Hi Rob, thank you for your reply and advice. I saw already the mention video and all your others, they are great. In the screenshot 'DT with base curve, sharpen and denoise profiled (wavelets 0.3 HSV-Color and none local means 0.45 HSV-luminance).png' I tried this approach with the best results I could get.
Best regards, Christian Am 2014-02-27 10:58, schrieb Robert William Hutton: > On 26/02/14 21:00, Christian Sinn wrote: >> I did a denoise comparison of darktable (DT) with rawtherapee (RT) and >> lightroom (LR) because my photos shoot with ISO 1600 are very noisy and >> I found no way for a satisfying result. > I use a dual denoise approach, as recommended in the manual, using Denoise > (profiled): > > "This module can eliminate noise with two different core algorithms. > “non-local means” is a bit better suited to tackle > luma (lightness) noise; “ wavelet” has its strength in eliminating chroma > (color) noise. If needed you can apply two > instances of this module (see Section 3.2.3, “Multiple instances”). The > “non-local means” instance should be combined > with blend mode “lightness” or “HSV lightness”; the “wavelet” instance with > blend mode “color” or “HSV color”." > > http://www.darktable.org/usermanual/ch03s04s04.html.php#denoise_profiled > > So basically I do: > * wavelets, strength 1, blend mode color. > * non-local means, strength 0.5, blend mode lightness. > > You can also have a look at the video I did on the denoise tools in > darktable, though I compare darktable to AfterShot > Pro with NoiseNinja. > > https://www.youtube.com/watch?v=4nBzAeM0tpI&list=PLmvlUro_Up1NBX7VK8UUuyWo1B468zEA0&index=4 > > Also, from a previous email from Johannes to this list: > > "the profiled denoising is based on assumptions (the noise model) which break > down in dark areas for quite a few > cameras. in my experience images with dark background and piecewise-constant > characteristics, the non-local means > denoising module can work better (starry skies, probably fireworks, too). in > case you want more fine grained control > over the wavelet shrinkage used in profiled denoising in wavelet mode, it's > basically the same method as employed in the > equalizer. it's also a good idea to try color-only blend modes (hsv color, as > described here > http://www.darktable.org/usermanual/ch03s04s04.html.php#denoise_profiled)." > > By the way, "wavelet shrinkage" is controlled by the "sharpness" tab of the > equalizer. More on that in (you guessed it) > another one of my videos: > > https://www.youtube.com/watch?v=zzVXK4eAM5E&list=PLmvlUro_Up1NBX7VK8UUuyWo1B468zEA0&index=16 > > Hope that helps. > > Regards, > > Rob > > ------------------------------------------------------------------------------ > Flow-based real-time traffic analytics software. Cisco certified tool. > Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer > Customize your own dashboards, set traffic alerts and generate reports. > Network behavioral analysis & security monitoring. All-in-one tool. > http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk > _______________________________________________ > Darktable-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/darktable-users > ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
