Johannes, thank you very much for your email.
Am 09.12.2012 06:51, schrieb johannes hanika: > cool, silkypix is doing wavelet soft shrinkage? You can see this from the picture? Crazy :-) My first hit with a search engine shows that "wavelet soft shrinkage" is known since at least 1999. Is this still "the best" method for noise reduction today? What is "the best" method today? What methods are used by the big commercial raw tools? Is this known? > here's my result (not optimal gathering stats from just your one shot): Does this mean, your algorithm "learns" from pictures how noisy my camera is? > http://picpaste.com/denoised_01-9U4IYbUL.jpg [4.0M] > > and with extra chroma denoise in eq: > > http://picpaste.com/denoised_extra_chroma-W1XBZHwi.jpg [2.7M] That looks very good :-) Compared to silkypix, your result has sharp edges even at 100% view. A drawback is, that it looks a little blotchy (for example, comparing the vertical white to black transition in the background). > and for reference the same file processed in dt without denoising (but > same exposure): > > http://picpaste.com/input_01-kBP1IlAR.jpg [6.7M more compression, > other was 20.0M] Yeah, this is quite a difference. > i was trying to match your exposure settings, you needed like +2--3ev? > > in general (at least for my camera) the analog gain (iso) is a better > idea to use than the digital (+2ev in darktable) wrt noise. My picture was not planned - therefore the non-optimal settings. But, I found it to be a good test for noise reduction ;-) I forgot to mention, that my camera (like most Sony and Pentax dslr cameras) does produce "half-cooked raw" at ISO3200. http://www.dxomark.com/index.php/Publications/DxOMark-Reviews/DxOMark-review-for-Pentax-cameras Maybe, that also effects the performance of your denoising. > i'm writing a blog post and a new one-click denoising module that goes > with it. i hope i can push it out before christmas, if you urgently > need to get some photoshoot done which is blocking your pay for this > month let me know. I'm not in a hurry. If you need test files or a beta-tester, please let me know. I would be happy to help. Michael > cheers, > jo > > On Sun, Dec 9, 2012 at 11:36 AM, johannes hanika <[email protected]> wrote: >> cool that works, thanks. will look into that later today. >> >> jo >> >> On Sun, Dec 9, 2012 at 3:05 AM, Michael Born <[email protected]> wrote: >>> Am 08.12.2012 01:00, schrieb johannes hanika: >>>> To download this file you need to disable your adblocking software! >>>> >>>> :( >>>> >>>> do you have a non-malware place to get your example files? >>>> >>>> j. >>> >>> Very strange. >>> With my firefox + adblock + noscript I just have to wait a few seconds. >>> Then I can download the files. >>> >>> https://rapidshare.com/files/78270153/IMGP3139.DNG >>> >>> The Silkypix jpg >>> http://rapidshare.com/files/3288236700/IMGP3139.jpg >>> >>> My DT result >>> http://rapidshare.com/files/999961954/IMGP3139_04.jpg >>> >>> Hope, this works for you. >>> >>> Cheers, >>> Michael >>> >>> >>>> On Sat, Dec 8, 2012 at 12:41 PM, Michael Born <[email protected]> >>>> wrote: >>>>> 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. 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