Originally posted by Eric Seavey
Indeed, the ACR is pretty decent, and very fast. For weeks I have been deciding whether to upgrade my noise reduction plugin with Topax Denoise or Photo Ninja. I timed both plugins, and using Noise Ninja 4 Turbo option in Photo ninja makes the processing duration similar to Denoise. However, Noise Ninja 4 is significantly slower, though on my photos I haven't been able to tell the difference between turbo and non-turbo results. In the end, the Photo Ninja with its 4 sliders, is incredibly easy to use, where Denoise has the "Overall Strength" that controls most of the noise, and further tweaking can be followed up. Denoise seems to have the edge up on color rendering, as Photo Ninja finishes with a slight blueish tint. I went into Adjustments->Levels, and adjusted the Shadow Input Adjustment of the blue channel to 10, and that improved the image. For a quick Noise Reduction process, there is of course the option to use the ACR or Noise Ninja 3.
One strong point that Photo Ninja has is its raw conversion blown highlight recovery, that even tops ACR. I tend to intentionally under-expose many photos with lights or bright areas so that I don't have blown out areas. So sometimes I would even want to use the Photo Ninja Raw conversion plugin, and conveniently use the exposure adjustments in Photo Ninja to improve the lighting.
I ended up buying the Photo Ninja, but really think Noise Ninja 4 and Topaz Denoise are on par for noise reduction, depending on one's needs. Each have some strengths and weaknesses.
I have not yet tried the Sagelight noise reduction, because it cannot (yet) be used as a plugin to Photoshop, however, I have heard good things about its performance.
There is a new contender for top noise reduction software--DxO 9's Prime NR module. It is
very impressive at retaining detail, although I have noticed a tendency towards blotchiness in out of focus areas. However, unless you have a relatively new, fast computer, it is slow in operation and very slow in rendering to output. Overall, I like DxO 9, although I still prefer Photo Ninja's raw conversions.
BTW, if you think that PN produces a slight bluish tint, it should be a simple matter to correct that in the Color Correction module. No need to do it in Photoshop, which is what you seem to be describing. Either way, use what works.
Rob