Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

On Thu, 8 Dec 2016 13:47:31 -0800, "I. Ivanov" 
wrote :

> Denoise_chinese is very impressive, thank you!
> 
> I tried on 6400 ISO image and it works better than anything I used
> before.
> 

What is also surprising is that it doesn't use the noise profile at
all...

However it doesn't work as well on all pictures.
I've tried on another high iso picture and this time the result is
clearly inferior to LightRoom/RawTherapee.

The advantage of LightRoom/RawTherapee is that you have only 2 sliders
to control the denoise, so it's quite easy to adapt the denoise to the
picture

With denoise_chinese, it's much more complicated to tweak the
parameters.

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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

On Thu, 8 Dec 2016 18:44:30 +0100, Saint Germain <saint...@gmail.com>
wrote :

> On Thu, 8 Dec 2016 15:14:02 +1100, Gary Parkinson
> <gpar3...@bigpond.net.au> wrote :
> 
> > Try using the Darktable style "Denoise_chinese"
> > 
> > https://dtstyle.net/
> > 
> 
> This is actually quite nice !
> Here is the result I have got without touching anything:
> ttp://dl.free.fr/jisaMUzIg
> 
> We still have a slight luminance problem, but I think we are on the
> right track.
> 
> Thanks a lot

I managed to get (without too much effort) a quite good result about
the noise (xmp+jpg):
http://dl.free.fr/sn4ZBHVlY
http://dl.free.fr/b1UIskws2

Combination of "Denoise_chinese" + "RAW denoise".

It seems that it is even slightly better than LightRoom and
RawTherapee !

Now I have to correct the color and exposure (the color seems to be OK
now but the image is too dark, but when I increase the exposure, the
colors become wrong, something strange is going on).

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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

I received a png.xmp file ?
Have you started from the raw (.srw) file ?
If yes I think it should be a .srw.xmp file...

Except if there is something I have misunderstood ?

On Thu, 8 Dec 2016 10:33:48 -0800, Jack Bowling <jbi...@shaw.ca> wrote :

> As requested. here is an xmp of a screenshot of a 100% view of the 
> magazine image of the two women. Nothing complex. Image itself not 
> attached due to size. If you wish, I could send it offlist.
> 
> Jack
> 
> 
> On 12/08/2016 09:18 AM, Saint Germain wrote:
> > Indeed lensfun doesn't have this lens in its database yet.
> > After the noise profile, it's my next task to create the entry for
> > this particular lens.
> >
> > Can you provide the xmp of your modifications to see exactly what
> > you have done ?
> 
> 
> 
> 
> darktable user mailing list
> to unsubscribe send a mail to
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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

Hi,

I am really not sure to be able to duplicate what you said.
Could you provide perhaps an example (RAW+xmp) ?

Thanks a lot

On Thu, 8 Dec 2016 07:10:28 +0100, KOVÁCS István
<k...@kovacs-telekes.org> wrote :

