Re: [darktable-user] darktable-users list, fewer postings?

[Michael Below]

Am Sonntag, dem 23.04.2023 um 12:21 +0200 schrieb Peter McD:
> So where are the postings of other users?

Many people moved to the pixls.us forum:
https://discuss.pixls.us/c/software/darktable/19

Cheers
Michael

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Re: [darktable-user] How to add more black

[Michael Below]

Hi,
I would increase the black point in filmic.
Cheers
Michael

Am 25. Januar 2022 13:05:21 MEZ schrieb Hieke van Hoogdalem 
:
>Hi there,
>
> 
>
>In the manual I couldn't find how to add more black to an image or how to 
>increase the blacks a little bit. It's possible in Photoshop Elements and in 
>Lightroom so I guess it should be possible here too, but I can't find how. I 
>know about local contrast, but that's not what I mean.
>
> 
>
>I hope you can help me out.
>
> 
>
>Kind regards,
>
>Hieke van Hoogdalem
>
> 
>
>
>
>
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Re: [darktable-user] darktable 3.8.0 released

[Michael Below]

Am Freitag, dem 31.12.2021 um 17:05 + schrieb
darkta...@911networks.com:
> 1. I only have bullseye, not bookworm
> 2. I didn't even look, it installed. I only had the .3 and it
> installed and it works. I used it yesterday.
> 3. Now you've prompted me to install .5 which also available from the
> same place:
> 
> https://software.opensuse.org/ and search for what you are missing.
> 

Same issue here. I tried to install 3.8 on Debian Next, but the
packages for Debian Next and Debian 11 both require libexiv2-27 >=
0.27.5-1.1 which is not available in Debian Next or 11. Looks like  the
3.8 packages can't be installed on a regular Debian system: 

dpkg: Abhängigkeitsprobleme verhindern Konfiguration von darktable:
 darktable hängt ab von libexiv2-27 (>= 0.27.5-1.1); aber:
  Version von libexiv2-27:amd64 auf dem System ist 0.27.3-3.1.

I did not try installing further SuSE packages, I prefer not mixing up
my system too much.

Cheers 
Michael

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Re: [darktable-user] Wacom tablet and DT and GIMP

[Michael Below]

Hi,

some years ago I got a small Intuos tablet, it was not as useful as I had hoped 
with darktable. My main conclusion back then: Darktable developers were not 
using tablets, so the tablet interface was not very robust or practical.

It may be different today, and especially for those bigger tablets with a 
screen built in.

Cheers
Michael 

Am 7. April 2021 10:31:57 MESZ schrieb Timur Irikovich Davletshin 
:
>I have one, Bamboo series (no longer in production). Everything worked
>out of the box from very beginning when I bought it about 6 years ago.
>Basic mapping can be done by Gnome configuration center. I believe
>there is something similar in KDE. Gimp works fine with Wacoms.
>
>Timur.
>
>On Wed, 2021-04-07 at 16:40 +1000, Andrew Greig wrote:
>> Hi All,
>> 
>> Are there any users of the Wacom Tablet under Linux who could
>> recommend 
>> a model that works well, or maybe everything works well.
>> 
>> Cheers
>> 
>> Andrew
>> 
>> _
>> ___
>> darktable user mailing list
>> to unsubscribe send a mail to 
>> darktable-user+unsubscr...@lists.darktable.org
>> 

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[darktable-user] Color calibration: white balance disabling not enough

[Michael Below]

Hi,

I am playing with the new version (very nice!), and specifically with
the move from whitebalance to color correction: I noted that it is not
enough to disable whitebalance module. The color correction module will
continue to show an error message (warning triangle) for "previously
whitebalanced" images, saying that the white balance module is using
the camera reference point. I have not yet found out how to get rid of
the warning: Disabling the whitebalance module is not enough. once it
helped to also reset the settings of the whitebalance module (and turn
it back off again), but with other images I am turning around in
circles.

