I've noted similar issues with my Sony NEX-C3 at high ISO. at 200-400 iso noise profiling is simply awesome in its default setting. At high ISO I get artifacts too. I assume that I need to do my own profiling for my own sensor at higher iso's, 3200 ISO. But being time limited, I use noise profiling with wavelet and select hue instead of normal. It gives me the least color artifacts. I also add some bilateral filtering on the color for the other and non-local means filtering on lightness. The combinations seems to give less artifacts that using multiple wavelet from my experience.
Best, Gert On Mon, May 27, 2013 at 10:02 PM, johannes hanika <[email protected]> wrote: > thanks, not sure what kind of help i would ask for at this point. i > noticed that your flattened histogram even with a slightly improved fitting > procedure that i just tested (will push later, doesn't really help all that > much so far) has a 2x noise std deviation for dark regions. some other > cameras have way worse behaviour than that for brightnesses < 0.2, but > maybe this is enough to confuse the algorithm. i fitted a gaussian to that > error and instructed the wavelet denoiser accordingly, but so far results > aren't a lot better than what we had before. > > i could get way better results using the equalizer and manually pulling up > the threshold for the chroma channels (start from `chroma denoise' preset > and push it to the extreme basically). > > i hope to do some more tests on that tomorrow. > j. > > > > On Tue, May 28, 2013 at 6:21 AM, Baptiste Pierrat < > [email protected]> wrote: > >> I´m willing to help if you want more samples or else (I´m not a good >> coder but I have some basic knowledge). >> >> >> On Mon, May 27, 2013 at 2:50 PM, johannes hanika <[email protected]>wrote: >> >>> hm. if anything your sensor is cooler now and has less constant noise >>> added on top. the data in your image matches your previous measurements >>> very closely. i'll have to do some more digging. >>> >>> j. >>> >>> >>> On Mon, May 27, 2013 at 1:46 PM, Baptiste Pierrat < >>> [email protected]> wrote: >>> >>>> Well I did the profiling for my camera and it's currently this one that >>>> is used in the code (git master). I took great care in doing this >>>> correctly, I did 4 profiles and averaged the results. >>>> >>>> Here is the raw file from the previous example if you want to test: >>>> https://www.dropbox.com/s/iqb04gly913vmfx/20130429_0041.ARW >>>> >>>> The problem for me is not only the green pixels but also the bigger >>>> cross-shaped blue and red dots. Isn't that somehow related to the >>>> demosaicing process? >>>> >>>> Thank you for helping with that. >>>> >>>> >>>> >>>> >>>> On Mon, May 27, 2013 at 1:27 PM, johannes hanika <[email protected]>wrote: >>>> >>>>> hm. that looks reasonable. very surprising that those green pixels >>>>> still stay in the color buffer. maybe the profiling doesn't match your >>>>> particular camera model? maybe the profile was a little off for that >>>>> particular iso value, or maybe there is some variance between individual >>>>> sensors for sony cams? >>>>> >>>>> i can try and re-profile that particular raw and see if there are any >>>>> differences to the data we have if you want. >>>>> >>>>> j. >>>>> >>>>> >>>>> On Mon, May 27, 2013 at 12:14 PM, Baptiste Pierrat < >>>>> [email protected]> wrote: >>>>> >>>>>> [image: Inline image 1] >>>>>> >>>>>> >>>>>> On Mon, May 27, 2013 at 12:12 PM, johannes hanika >>>>>> <[email protected]>wrote: >>>>>> >>>>>>> what are the white balance coefficients for that image? >>>>>>> >>>>>>> >>>>>>> On Mon, May 27, 2013 at 11:57 AM, Baptiste Pierrat < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Hello, >>>>>>>> >>>>>>>> I want to second this problem. >>>>>>>> >>>>>>>> I have a Sony Alpha 57 and have a lot of trouble with remaining >>>>>>>> bright color dots after denoising. My usual denoising tools for >>>>>>>> iso>800 are >>>>>>>> : >>>>>>>> 1. Chroma denoise: profiled denoising with wavelets, blend with >>>>>>>> color, then >>>>>>>> 2. Luma denoise: profiled denoising with non-local means, blend >>>>>>>> with lightness >>>>>>>> >>>>>>>> Here is an example with an iso 3200 sample: >>>>>>>> original: http://minus.com/lU783RXDLcLH7 >>>>>>>> chroma denoised: http://minus.com/lBe1kgj6o5aoP >>>>>>>> chroma and luma denoised: http://minus.com/lbqRsDO5q4E617 >>>>>>>> detail after export: http://minus.com/lCLmKR1s2vh5a >>>>>>>> >>>>>>>> Green, red and blue larger dots remain. Also notice as chroma >>>>>>>> denoising does not work well for green color. As suni, this problem is >>>>>>>> partially solved by using the color smoothing option in demosaic but >>>>>>>> the >>>>>>>> image is slightly blurred. >>>>>>>> >>>>>>>> Thanks! >>>>>>>> >>>>>>>> >>>>>>>> On Mon, May 27, 2013 at 11:25 AM, johannes hanika < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> you left in all the luma noise in your lightroom comparison image. >>>>>>>>> to do that in darktable, use `color' blend mode in the profiled >>>>>>>>> denoising >>>>>>>>> module. you may want to use the wavelet method, it is usually a >>>>>>>>> little more >>>>>>>>> effective against color noise. >>>>>>>>> >>>>>>>>> j. >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, May 27, 2013 at 11:21 AM, suni <[email protected]> wrote: >>>>>>>>> >>>>>>>>>> Hi all, >>>>>>>>>> >>>>>>>>>> I'm fighting the high ISO noise of my A550 camera, but I still >>>>>>>>>> cannot achieve the reasonable output. Even the new profiled denoise >>>>>>>>>> filter >>>>>>>>>> doesn't help much. >>>>>>>>>> >>>>>>>>>> Below is the example of the ISO12800 image. I do not take images >>>>>>>>>> on such high ISO but it makes this problem more visible for this >>>>>>>>>> purpose. >>>>>>>>>> This behaviour may be observed even at ISO1600 and higher. The RAW >>>>>>>>>> image >>>>>>>>>> below is totally unaltered RAW for comparison opened side by side in >>>>>>>>>> dt and >>>>>>>>>> in Lt. Only the base curve is applied at dt side because otherwise >>>>>>>>>> the >>>>>>>>>> image looks very ugly and not comparable to the Lt from the visual >>>>>>>>>> point of >>>>>>>>>> view. >>>>>>>>>> >>>>>>>>>> Link to unaltered RAW image: >>>>>>>>>> https://dl.dropboxusercontent.com/u/9454436/sony_noise/raw_not_altered.jpg >>>>>>>>>> >>>>>>>>>> As you can see the image looks almost the same in both tools. >>>>>>>>>> Just note the bright red dots. The Lt shows less of them especially >>>>>>>>>> on the >>>>>>>>>> right side of the paper Christmas tree. These red dots cannot be >>>>>>>>>> removed by >>>>>>>>>> any of the dt denoising filters unless the image becomes almost >>>>>>>>>> blurred. >>>>>>>>>> >>>>>>>>>> Now see the next image below. This shows what can be achieved in >>>>>>>>>> dt and in Lt. While only activating the luma and chroma denoise >>>>>>>>>> sliders in >>>>>>>>>> Lt produces the acceptable and (to me) pretty usable output where >>>>>>>>>> only some >>>>>>>>>> luma noise remains, with dt I cannot achieve similar output by no >>>>>>>>>> means. >>>>>>>>>> The most strange finding is that no one from all the denoising >>>>>>>>>> filters >>>>>>>>>> available in dt can remove these bright red dots unless it is pushed >>>>>>>>>> to not >>>>>>>>>> acceptable high strength producing the blurred image. The only >>>>>>>>>> strategy I >>>>>>>>>> found to be somehow working here is as follows: >>>>>>>>>> 1) turn off the sharpen filter >>>>>>>>>> 2) apply the hot pixel filter at its maximum strength >>>>>>>>>> 3) set the color smoothing of the demosaic filter to maximum >>>>>>>>>> >>>>>>>>>> These three steps do remove the bright red dots. But the image >>>>>>>>>> still suffers of the high chroma noise. The only possible way to get >>>>>>>>>> rid of >>>>>>>>>> it while maintaining the image sharpness at the level comparable to >>>>>>>>>> the Lt >>>>>>>>>> I found is the profiled denoise set to less than default strength. >>>>>>>>>> But as >>>>>>>>>> you can see there still remain far more chroma noise than in the Lt >>>>>>>>>> case. >>>>>>>>>> >>>>>>>>>> Link to altered RAW image: >>>>>>>>>> https://dl.dropboxusercontent.com/u/9454436/sony_noise/raw_altered.jpg >>>>>>>>>> >>>>>>>>>> Because I've got to that point I didn't know what to do more, >>>>>>>>>> I profiled my camera. But even though my profile seems to me to be a >>>>>>>>>> bit >>>>>>>>>> better than the one packed with dt, it produces no visible >>>>>>>>>> difference here. >>>>>>>>>> >>>>>>>>>> I would like to ask all of you experienced in fighting the high >>>>>>>>>> ISO noise for your experiences and recommendations. It would be >>>>>>>>>> great to >>>>>>>>>> get to know that the problem is in between the chair and the >>>>>>>>>> keyboard, not >>>>>>>>>> in the excellent dt tool!:-) >>>>>>>>>> >>>>>>>>>> If someone is interested, the original RAW image can be found >>>>>>>>>> here: >>>>>>>>>> https://dl.dropboxusercontent.com/u/9454436/sony_noise/DSC09533.ARW >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Thank you in advance for any reply! >>>>>>>>>> >>>>>>>>>> Suni >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> ------------------------------------------------------------------------------ >>>>>>>>>> Try New Relic Now & We'll Send You this Cool Shirt >>>>>>>>>> New Relic is the only SaaS-based application performance >>>>>>>>>> monitoring service >>>>>>>>>> that delivers powerful full stack analytics. Optimize and monitor >>>>>>>>>> your >>>>>>>>>> browser, app, & servers with just a few lines of code. Try New >>>>>>>>>> Relic >>>>>>>>>> and get this awesome Nerd Life shirt! >>>>>>>>>> http://p.sf.net/sfu/newrelic_d2d_may >>>>>>>>>> _______________________________________________ >>>>>>>>>> Darktable-users mailing list >>>>>>>>>> [email protected] >>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/darktable-users >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> ------------------------------------------------------------------------------ >>>>>>>>> Try New Relic Now & We'll Send You this Cool Shirt >>>>>>>>> New Relic is the only SaaS-based application performance >>>>>>>>> monitoring service >>>>>>>>> that delivers powerful full stack analytics. Optimize and monitor >>>>>>>>> your >>>>>>>>> browser, app, & servers with just a few lines of code. Try New >>>>>>>>> Relic >>>>>>>>> and get this awesome Nerd Life shirt! >>>>>>>>> http://p.sf.net/sfu/newrelic_d2d_may >>>>>>>>> _______________________________________________ >>>>>>>>> Darktable-users mailing list >>>>>>>>> [email protected] >>>>>>>>> https://lists.sourceforge.net/lists/listinfo/darktable-users >>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> > > > ------------------------------------------------------------------------------ > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may > _______________________________________________ > Darktable-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/darktable-users > > -- Panta Rhei -- Life is a dance
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