Re: [darktable-user] high altitude photography correction challenge

[Koos Pol]

On 2019-07-18 01:25, I. Ivanov wrote:

Recently I took some pictures on a higher altitude - Untersbergbahn 
GmbH. What I noticed is that they have quite a strong blue hue to 
them. This however is only for the landscape pictures (mountains / 
valleys) that I took.


I would be surprised if you'd get this working at all. The (IMHO) most 
important aspect of h.a. photography is the shear distance between you 
and the subject.That can add up to 50 kilometers or more (as you can 
clearly see from your mountain pictures).
Between you and the subject there are so many moist and dust particles 
that half of the light is gone, and the other half is distorted. And you 
don't even get to chose which half you get.


I live in remote flat area with outlook on distant mountains. And I see 
the same sort of problem. On a sunny, dry summer day "my" mountains are 
grayish and dull , while after a big storm I have clear vision, with 
vivid colors for at least 25 kilometers.


My best guess is that successful h.a. photographers simply wait for the 
best opportunity: such as after a big rain, when the air has been washed 
clean. Or during winter time, when the air is dry(er).


Koos



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Re: [darktable-user] One panel with basics

[Koos Pol]

Op 12-07-18 om 04:30 schreef David Vincent-Jones:
The 'simple slider' misses out on all of those subtle nuances that 
makes the output from dt so much different from other systems.


And that's exactly why I'd like such a simple slider, indeed to get rid 
of all the subtle nuances.


Your idea for instance in providing simple sliders for 'shadows' and 
'highlights' .. what filter would you want and what radius?


That's for DT to figure out, or for the SSD (Simple Slider Developer ;-)
Anything which is an improvement over the non-edited version is 
acceptable. And then the person behind the keyboard can select the 
improvement, or deselect it if it didn't give it sufficient improvement 
from his perspective.


... and if I wanted other filters would that be just too bad. It takes 
time and patience to appreciate the fullness of dt, 


You have no idea how often I've been annoyed by the fact that I can't 
find what I think I need, at which point DT doesn't give me any support. 
Just because of the complicated UI and the enormous amount of options. 
For the couple of times per year that I process my raw images it again 
and again takes me a few nights to get going. So yes, for the expert I 
think there is a use case to have all those options available. For the 
occasional photographer like myself DT is a dense tropical forest hard 
to find your way through. BTW, the more options available to more 
important it becomes to have a very well organized UI, whether 
professional photographer or not.



It takes time and patience to appreciate the fullness of dt,


Why do I need to appreciate te fullness of DT?

in my opinion that effort is well compensated through the creative 
capability.


That's not me you're talking about. IMO you're generalizing the DT 
population as (semi) professional photographers who can't survive 
without all the bells and whistles of DT at their disposal.


Koos



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Re: [darktable-user] One panel with basics

[Koos Pol]

Op 10-07-18 om 23:50 schreef Coding Dave:
In reality the options darktable offers make it a nice tool for 
experts and a horrible tool for beginners. For people that did not 
start with an easy to use program like LR it is even harder because 
the learning curve is so high.


You've hit the nail on the head. I use DT much less than I'd like just 
because of the complexity of the GUI and the organisation of the 
modules. I shoot in raw and for my vacation pics, I only need the basics 
to brush them up. But I never know where to find what I need. And I 
really don't want to become a DT expert. That would be so much missing 
the point.  So what happens is that I save up  a years worth of pictures 
(perhaps one hundred) re-learn how to use DT and then process them in 
the second evening of the "DT 101 course". So yes, I support the Basic 
option with a passion :-)


Koos


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Re: [darktable-user] Heavily disappointed about openCL

[Koos Pol]

Op 11-02-18 om 21:06 schreef Bernhard:

Roman Lebedev schrieb am 11.02.2018 um 20:47:

On an unrelated note: not everyone speaks ${langname}

Roman.

sorry, but could figure out how to change:


unset LANG from the command line:

koos@zwaluw:~> date
ma feb 12 17:27:12 CET 2018
koos@zwaluw:~> set | grep LANG
LANG=nl_NL.UTF-8
koos@zwaluw:~> unset LANG
koos@zwaluw:~> date
Mon Feb 12 17:27:17 CET 2018



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Re: [darktable-user] New lens --- where do I put the lensfun database entry?

[Koos Pol]

Can you check what the effects are if you rename/move away/modify 
existing lensfun files?
That could give a clue if DT agrees with you on where to look for those 
files.


Koos


Op 21-05-17 om 09:55 schreef Romano Giannetti:

Hi,

I tried also without the variant line. Same thing, the camera appears 
in the lens correction module, but the lens dropdown is empty. I doble 
checked the spelling of the camera and compared the entry with others, 
but I really can't see why this is not working.