Has anyone else seen this? What is the proper workflow to move from
whitebalance to color correction?

The color correction results look very nice, once I get there...

Cheers
Michael 


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Re: [darktable-user] darktable 3.4 - GNU/Linux binaries - problem installing on Debian testing from repo

[Michael Below]

Hi,

Am Samstag, dem 26.12.2020 um 14:14 +0200 schrieb Stille:
> Hello!
> I'm on Debian testing - I'm assuming the corresponding instructions 
> would be for Debian Next? If yes, trying to follow them gives me a 
> darktable is at the latest version, 3.2.1 message.

I would generally prefer to install software from official Debian
repositories, to keep everything simple.

Darktable 3.4 is in the "unstable" repository. IMHO it should be
possible to download just this package and install it manually:

https://packages.debian.org/sid/darktable

Otherwise you can use "apt-pinning" to install the package from the
unstable branch on Debian testing, see:

https://www.debian.org/doc/manuals/debian-reference/ch02.de.html#_tracking_literal_testing_literal_with_some_packages_from_literal_unstable_literal

After adding unstable repositories and "pinning" the system to testing,
you can choose to install specific packages in the unstable version.

That's what I just did, the new version looks great! Thanks to all
involved!

Cheers
Michael


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Re: [darktable-user] Graphic card opensource drivers

[Michael Below]

Hi,
to add some confusion: I think the only true open source solution for darktable 
opencl is Intel right now. 

Current drivers for Intel offer opencl support, are open source and work with 
darktable. For example my new ThinkPad L13 has opencl support in darktable 
without any proprietary drivers. 

But you should consider that Intel graphics is usually far less powerful than 
AMD or nvidia.