> Hi,
> (Second attempt, sorry if you get a duplicate.)
> 
> For very high ISO, i usually enable colour smoothing under demosaic
> settings, apply profiled denoising for colours (wavelet mode with
> colour blending mode, heavy denoising settings), avoid all
> sharpening, and, if the situation is really bad, apply a pinch of raw
> denoising. Still, I find that RawTherapee is better in this respect.
> Sometimes I skip denoising in darktable and use NoiseNinja, an old
> commercial denoising app that has a Linux version (BTW, PictureCode,
> developers of NoiseNinja, now produce a nice little raw developer
> called PhotoNinja, which you can get to run under wine).
> 
> Regarding colours, darktable often ships with two profiles for a
> camera, called standard and enhanced. You can try both, and if you
> don't like either, you can profile your camera, or try RawStudio's
> profiles (if they have one). Expect a drop in processing speed with
> RawStudio profiles, though.
> 
> Kofa
> 
> On 8 Dec 2016 00:45, "Saint Germain" <saint...@gmail.com> wrote:
> 
> > Hello,
> >
> > I just bought a Samsung NX1 and would like to use Darktable to
> > process the RAW (SRW).
> >
> > However I really tried but I couldn't manage to get correct colors
> > or to have a good noise reduction in high iso situation (low light).
> >
> > I've tried LightRoom and RawTherapee and I managed (without knowing
> > these softwares) to get quite good results in under 5-10 minutes.
> > So far I think I've spent several hours with Darktable...
> >
> > I would really like to stay with Darktable (as I find the interface
> > quite pleasant and it offers a lot of useful features) but I really
> > need to have good colors and good noise reduction (at least
> > comparable to LR and RT) without too much tinkering.
> >
> > From what I have heard, it seems that Darktable noise reduction is
> > very powerful and actually superior to LR or RT. Basic noise
> > reduction in LR or RT is very simple : 2 sliders and that's it
> > (Luminance and Details). However it is quite effective, and I
> > haven't been able to do better with Darktable (and it took me much
> > more time, I even made a noise profile !).
> >
> > Perhaps am I doing something wrong ?
> > Can someone guide me or show me how to proceed ?
> >
> > Original JPEG + RAW
> > http://dl.free.fr/fBpM8C6I1
> > http://dl.free.fr/jB13bvffN
> >
> > Rawtherapee (JPEG + pp3)
> > http://dl.free.fr/vT4rAtm5O
> > http://dl.free.fr/fJEcA3gH9
> >
> > Lightroom (JPEG)
> > http://dl.free.fr/nEEcDqtq0
> >
> > Darktable Noise profile
> > http://dl.free.fr/sZ8hCADDw
> >
> > Darktable (JPEG + xmp)
> > http://dl.free.fr/fJQSonH7n
> > http://dl.free.fr/knQbw4QMl
> >
> > Thanks a lot in advance,
> > 
> > 
> > darktable user mailing list
> > to unsubscribe send a mail to darktable-user+unsubscribe@
> > lists.darktable.org
> >
> >
> 
> 
> darktable user mailing list
> to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org

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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

On Thu, 8 Dec 2016 15:14:02 +1100, Gary Parkinson
 wrote :

> Try using the Darktable style "Denoise_chinese"
> 
> https://dtstyle.net/
> 

This is actually quite nice !
Here is the result I have got without touching anything:
ttp://dl.free.fr/jisaMUzIg

We still have a slight luminance problem, but I think we are on the
right track.

Thanks a lot

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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

Indeed lensfun doesn't have this lens in its database yet.
After the noise profile, it's my next task to create the entry for this
particular lens.

Can you provide the xmp of your modifications to see exactly what you
have done ?

Thanks

On Wed, 7 Dec 2016 23:54:08 -0800, Jack Bowling <jbi...@shaw.ca> wrote :

