotchy, which may or may not be objectionable at normal viewing size. It will be interesting to see if DxO fixes that in v11.
Rob
What Rob points out here is correct. DxO Prime can easily posterize dark/shaded areas which creates unnatural blotchy patches. I don't like this artifact any more than I do the plasticized surfaces other noise reduction engines generate when over-driven.
I can see how DxO Prime's method can work slightly better with photographs of mainly high contrast edges (type on white paper, printed circuit boards, etc.) where the tonal variations are small and posterized smoothing has less of a visual impact.
But most typical photographs involving people & places have tremendous tonal variation and here is where I think both Photo Ninja and Capture One intelligently trade some residual noise for greater tonal depth that appears... well, more natural looking for lack of a better description. Pictures are worth a thousand words but this was an example from a few months ago.
ISO 6400 RAW converted with DxO 10 by Keith using Prime NR (100% Crop):
And, ISO 6400 RAW converted with Photo Ninja by me Noise Ninja 3 NR (100% Crop):
Look at the faces, the DxO looks artificial and the PN looks natural. I prefer the latter tonal rendition of Photo Ninja noise reduction over DxO's for that reason. Capture One handles it similarly.
fPrime