Cheers
Michael 

Am 1. Oktober 2020 14:06:31 MESZ schrieb Marco :
>Hi,
>
>this is a very similar question than the one asked yesterday. But the
>focus is on opensource drivers.
>
>I need a new graphic card. So I searched the manual and mailing list
>what are the options, but I'm still unsure. A lot of information is or
>might be outdated. Although this questions has been asked a dozen times
>already, I couldn't find a definite recent answer.
>
>My needs
>
>- opensource drivers (if at all possible)
>- should work out-of-the-box with no (or little) fiddling
>
>My system:
>
>- Debian stable (might be able to upgrade to testing, if required)
>- currently kernel 4.19
>- Xeon E-2288G
>- 16GiB RAM
>
>The manual¹ states:
>
>  The OpenCL compiler is normally shipped as part of the proprietary
>  graphics driver…
>
>So this indicates that opensource drivers might not work at all
>(meaning: no opencl) and proprietary drivers are mandatory. But maybe
>not, the manual is vague stating “normally”.
>
>Alex wrote²:
>
>  When you use Ubuntu 18.04 you can consider the AMD Graphic  for
>  darktable. Darktable needs extended open-cl support which is not part
>  of the open source amdgpu- driver package. It runs only with the
>  gpupro-driver which is accessable via amd-webiste:
>  https://www.amd.com/en/support/kb/release-notes/rn-prorad-lin-18-20
>
>So this also indicates that there is no opensource opencl support (at
>least with AMD).
>
>However, Šarūnas wrote³:
>
>  > * Which works better in Linux - Nvidia or AMD?
>
>  Both work well. In case of AMD there is an open source option.
>
>  > * Which drivers work (best) for using OpenCL in darktable? Are the
> > open-source drivers okay or do I need the binary drivers from AMD or
>  > Nvidia?
>
>  Open source drivers are okay (ROCm for AMD), including upstream
>  kernels. Just tested with 5.3 RC8.
>
>So there seems to be a solution with AMD. But checking ROCm on Debian,
>I only found the package rocm-smi (AMD ROCm System Management
>Interface) in experimental. Given that Šarūnas post is over a year old,
>and it's not even included in Debian sid yet, maybe that's not an
>option. But I don't know this piece of software, never heard of it.
>
>Guillermo wrote⁴:
>
>  > * Which drivers work (best) for using OpenCL in darktable? Are the
>  >   open-source drivers okay or do I need the binary drivers from AMD
>  or >   Nvidia?
>
>  For NVidia you need the binary drivers, the open source ones are
>  missing some OpenCL capabilities required by darktable.
>
>So this rules out NVidia. And the current state for AMD cards is still
>unclear (to me).
>
>A post from Mikhail⁵:
>
>  In case of AMD you will need a new enough GPU so that it works with
>  the "amdgpu" open source kernel driver, not the "radeon" driver.
>
>This sounds good, but he also wrote⁶:
>
>  AMDGPU is fully open source nowadays and is in the mainline kernel.
>  Everything (except OpenCL for now, unfortunately) works out of the
>  box on Linux.
>
>So this also renders AMD opensource drivers unsuitable.
>
>He suggests searching on phoronix.com, but the most recent post⁷ I
>found was from 2016, so I don't know if the situation has changed
>since.
>
>To conclude:
>
>Guillermo + manual:
>  - no opensource solution for Nvidia
>
>Alex + Mikhail:
>  - amdgpu opensource drivers lack required opencl component
>
>I know the posts are kind of old, so my question is, if anything has
>changed in the mean time? I have the gut feeling that AMD should be the
>way to go. But is there an opensource solution to get opencl to work
>with darktable (on a Debian system)?
>
>If yes, could you recommend any specific adapters/chipsets?
>
>Marco
>
>1
>https://darktable.gitlab.io/doc/en/darktable_and_opencl_activation.html
>2
>https://www.mail-archive.com/darktable-user@lists.darktable.org/msg08659.html
>3
>https://www.mail-archive.com/darktable-user@lists.darktable.org/msg07916.html
>4
>https://www.mail-archive.com/darktable-user@lists.darktable.org/msg07917.html
>5
>https://www.mail-archive.com/darktable-user@lists.darktable.org/msg07922.html
>6
>https://www.mail-archive.com/darktable-user@lists.darktable.org/msg07929.html
>7
>https://www.phoronix.com/scan.php?page=news_item=Darktable-27-Results
>
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Re: [darktable-user] OT : printer in the UK

[Michael Below]

I have ordered prints from the printspace a couple of times, before they closed 
their German - faced website. They were shipped from London, quality was good, 
prices on the high side. They had a handy set of example prints for the 
available media and matching color profiles. The English website is at 
https://www.theprintspace.co.uk/

Michael

Am 4. März 2019 14:30:13 MEZ schrieb Archie Macintosh :
>ProAm Imaging (now part of simlab):
>
>https://www.simlab.co.uk/
>
>mac
>
>On Mon, 4 Mar 2019 at 12:23, Francesco Scaglioni 
>wrote:
>>
>> Hi,
>>
>> Subject says it.  Any suggestions for a good photo print service in
>the UK
>>
>> Cheers
>>
>> Francesco
>>
>>
>>
>
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Re: [darktable-user] Supporting Heidelberg Newcolor 16bit LAB Color TIFF files for high-end film scans

[Michael Below]

Hi,
I remember similar issues some years ago, iirc only imagemagick was able to 
process similar tiff images correctly. I think most other programs were using a 
certain library (gtk?) that caused these issues.
Good luck!
Michael

Am 9. Januar 2019 15:22:52 MEZ schrieb Christian Stromberg 
:
>With the latest update that includes the new spot healing tool, 
>darktable is now a serious choice for scanner operators as well. 
>However, it still fails to correctly interpret 16bit TIFF files in LAB 
>color space that are output by Heidelberg's scanner software Newcolor. 
>This software supports Heidelberg's high-end flatbed and drum scanners 
>that are still in use worldwide in considerable numbers and its output 
>in LAB color space allows for the most flexible editing of the scans. 
>Photoshop and Lightroom do read it correctly while darktable screws up 
>the colors, making everything look neon colored, which btw. is also the
>
>case for many other tools. I still haven't found out what the cause is.
>
>What would be needed to get that fixed? Does it make sense to upload 
>such a TIFF file to rawpixls?
>
>Best wishes,
>
>Christian
>
>
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Re: [darktable-user] Printing

[Michael Below]

Definitely true, but printing by yourself offers more choice of paper and a 
quicker processing of test prints.