> I got usable results on the old woman/young woman poster shot by
> using:
> 
> 1) two invocations of the equalizer - one using the denoise preset
> but increased to a mix of 1.25, and the other using the sharpness
> preset with a mix of 1.0
> 
> 2) very slight touch of raw denoise
> 
> 3) enabled defringe module at defaults
> 
> 4) increased sharpen module (unsharp mask) a touch.
> 
> I note the lens correction module does nothing for this image despite 
> the obvious barrel distortion. I suppose lensfun does not support
> this lens? One thing I did not do is raise the exposure which would
> only increase the noise substantially.
> 
> Having said all that, everybody has their own threshold of detail
> versus smoothing when denoising.
> 
> Jack
> 
> 
> On 12/07/2016 10:10 PM, KOVÁCS István wrote:
> > Hi,
> > (Second attempt, sorry if you get a duplicate.)
> >
> > For very high ISO, i usually enable colour smoothing under demosaic
> > settings, apply profiled denoising for colours (wavelet mode with
> > colour blending mode, heavy denoising settings), avoid all
> > sharpening, and, if the situation is really bad, apply a pinch of
> > raw denoising. Still, I find that RawTherapee is better in this
> > respect. Sometimes I skip denoising in darktable and use
> > NoiseNinja, an old commercial denoising app that has a Linux
> > version (BTW, PictureCode, developers of NoiseNinja, now produce a
> > nice little raw developer called PhotoNinja, which you can get to
> > run under wine).
> >
> > Regarding colours, darktable often ships with two profiles for a
> > camera, called standard and enhanced. You can try both, and if you
> > don't like either, you can profile your camera, or try RawStudio's
> > profiles (if they have one). Expect a drop in processing speed with
> > RawStudio profiles, though.
> >
> > Kofa
> >
> > On 8 Dec 2016 00:45, "Saint Germain" <saint...@gmail.com
> > <mailto:saint...@gmail.com>> wrote:
> >
> > Hello,
> >
> > I just bought a Samsung NX1 and would like to use Darktable to
> > process the RAW (SRW).
> >
> > However I really tried but I couldn't manage to get correct
> > colors or to have a good noise reduction in high iso situation (low
> > light).
> >
> > I've tried LightRoom and RawTherapee and I managed (without
> > knowing these softwares) to get quite good results in under 5-10
> > minutes. So far I think I've spent several hours with Darktable...
> >
> > I would really like to stay with Darktable (as I find the
> > interface quite pleasant and it offers a lot of useful features)
> > but I really need to have good colors and good noise reduction (at
> > least comparable to LR and RT) without too much tinkering.
> >
> > >From what I have heard, it seems that Darktable noise
> > >reduction is
> > very powerful and actually superior to LR or RT. Basic noise
> > reduction in LR or RT is very simple : 2 sliders and that's it
> > (Luminance and Details). However it is quite effective, and I
> > haven't been able to do better with Darktable (and it took me much
> > more time, I even made a noise profile !).
> >
> > Perhaps am I doing something wrong ?
> > Can someone guide me or show me how to proceed ?
> >
> > Original JPEG + RAW
> > http://dl.free.fr/fBpM8C6I1
> > http://dl.free.fr/jB13bvffN
> >
> > Rawtherapee (JPEG + pp3)
> > http://dl.free.fr/vT4rAtm5O
> > http://dl.free.fr/fJEcA3gH9
> >
> > Lightroom (JPEG)
> > http://dl.free.fr/nEEcDqtq0
> >
> > Darktable Noise profile
> > http://dl.free.fr/sZ8hCADDw
> >
> > Darktable (JPEG + xmp)
> > http://dl.free.fr/fJQSonH7n
> > http://dl.free.fr/knQbw4QMl
> >
> > Thanks a lot in advance,
> > 
> > 
> > darktable user mailing list
> > to unsubscribe send a mail to
> > darktable-user+unsubscr...@lists.darktable.org
> > <mailto:darktable-user%2bunsubscr...@lists.darktable.org>
> >
> >
> > 
> > darktable user mailing list to unsubscribe send a mail to
> > darktable-user+unsubscr...@lists.darktable.org
> 
> 
> darktable user mailing list
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> 

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Re: [darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

On Thu, 8 Dec 2016 13:28:22 +0100, johannes hanika 
wrote :

> hi pascal,
> 
> On Thu, Dec 8, 2016 at 11:20 AM, Pascal Obry  wrote:
> > Jo,
> >
> > The profile (.json) is provided by the author in its original
> > message.
> 
> oh, thanks, i did indeed miss that. but it only contains a profile for
> iso 25600? not for the 3200 the shot was taken at?
> 

Indeed I uploaded a false noise profile, here is the correct one:
http://dl.free.fr/bNDlCNHWH

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[darktable-user] Weird colors and difficult noise reduction compared to LightRoom or RawTherapee

[Saint Germain]

Hello,

I just bought a Samsung NX1 and would like to use Darktable to process
the RAW (SRW).

However I really tried but I couldn't manage to get correct colors or
to have a good noise reduction in high iso situation (low light).

I've tried LightRoom and RawTherapee and I managed (without knowing
these softwares) to get quite good results in under 5-10 minutes.
So far I think I've spent several hours with Darktable...

I would really like to stay with Darktable (as I find the interface
quite pleasant and it offers a lot of useful features) but I really
need to have good colors and good noise reduction (at least comparable
to LR and RT) without too much tinkering.

From what I have heard, it seems that Darktable noise reduction is
very powerful and actually superior to LR or RT. Basic noise reduction
in LR or RT is very simple : 2 sliders and that's it (Luminance and
Details). However it is quite effective, and I haven't been able to do
better with Darktable (and it took me much more time, I even made a
noise profile !).

Perhaps am I doing something wrong ?
Can someone guide me or show me how to proceed ?

