Dear DT users, I read several mailing list posts about noise reduction (NR), the manual and watched the DT0.9 screen casts, but I still fail to get good NR results.
I used the following RAW to try the 4 NR methods of DT. http://www.fastshare.org/download/IMGP3139.DNG 1. RAW-NR works ok, but removes a lot of detail. 2. Non local means (NLM) I found disappointing. The chroma slider at 100% and spot size 1 seems to remove the most chroma noise - which is still very little! I had to look very closely to see that a bit of chroma noise is removed at all. 3. The Equalizer with strong NR looks promising, but a lot of chroma noise remains and an overall "grainy" appearance. 4. The bilateral filter I like the most. (the recommended settings from johannes [for his Canon with ISO3200] don't work well for my picture) With a radius of 10 and the rgb sliders at max (0.1000) the color noise mainly seems to be gone. Unfortunately, a "grainy" appearance which destroys sharp edges is also there. Using 4 together with NLM (size 1, strength 75%, luma 100%, chroma again seems to make no difference) is "the best" I could achieve. http://www.fastshare.org/download/IMGP3139_04.jpg I compared all the results at 1:1 to the Pentax RAW Tool (silkypix based). http://www.fastshare.org/dlgo/IMGP3139.jpg I looked mainly at the region between and slightly above the cups and the pot (to see the white-black transition in the background). The missing color noise is what I really like. How do you reduce the color noise of high ISO images with DT? What about the "grainyness"? Any suggestions? Cheers, Michael ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ darktable-devel mailing list darktable-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-devel