Should I open a bug? Or is still an operator error?

Romano


On 21/05/17 07:11, junkyardspar...@yepmail.net wrote:

The variants apparently don't work, see:

https://github.com/lensfun/lensfun/commit/a48bc3afb87d72b48f176890e080a0b094d31b01#diff-50e22dbf0edf411c0bec00e9df83a7ae

But they shouldn't be needed in this case anyway.

Otherwise, not sure why that wouldn't work.


On Sat, May 20, 2017, at 12:24, Romano Giannetti wrote:

Thanks... almost!

On 20/05/17 18:18, junkyardspar...@yepmail.net wrote:
For compact cameras, you also need to add the entry for the camera 
itself along with the lens:


  
  Panasonic
  DMC-TZ100
  panasonicTZ100
  2.75
  

Also, you might have to remove that 'version="2"' parameter to get 
darktable to load the file.



Ok, now I have the camera but not the lens (
http://pix.toile-libre.org/?img=1495308076.png ) --- The second 
dropdown

is empty.
I tried to add a  record to no avail.

Any further hint? Thanks!

Romano

My file is now:


  
  Panasonic
  DMC-TZ100
  panasonicTZ100
  3:2
  2.75
  
  
  Leica
  DMC-TZ100  compatibles
  fixed lens
  festes Objektiv
  panasonicTZ100
  2.75
  3:2
  
  
  
  
  
  
  
  
  
  vb="1.0002000"/>
  vb="1.0002000"/>
  vb="1.000"/>
  vb="0.000"/>
  vb="0.000"/>
  vb="1.000"/>
  vb="1.000"/>
  vb="0.9995000"/>

  
  



--
Romano Giannetti
http://www.rgtti.com/
 


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Re: [darktable-user] Canon CR2 colour cast problem with multiple exposures at ISO 50

[Koos Pol]

I've run a few checks on openSUSE 42.2. And I made a few funny discoveries:

1. In DT, if I turn the white balance module off, the picture looks very 
much ok.

2. Gwenview shows the picture ok by default.
3. Kolourpaint shows the picture ok by default.
 4. Gimp shows the picture ok by default.

The bottom 3 possible use the same libraries to read the CR2 file. But 
that's just a possibility.


There is definitely a white balance problem. But finding out where it  
is


Koos

Op 20-05-17 om 12:13 schreef Gys van Zyl:
Same issue with darktable 2.2.4. Preview looks OK until opening the 
photo in darkroom. Turning off the white balance module makes it look 
OK again, or in white balance module, pushing the tint up all the way 
to 1.5.


On Sat, May 20, 2017 at 9:32 AM, Swee Oon > wrote:


On 20/05/17 02:31, Roman Lebedev wrote:

On Fri, May 19, 2017 at 6:16 PM, Swee Oon 
  wrote:

I am having this strange problem with darktable and my Canon EOS 6D. Below
is a description of the problem.

Which darktable version?

The problem is either the wrong white balance being read (is that RAW HDR?),
or wrong black/white levels being read.

I'm using darktable 2.0.7, and it doesn't look like I can get any
other later version because my linux mint 17.3 is based on ubuntu
14.04. I'll have to upgrade to linux mint 18.1 to get any later
darktable updates from the pmjdebruijn ppa.

My Canon 6D does not support raw HDR. The file is just a normal
CR2 raw file, with multiple exposures on it. It's possible that
the multiple "averaged" exposures is screwing up the white balance
data, but then why does the jpeg preview look OK? Strangely
enough, my google drive preview of the file also shows a magenta cast.

Before I go into the hassle of installing a new linux mint OS to
use the latest darktable version, can someone confirm that this is
not an issue with darktable's reading of the file? Here is a link
to one of the problem files:





Thanks so much.

Swee

I shot a photo with 9 multiple exposures (averaged) layered on the same
image using my Canon 6D at ISO 50 (camera's "L" setting). The preview was
fine when I viewed it on the back LCD screen of the camera.

The file imported OK into darkroom. The preview in the lighttable module
looked fine. However, when I go into the darkroom module, there is a strong
magenta cast over the photo. If I exit the darkroom module back into the
lighttable module, the preview image again looked fine. In order for
darktable's darkroom image of the file to look like the lighttable preview,
I had to turn off the white balance module inside the darkroom!



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Re: [darktable-user] Laptop screen calibration

[Koos Pol]

Thanks sofar, István. I've been experimenting a lot this week with 
varying results.
I'll get back to you on this topic later, with hopefully a bit more 
understanding from my part on how the various bits correlate.