Original JPEG + RAW
http://dl.free.fr/fBpM8C6I1
http://dl.free.fr/jB13bvffN

Rawtherapee (JPEG + pp3)
http://dl.free.fr/vT4rAtm5O
http://dl.free.fr/fJEcA3gH9

Lightroom (JPEG)
http://dl.free.fr/nEEcDqtq0

Darktable Noise profile
http://dl.free.fr/sZ8hCADDw

Darktable (JPEG + xmp)
http://dl.free.fr/fJQSonH7n
http://dl.free.fr/knQbw4QMl

Thanks a lot in advance,

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Re: [darktable-user] Almost perfect colors with Nikon D7200 and Darktable

[Saint Germain]

On Fri, 28 Oct 2016 09:52:40 +0200 (CEST), "Tomas Sobek"
 wrote :


> "I was also unsatisfied with the rendered color with my D7200 and I
> also bought the IT8 target and the Colormunki Display to try to
> correct them. "
> 
> 
> Having calibrated your monitor is a good start. This way you should
> see on screen a reasonable representation of your image, similar to
> how other people with calibrated screens will see it.
> 
> 
> 
> As for the camera input profile, I was often tweaking green tint in
> white balance settings in the past. This was my primary motivation,
> to see if I can get a better starting point with less work. I used
> the profiles I shared on a few occasions (all outdoors) and they seem
> to be working reasonably well for me. If I were to shoot in difficult
> light situation, I carry with me ColourChecker Passport and I would
> take a shot of it in that specific light. Then create a profile
> specific to this situation as I described in this article
> (https://tomassobekphotography.co.nz/articles/create-camera-input-profile-with-ColorChecker-Passport.php)
> - Once you have things setup, it only takes a few minutes.
> 
> 
> "Are you using your color profile on top of a base curve ?"
> I am using the camera input profile only to alter relationships
> between colours (hence using Linear Rec709 RGB input/output profiles
> when processing target shot during the profile creation). I still
> apply base curve and all the other adjustments to produce an image I
> like. With landscape photography there is a lot of scope to balance
> dark and bright parts of the image (graduated density filter for
> bright sky for example). Another of my favourites is zone system, or
> subtle tweaks with levels on parts of the image (I learned that
> technique from this ebook
> (https://resources.digital-photography-school.com/download/landscapes-book/)
> ).
> 
> "For example:
> - JPG: http://dl.free.fr/oveYkaeh3
> - NEF: http://dl.free.fr/g2xLlF4lQ
> 
> ""In the above example, pay attention to the white wall on the left
> and the color of the head of the bed (light brown).
> I haven't managed to correct the colors in order to have something
> like the JPEG (which gives the correct color as I see it with my own
> eyes). "
> I tried a quick edit of your image to get reasonably close (without
> being pedantic) to the Jpeg from camera. I have included both
> resulting Jpeg and xmp file here
> - https://www.dropbox.com/s/1nzicnmuaazhule/DSC_4860.zip?dl=0
> (https://www.dropbox.com/s/1nzicnmuaazhule/DSC_4860.zip?dl=0) -
> Primarily I used spot white balance on lighter grey patches of IT8
> target, then turned colour temperature a bit down. Increase exposure.
> A bit less saturation and some noise reduction; at ISO 2000 the image
> seems to have a lot of noise to my liking. Your lens wasn't
> recognised on my system so I couldn't apply lens correction.
> 
> I hope you find my comments useful. But I don't claim to have much 
> experience - I am just learning as I go ;)
> Cheers, Tomas
> 

Thanks for the attempt !
However my point was that I couldn't make such effort for each picture
as it is consuming too much time (especially when the JPEG gives
accurate color directly).
I was (naively) hoping that I could find a 'generic' processing with
Darktable which can be applicable on all NEF and gives 'good enough'
result, but that it is simply not working.
For many pictures, I find myself having to individually work on them
and I simply don't have the time and motivation.

So I ended up just working with the Nikon JPEG and only in some extreme
cases, I am using Darktable.

I'm even considering changing my camera to have one which gives better
default results in Darktable !

