On Mon, Dec 16, 2013 at 2:03 PM, Rob Z. Smith <[email protected]> wrote:
> Have you tried the profiled denoise with either a simple reduction in
> strength or applied with a brightness ramp through the parametric stuff
> Halgeir? I have one of the older Pentax cameras that (unlike the current
> range) has a fair bit of noise at high ISO and like you find the profiled
> denoise a bit much at high ISO although brilliant at normal values – just
> a bit of blending works a treat with it though and I generally only go to
> NLM
>
fwiw, the core algorithm in `denoise profiled' in nlm mode and in the
standalone nlm module is the same.
> or bilateral NR for special cases.
>
>
>
> While we are on the subject of denoise - if I could choose something for
> my Xmas list it would be for dt to keep track of how much each pixel (or
> area) of the screen has been boosted in brightness by the various modules
> and then offer denoise (or a mask) based on the effective ISO we have
> raised those pixels to.
>
that's why noise reduction is done before all the modules mess with your
data.
-jo
> I don’t know if that would be practical but it would be really, really
> nice and save a lot of faff manually finding denoise selection parameters
> to match the effects we have used. What we already have is fantastic
> though so I’m just being greedy J
>
>
>
> Rgds,
>
> Rob.
>
>
>
> *From:* Halgeir Kjønås Rennehvammen [mailto:[email protected]]
> *Sent:* 16 December 2013 12:40
> *To:* darktable-devel
> *Subject:* Re: [darktable-devel] white dots hight ISO
>
>
>
> Denoise (profile) removes to much details for my taste so I have to use
> denoise (non local means) and the equalizer
> to get best results.
>
> To follow up the case further. The problem is on raw images from noisy
> cameras like Canon 7D on high iso levels.
> Give me a couple of days and I will dig in my archive and find those
> problematic raw images, if I still have those shots.
>
> Basically the problem was in images with iso 3200 and greater.
>
> On other camera systemes with a different sensor like Pentax, Sony og
> Nikon this is a non existing problem.
> Canon sensor don't handle noise very well and the raw files is a pain to
> process i Dt.
>
> )-|algeir
>
> Den 16. des. 2013 10:42, skrev Benjamin Lefaudeux:
>
> 'Hot pixels' is exactly an 'impulse noise reduction' filter, you can
> lower the threshold if it doesn't fit your needs. Apart from that, you only
> have to use the 'Denoise profiled' (which as something like 2 useful
> sliders, and often works out of the box), so I don't quite see why the
> situation is so different from LR. I don't realy see the point in
> introducing yet another noise reduction module.
>
> Benjamin
>
>
>
>
>
> developers a message.
> And yes I have tried before. The message is clear. Dt have to improve in
> this field.
> And yes also I have also tried to use 'hot pixels' module several times
> but it don't always work.
>
> I hope that some of you have experience with other raw processor. But
> this is the situation.
> Lr have none of these problems and do a perfectly job with only 4
> sliders. Rawtherapee solves
> this by 6 sliders in noise reduction and the white dots are removed by
> Impulse Noise Reduction
> filter. Both raw processor do a perfect job.
>
> The most easy solution in my opinion is to add a Impulse Noise Reduction
> alike tool.
>
> )-|algeir
>
>
>
> Den 15. des. 2013 16:11, skrev Moritz Moeller:
>
> > On 15/12/13 4:01 pm, Bruno Moro wrote:
> >> Compliments. Darktable is an excellent software and my favorite for raw
> >> images of my camera. I just feel the need for a plugin similar to the
> >> G-MICpixel-noise to reduce number of white dots in the images at high
> ISO.
> >> Is there something similar in Darktable?
> > Have you tried the 'hot pixels' module? I btw. think this question is
> > for darktable-users, not darktable-devel?
> >
> > .mm
> >
> >
> >
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