On Mon, Dec 16, 2013 at 01:40:23PM +0100, Halgeir Kjønås Rennehvammen wrote: > On other camera systemes with a different sensor like Pentax, Sony > og Nikon this is a non existing problem.
I use Sony cameras, and I'd have to disagree. The noise behavior of both my a550 and a57 is very "chunky", resulting in splotches of color, making noise reduction extremely difficult. For about ISO 800 and below, I just use profiled denoise in wavelet mode with a low strength (around 35%) as a "good enough" filter. Some fine grit remains but most of the detail is preserved. For higher ISO settings, or when I have to boost the exposure a lot, my best solution so far has been to enable: 1. hot pixels at quite aggressive settings (low threshold, high strength, detect by 3 neighbors) 2. denoise (profiled) in wavelet mode, blend color, and strength quite high (sometimes right up to 4) to smooth out the splotches 3. denoise (non-local means) luma at 100%, strength depending on how noisy the shot is after exposure adjustments. For whatever reason, I've found the non-local means denoise better than profiled denose in non-local means mode, in part because I can tweak the settings more. FWIW I even went so far as to increase the hard-coded neighborhood size in the source code. It helps a little, but comes at a huge performance cost of course. -- Bruce Guenter <br...@untroubled.org> http://untroubled.org/
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