[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 >>> >>> >> >
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