Thanks for your reply Robert. I'm a subscriber of your youtube channel. Seen all your DT videos. Great work! Thanks!
In my experience, usually the module defaults work pretty great. My main concern with denoise(profiled) is that, removing only chroma noise, it actually increases the noise. That can't be normal. Even more so since i'm using the approach recommended in the user manual, two instances with different blending modes. I'm watching the issue Istvan mentioned in the previous email to see where that goes. In the meantime i'm definitely looking for workarounds. It'a a shame because that module, in theory, is the holy grail of noise reduction :) Best regards. Gonçalo Marrafa On 17 August 2015 at 01:45, Robert William Hutton <r...@helms-deep.net> wrote: > Hi Gonçalo, > > You need to reduce the strengths. Right now you're destroying far too > much detail with the two instances at full strength. I normally start with > strength 0.75 on the wavelet/colour instance and strength 0.5 on the > non-local means/lightness instance and then *go down from there*. I often > end up with strengths around 0.5 on the colour and .3 on the lightness, but > this depends on the image and on taste. It can also depend on the > destination for the image (facebook vs print etc.). > > I also like to try increasing the number of rounds of colour smoothing in > the demosaic module for really stubborn green blotches (though these > normally only appear in very high ISOs for me). > > https://www.darktable.org/usermanual/ch03s04.html.php#demosaic > > Also worth checking out is the denoising in the equalizer module (i.e. the > bottom splines in the colour/). Have a look at some of the presets to get > an idea how this works. I find for really heavily noisy images or images > that have had their exposure pushed a lot, this can be more effective. > > https://www.darktable.org/usermanual/ch03s04s04.html.php#equalizer > > It might also be worth checking out my denoising video, though it's > getting a bit old now: > > > https://www.youtube.com/watch?v=4nBzAeM0tpI&index=3&list=PLmvlUro_Up1NBX7VK8UUuyWo1B468zEA0 > > Cheers, > > Rob > > > On 15/08/15 08:44, Gonçalo Marrafa wrote: > >> Hi all. >> >> I'm having some problems with the denoise(profiled) modules. I tried >> using the simple default module >> settings and the two instance approach described in the manual but i >> don't get better results using >> two instances. In fact i think it's quite the contrary. >> >> I've created a set of screenshots showing different results of different >> combinations of module >> settings on an image. They go from no noise reduction at all to simple >> default settings then having >> and instance for removing only choma noise, one for luma noise and then >> both. >> >> As an example, removing only chroma noise seems create even more noise. >> There's also a noticeable >> difference between HSV blending modes and "normal" ones. Shouldn't the >> HSV ones look nicer? Don't >> seem to... >> >> Am i missing something? Doing something wrong? >> >> The image was taken on a Nikon D7100 with the 18-105mm lens at ISO 1600. >> It has no other processing, >> except the default applied modules. >> >> You can look at the images here: https://goo.gl/gmkxMY >> >> Thanks in advance. >> >> >> Gonçalo Marrafa >> >> >> >> ------------------------------------------------------------------------------ >> >> >> >> _______________________________________________ >> Darktable-users mailing list >> Darktable-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/darktable-users >> >>
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