Best regards,

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Re: [darktable-user] Almost perfect colors with Nikon D7200 and Darktable

[Saint Germain]

On Thu, 27 Oct 2016 08:04:14 +0200 (CEST), "Tomas Sobek"
 wrote :

> Hi,
> Just in case anyone is still interested in this thread, I have
> written up some thoughts and experiences with creating camera input
> profiles:
> 
> * My version of the procedure as per video below, but with newer
> Darktable version. Also ensuring the colour profiles created are well
> behaved (see
> http://ninedegreesbelow.com/photography/well-behaved-profile.html ).
> * Experiences from following Elle Stone's great tutorial (see
> http://ninedegreesbelow.com/photography/well-behaved-camera-profile.html
> ).
> * Couple of my Nikon D7100 profiles for download.
> 
> My articles are available here -
> https://tomassobekphotography.co.nz/articles.php Please let me know
> if you notice any inaccuracies. Cheers, Tomas
> 

Hello,

Thanks for the info.
I see that we had a similar approach.
I was also unsatisfied with the rendered color with my D7200 and I also
bought the IT8 target and the Colormunki Display to try to correct them.

I have more or less given up on the issue and adopted this approach:
https://www.mail-archive.com/darktable-user@lists.darktable.org/msg01213.html

As D7100 and D7200 are more or less the same, I've tried your color
input profiles but I haven't managed to get any improvement with my
difficult shots (inside shot mainly).

For example:
  - JPG: http://dl.free.fr/oveYkaeh3
  - NEF: http://dl.free.fr/g2xLlF4lQ

In the above example, pay attention to the white wall on the left and
the color of the head of the bed (light brown).
I haven't managed to correct the colors in order to have something like
the JPEG (which gives the correct color as I see it with my own eyes).

Are you using your color profile on top of a base curve ?

Thanks for your interesting article and for this message.
I feel a little less alone !


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[darktable-user] Advice on workflow

[Saint Germain]

Hello,

After struggling a lot with my Nikon D7200 and Darktable (the default
color rendition of RAW with Darktable is sometimes really off), I gave
up on processing all RAW systematically.
Indeed the default JPEG given by the camera is good enough for most
purposes (at least for me and my family).

So I would like to implement the following workflow:
1) review each JPEG picture and:
  a) if the JPEG is good enough, do nothing
  b) if the JPEG need to be reframed, do it on the JPEG directly
  c) if the the RAW need to be used, do the modifications on the RAW
2) At the end, select the JPEG which have been modified by 1a) and the
RAW which have been modified by 1c) and export them in JPEG format.

What would be the "darktable" way to do it ?

For the moment I proceed like this:
1) import the directory (RAW + JPEG)
2) go to the darkroom
3) double-click on the JPEG thumbnails below (because if I use the space
bar, the next picture selected will be the RAW)
4) if only reframe is needed, I reframe the JPEG and mark with 5-stars
5) if heavier modifications are needed, I double-click on the RAW
thumbnail, modify the RAW and mark the RAW with 5-stars
6) At the end, I select all 5-stars pictures and export them in JPEG.

It works, but the whole marking with the 5-stars is a bit cumbersome
(and it is easy to forget to do it).
I thought there should be another "darktable" way to do it but I don't
know how.

Can someone recommend a better workflow ?

Thanks a lot

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Re: [darktable-user] Almost perfect colors with Nikon D7200 and Darktable

[Saint Germain]

Tried looking at the skin tone of people.
In my case it is a bit too reddish/pinkish in a lot of situations (but
not every situation).

On Thu, 18 Aug 2016 18:51:15 +, Colin Adams
<colinpaulad...@gmail.com> wrote :

> But if I use Nikon D810 base curve instead of neutral, I get a
> pleasing effect also. Decidedly vivid though.
> 
> On Thu, 18 Aug 2016 at 19:48 Colin Adams <colinpaulad...@gmail.com>
> wrote:
> 
> > Hm. I get a nice result with neutral base curve and rgb rec 2020
> > linear too.
> >
> > On Thu, 18 Aug 2016 at 19:25 Saint Germain <saint...@gmail.com>
> > wrote:
> >
> >> On Thu, 18 Aug 2016 15:26:53 +, Colin Adams
> >> <colinpaulad...@gmail.com> wrote :
> >>
> >> > Perhaps making a custom camera input profile, as detailed at
> >> >
> >> http://ninedegreesbelow.com/photography/camera-profile-make-target-shot.html
> >> > is worth pursuing?
> >> >
> >>
> >> I already tried this approach with tht IT8 target:
> >> https://github.com/pmjdebruijn/colormatch
> >> It is more or less the same as the one described on Darktable
> >> website:
> >>
> >> https://www.darktable.org/2016/05/colour-manipulation-with-the-colour-checker-lut-module/
> >>
> >> The result always has the green tint on it.
> >>
> >> 
> >> darktable user mailing list
> >> to unsubscribe send a mail to
> >> darktable-user+unsubscr...@lists.darktable.org
> >>
> >>