Koos


Op 23-04-17 om 10:22 schreef KOVÁCS István:

Hi,

Two more things you can do to verify everything is OK:
- run darktable-cmstest; if it reports "Your system seems to be
correctly configured" on the last line, you should be OK (it'll also
output the path of the profile in use, check that, too, so you don't
end up using some generic profile); if it reports "Better check your
system setup - some monitors reported different profiles You may
experience inconsistent color rendition between color managed
applications", it's time to investigate further

- you can also use the command dispwin -V path/to/your/profile.icc to
check if it's loaded; I previously had some cases where the colour
management settings did not work for some reason. If it outputs
"Verify: 'path/to/your/profile.icc' IS loaded (discrepancy 0.0%)",
everything is OK. If not, you can force loading of the profile with
dispwin -V path/to/your/profile.icc. To switch between profiled and
non-profiled mode, you can use dispwin -U (unload)

Kofa


On 22 April 2017 at 16:02, Koos Pol <darkta...@pohw.nl> wrote:

Excellent. I did install the profile via the openSUSE system setting screen.
So that should take care of it.
(darktable-cmstest also reports the new profile. So I think this confirms
it).

That leaves me with two follow up questions:
1. I can forget about the instructions for copying the profile to
~/.config/darktable/color/out ?
2. Is there an easy way to see the factual difference between how a photo
looks now compared to what it was before?

Thanks again!
Koos


Op 22-04-17 om 15:41 schreef Markus Jung:

If you have installed the color profile properly*, you do not need to do
anything more with darktable, because it will obtain and use it
automatically.

* there is a color management daemon running, like gcm, xiccd or
similar, which configures the LUT of your hardware and provides the
profile to applications like darktable, for example by setting the xatom
variable accordingly.

Regards,
Markus

Am 22.04.2017 um 15:29 schrieb Koos Pol:

I'm a bit lost. Last week I've purchased a ColorHug2 to profile my
laptop screen.
I've RTFM of the ColorHug2 and now I'm in proud possession of an .icc
profile for my latop screen.

But I don't know what to do next. I've read the Darktable manual. But
there just too many references to color management. Agreed, I'm a total
novice on that topic.

I just want my photo's to look correctly on the screen. What should I do
next?
FWIW, I'm on openSUSE Leap 42.2

Many thanks,
Koos


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Re: [darktable-user] Laptop screen calibration

[Koos Pol]

Excellent. I did install the profile via the openSUSE system setting 
screen. So that should take care of it.
(darktable-cmstest also reports the new profile. So I think this 
confirms it).


That leaves me with two follow up questions:
1. I can forget about the instructions for copying the profile to 
~/.config/darktable/color/out ?
2. Is there an easy way to see the factual difference between how a 
photo looks now compared to what it was before?


Thanks again!
Koos


Op 22-04-17 om 15:41 schreef Markus Jung:

If you have installed the color profile properly*, you do not need to do
anything more with darktable, because it will obtain and use it
automatically.

* there is a color management daemon running, like gcm, xiccd or
similar, which configures the LUT of your hardware and provides the
profile to applications like darktable, for example by setting the xatom
variable accordingly.

Regards,
Markus

Am 22.04.2017 um 15:29 schrieb Koos Pol:

I'm a bit lost. Last week I've purchased a ColorHug2 to profile my
laptop screen.
I've RTFM of the ColorHug2 and now I'm in proud possession of an .icc
profile for my latop screen.

But I don't know what to do next. I've read the Darktable manual. But
there just too many references to color management. Agreed, I'm a total
novice on that topic.

I just want my photo's to look correctly on the screen. What should I do
next?
FWIW, I'm on openSUSE Leap 42.2

Many thanks,
Koos


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[darktable-user] Laptop screen calibration

[Koos Pol]

I'm a bit lost. Last week I've purchased a ColorHug2 to profile my 
laptop screen.
I've RTFM of the ColorHug2 and now I'm in proud possession of an .icc 
profile for my latop screen.


But I don't know what to do next. I've read the Darktable manual. But 
there just too many references to color management. Agreed, I'm a total 
novice on that topic.


I just want my photo's to look correctly on the screen. What should I do 
next?

FWIW, I'm on openSUSE Leap 42.2

Many thanks,
Koos


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Re: [darktable-user] Font for the UI

[Koos Pol]

Op 10-04-17 om 21:25 schreef darkta...@911networks.com:


Is there a way to change the font for the UI?
My eyes are already a bit older and I have a hard time reading it
all, with those very tiny letters.


They are defined in the file:

darktable.css

for me (linux), it's in /opt/darktable/share/darktable/



Excellent. And DT even honours it, if I copy it to my local 
$HOME/.config/darktable directory and make the changes there :-)


Thanks!
Koos


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[darktable-user] Font for the UI

[Koos Pol]

Hi,

Is there a way to change the font for the UI?
My eyes are already a bit older and I have a hard time reading it all, 
with those very tiny letters.


Thanks,
Koos



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