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 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.
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 ☺
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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