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Re: [darktable-user] Almost perfect colors with Nikon D7200 and Darktable

[Saint Germain]

On Mon, 15 Aug 2016 11:41:36 +0200, Matthieu Moy
<matthieu@grenoble-inp.fr> wrote :

> Saint Germain <saint...@gmail.com> writes:
> 
> > Hello,
> >
> > Please see the thread about Nikon and Darktable there:
> > https://www.mail-archive.com/darktable-user@lists.darktable.org/msg00805.html
> 
> Thanks, I missed this thread indeed.
> 
> > I managed to get quite good result with my D7200 with the Nikon
> > input color profile for D7100 given in this thread.
> 
> That's surprising: on some images the D7100 color profile gives good
> results at least color-wise, but in many cases it also flattens
> completely the contrast. I could get a close-to-camera JPEG result by
> drawing a slightly S-shape base curve manually for one picture, but
> then it's completely wrong on another one. So, I still don't have a
> "one fits all" receipe :-(.

Indeed I am also looking for the single recipe which will allow me to
have a defaut satisfying behavior.
So far I can say that the JPEG given by Nikon gives a satisfying result
(far from perfect but acceptable). With Darktable and the different
presets I have tried, I always have to modify something manually,
which is taking me too much time.

I have to emphasize again, that I am NOT especially trying to duplicate
Nikon JPEG. It's just that it gives an acceptable result and it serves
as a point of reference (especially for color tone) in order to achieve
at least a similar result with Darktable (because I always have a
blueish/greenish tint so far).

With the trick to use the .icm profile generated by ViewNX 2/Capture
NX-D, I agree that the result is a bit "flat" (but with almost correct
colors). I can of course modify it, but this modification cannot be
used on another pictures (same problem as you).

Can I offer to try to work on the same set of pictures ?
I already uploaded an example here (see last comment) :
https://redmine.darktable.org/issues/11053#note-11
Perhaps can you also upload somewhere the pictures which are difficult
to process by Darktable ?

> 
> > Can you generate and upload a .dtstyle that give you good result ?
> 
> Attached is an XMP file.
> 
> 

This style gives me a rather incorrect result in the example I have
provided.

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Re: [darktable-user] A better starting-point for Nikon RAW-files

[Saint Germain]

Hello,

I've tried your profiles with my D7200, and I can confirm that the
results are much closer to the camera jpeg.
I can see a slight blue/green cast and the colors are less
saturated, but it's a much better starting point than the base curve.

I'll have to generate my own profiles to be sure (perhaps D7200 is a
bit different from D7100 ?).

Thanks to Edgardo and Vidar !

On Mon, 1 Aug 2016 15:10:22 -0300, Edgardo Hoszowski
 wrote :

