Le 26/02/2014 22:14, Alexandre Jullien a écrit : > Hi, > > I don't have LR (as I have only linux...) but indeed it is clear that > LR is doing the best job for noise reduction. > I'm also very interested is somebody knows how to treat the noise with > the same results as LR. >
I don't have access to lightroom. I've seen Dxo Optics Pro and it seemed to do a good job (but that requires Windows or Mac, too, which I avoid). What I often do is apply stronger noise reduction in darkest areas of images. For example, I apply a denoising filter (either profiled, non-local means or bilateral filter, sometimes an extra instance of an already existing one) with high strength (for example profiled, in wavelet mode, strengh 3 to 4). It reduces the noise very strongly but loses much details. Then I turn blend to "parametric mask", choose the L tab and adjust the output (not input) blending area. So it means for example strong denoising fully applied when output L is between 0 and 10, then gradually fading from 10 to 15, then not applied at all. You can use the picker tool to help you figure out values from areas of the photograph. Output L is after applying the filter, it allows to makes a smooth, natural transition. This way, I get very good denoising in dark areas when signal-to-noise ratio is low (with loss of details there that are often not important), while keeping details in all other areas of image. Congratulations to darktable authors ! ------------------------------------------------------------------------------ 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