> Sure, see attached
> 
> 
> 2016-08-01 5:46 GMT-03:00 Rafa García :
> 
> > Hi Edgardo,
> >
> >   I wrote you related about 7100 icc profiles. I have a mac updated
> > to capitan and I couldn't install view NX 2 to generate the
> > profiles.
> >
> >   Could you send me your 7100 generated profiles?
> >
> > Thanks!
> >
> >
> >
> > 2016-07-31 19:13 GMT+02:00 Edgardo Hoszowski
> >  :
> >
> >> Same here with a D5100, with a D7100 all went fine, I have 2 or 3
> >> different profiles that give different colors cast, but so far
> >> there's always one closer to the camera jpg.
> >> Using the D7100 profiles on a D5100 raw seems ok too,  much closer
> >> to the camera jpg.
> >>
> >>
> >> 2016-07-31 8:18 GMT-03:00 Colin Adams :
> >>
> >>> So I tried this (I have a Nikon D810).
> >>>
> >>> When selecting any of the generated icc profiles except the last
> >>> one, I get a message:
> >>> "unsupported input profile has been replaced by linear Rec709
> >>> RGB!" So I selected the last one, and set unbreak input profile
> >>> to 0.0 as you instruct.
> >>> The resulting image indeed looks to have slightly better quality,
> >>> but it has a green cast.
> >>> This is with darktable 2.0.5-1 rather than 2.0.4. I'm doubtful if
> >>> that should be making the difference though.
> >>>
> >>> On Wed, 27 Jul 2016 at 15:39 Jean-Luc CECCOLI <
> >>> jean-luc.cecc...@wanadoo.fr> wrote:
> >>>
>  Hello,
> 
> 
> 
>  Very interesting.
> 
>  Thanks for sharing.
> 
> 
> 
>  Rgds,
> 
> 
> 
>  J.-Luc
> 
> 
> 
> 
> 
>  > Message du 26/07/16 20:41
>  > De : "Vidar Hoel" 
>  > A : "Jean-Luc CECCOLI" ,
>  darktable-user@lists.darktable.org
>  > Copie à :
>  > Objet : Re: [darktable-user] A better starting-point for Nikon
>  RAW-files
> 
> 
>  >
>  > On 26. juli 2016 20:16, Jean-Luc CECCOLI wrote:
>  > > Hello,
>  >
>  > Hi!
>  >
>  > > Just one thing that puzzles me : Nikon ViewNX2 generates a
>  > > profile
>  for
>  > > each picture it processes, so each
>  > > profile is based upon the parameters of this picture.
>  >
>  > Almost. It generates a different profile for each camera
>  > setting (it seems like). So of mine 98 pictures, I got 10
>  > different profiles.
>  >
>  > > That would mean that, for each picture, one would have to
>  > > use the corresponding imported profile, else one
>  > > might get even worse results than using the DT dedicated
>  > > basecurve, isn't it ?
>  >
>  > After applying all 10 different profiles to the same image, I
>  discovered
>  > it was only minor differences, and so small I can neglect
>  > them. I
>  have
>  > never seen them make a worse result than the dedicated base
>  > curves.
>  But
>  > this is a subjective observation!
>  >
>  > Regards,
>  > Vidar Hoel
>  >
>  > > That said, I think that that is the way profiles work...
>  > >
>  > >
>  > >
>  > > Regards,
>  > >
>  > >
>  > >
>  > > J.-Luc
>  > >
>  > >
>  > >
>  > >
>  > >
>  > > > Message du 26/07/16 18:45
>  > > > De : "Vidar Hoel" 
>  > > > A : darktable-user@lists.darktable.org
>  > > > Copie à :
>  > > > Objet : [darktable-user] A better starting-point for Nikon
>  RAW-files
>  > > >
>  > > > Hi,
>  > > >
>  > > > some time ago I noticed that the JPGs from my Nikon were
>  > > > better
>  then
>  > > > what I could achieve from processing the RAW-file (NEF) in
>  Darktable.
>  > > > After some digging on the Internet, I figured out I could
>  > > > use an alternative to the default base-curves in Darktable
>  > > > - and that
>  > > made me
>  > > > get a better starting-point when processing my Nikon
>  > > > RAW-files
>  (and I
>  > > > was able to achieve a better image than the JPGs from my
>  > > > camera!)
>  > > >
>  > > > Today I finished a step-by-step video of what I did, so
>  > > > anyone can
>  > > see,
>  > > > learn and perhaps do it themselves.
>  > > >
>  > > > Some notes before viewing:
>  > > > - I am not really sure behind the technology behind this.
>  > > > I am not
>  

Re: [darktable-user] Embedded color profile and sRGB

[Saint Germain]

On Mon, 25 Jul 2016 15:24:05 +0200, Tobias Ellinghaus <m...@houz.org>
wrote :

> Am Montag, 25. Juli 2016, 15:11:05 CEST schrieb Saint Germain:
> > Hello,
> > 
> > I am generating JPEG with the default settings of Darktable, and it
> > seems that Darktable always include an embedded color profile. Even
> > for sRGB.
> > 
> > However with some software which doesn't know how to correctly
> > process embedded color profiles, the resulting color is completely
> > wrong.
> > 
> > For instance my Firefox gives incorrect results with this simple
> > test: https://kornel.ski/en/color
> 
> For me (using Firefox) only the "Custom ICC PNG" is broken which
> makes sense as PNG is a little special wrt. metadata handling. Could
> you show a screenshot of your result? Mine is here:
> 
> http://picpaste.de/pics/Bildschirmfoto178-vym4PYaz.1469453021.png
> 

Here is mine:
http://imgur.com/a/r5cWd

(Firefox 45.2.0 on Debian Stable)

> > How can I generate JPEG with a sRGB color profile but without any
> > embedded color profile ?
> 
> You can't as that's a bad idea.
> 

Well the problem is that JPEG generated by Darktable are seen with
incorrect colors when viewed through web browser like my Firefox.
I don't have this problem anymore when I remove the color profile.
Why is that such a problem to remove the embedded color profile when
using sRGB ?
The JPEG generated by my Nikon (with sRGB color profile), doesn't have
an embedded color profile for instance...

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[darktable-user] Embedded color profile and sRGB

[Saint Germain]

Hello,

I am generating JPEG with the default settings of Darktable, and it
seems that Darktable always include an embedded color profile. Even for
sRGB.

However with some software which doesn't know how to correctly process
embedded color profiles, the resulting color is completely wrong.

For instance my Firefox gives incorrect results with this simple test:
https://kornel.ski/en/color

How can I generate JPEG with a sRGB color profile but without any
embedded color profile ?
For the moment I manually remove the embedded color profile with
exiftool:
exiftool -icc_profile:all= file.jpeg

Thanks

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[darktable-user] Almost perfect colors with Nikon D7200 and Darktable

[Saint Germain]

I have no idea what I am doing... but it works !

After struggling to get the correct color from my Nikon D7200 with
Darktable, I finally managed to get a near-perfect result.

It was frustrating because the Nikon JPEG were doing a much better job.
I even bought an IT8 target to try the colormatch approach:
https://github.com/pmjdebruijn/colormatch
https://www.darktable.org/2016/05/colour-manipulation-with-the-colour-checker-lut-module/

The colormatch trick gave me almost the same JPEG as the default
Darktable (i.e. with a greenish tint).

I almost gave up when I noticed that (while following the colormatch
procedure) changing the input color profile to "RGB rec2020 linear"
suddenly got rid of the greenish tint.

So now with a base curve "Neutral" and an input color profile to "RGB
rec2020 linear", I have almost perfect colors in every conditions (I
checked on many pictures).

Could someone explain to me what I have done and why it works ?

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Re: [darktable-user] Shooting an IT8 target

[Saint Germain]

On Wed, 22 Jun 2016 10:22:19 +0200, Tobias Ellinghaus 
wrote :

> > I haven't managed to take a correct picture, even though I
> > have followed the requested constraints :
> > - direct sunlight at noon
> > - 35mm objective (equivalent 50mm)
> > - deactivate all "enhance" options (except lens distortion)
> > - ISO 100
> > - aperture between f/8 and f/11
> > - bracketing 1/3
> > 
> > I'm using Gimp to sample the GS0 and GS23 patch, and I am always
> > either above 97% for the GS0 patch or under 3% for the GS23 patch
> > but never at the same time !
> 
> I never tried this myself for lack of such a target, but did you set
> your camera to shoot sRGB images?
> 

No I set it to Adobe RGB as it was specified :
- Set camera to Adobe RGB colorspace

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[darktable-user] Shooting an IT8 target

[Saint Germain]

Hello,

I wanted to try the colour checker lut module with my Nikon D7200 and
bought the requested IT8 target.

I followed the steps described here :
https://github.com/pmjdebruijn/colormatch
Which are more or less what is described here:
https://www.darktable.org/2016/05/colour-manipulation-with-the-colour-checker-lut-module/

However I failed at the first step:
> Open a candidate JPG in GIMP and verify there is no dust or
> glare in the image. Then open the color picker, set sample 
> average, use info window and get HSV values.
> 
> When you sample the white GS0 patch, you should see a value
> of about 97%, and 3% for the black GS23 patch. 

I haven't managed to take a correct picture, even though I
have followed the requested constraints :
- direct sunlight at noon
- 35mm objective (equivalent 50mm)
- deactivate all "enhance" options (except lens distortion)
- ISO 100
- aperture between f/8 and f/11
- bracketing 1/3

I'm using Gimp to sample the GS0 and GS23 patch, and I am always either
above 97% for the GS0 patch or under 3% for the GS23 patch but never at
the same time !

Is there something I am doing wrong ?
Can someone give me some tips in order to get a correct picture ?

Here are the current attempts:
http://imgur.com/a/HBxHn

Thanks in advance

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