Am 13. September 2018 15:28:33 MESZ schrieb "Remco Viëtor" 
:
>On jeudi 13 septembre 2018 14:31:03 CEST Robert Krawitz wrote:
>> On Thu, 13 Sep 2018 14:06:22 +0200, Anders Lund wrote:
>> > torsdag den 13. september 2018 13.38.12 CEST skrev Pascal Obry:
>> >> Le jeu. 13 sept. 2018 à 12:51, Anders Lund  a
>écrit :
>> >> > Bu I still do not get to configure printer settings, like
>quality and
>> >> > optional
>> >> > borderless printing...
>> >> 
>> >> Ah indeed, I have done this early 2018 and the work was merged on
>2018
>> >> Jan
>> >> 10th.
>> >> 
>> >> So starting with next major release (2.6) you'll see the
>TurboPrint
>> >> dialog.
>> > 
>> > That sounds very good, I'll look forward to that! :)
>> 
>> So what's the solution for people who don't want to purchase
>> TurboPrint?
>
>And it sounds like a good print shop is the best solution for
>"occasional" 
>prints (not cheap, but neither is printing for yourself, apparently)
>
>Remco.
>
>
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Re: [darktable-user] Printing

[Michael Below]

Hi,

I think the icc profiles could be collected in an online database like dt 
styles or film development recipes. Probably there will be a need for some 
quality feedback mechanisms, like user reviews or something, but to my 
impression there are a quite a number of people out there with profiling 
hardware that may share their icc profiles.

In my view, the issue is hardware support. E. G. Gutenprint supports only one 
printer in the current xp range of Epson photo printers. That is 
understandable, but in this instance turboprint has better support. 

Cheers
Michael

Am 13. September 2018 07:45:39 MESZ schrieb Pascal Obry :
>Le mercredi 12 septembre 2018 à 18:39 -0400, Robert Krawitz a écrit :
>> I would be happy to discuss what's needed to implement a Gutenprint
>> driver for Darktable.
>
>There is a Gutenprint driver for GNU/Linux (this is not dt specific).
>The issue is the color rendering and management not the driver itself.
>You can print on almost any printer with CUPS+Gutenprint.
>
>Now the color management is a VERY hard issue and not something we can
>do ourself. As I said the paper manufacturer are providing ICC profile
>for all theirs papers for Windows and Mac drivers, but not for
>GNU/Linux one.
>
>That's why TurboPrint is a good solution, they come with a driver and
>color management with a good set of paper.
>
>Hope this clarifies the situation, sorry if I was not clear before.
>
>Best,

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Re: [darktable-user] Printing

[Michael Below]

Hi,
I just got an Epson printer, and found the printer module to be working fine:

I am using Turboprint, including the printer setup tool, with one of their 
paper profiles. The colours are fine. Don't know about 13*18, though.

I am wondering if it is possible to print multiple images onto one page. This 
would be nice to e.g. quickly compare different processing variants of one 
image.

Cheers
Michael

Am 12. September 2018 08:53:09 MESZ schrieb Anders Lund :
>Hello,
>
>I just tried the printing functionality in dt.
>
>First, I did not get presented with printer settings, so I had to set
>the 
>printer defaults (using kde systemsettings and system-config-printer in
>my 
>case).
>
>The paper size list in the printing section of dt is not matching the
>list of 
>papers supported by the printer, and the very common (at least in
>europe) size 
>13*18cm is missing.
>
>I wanted to apply a style, and selected one in the list - but it was
>not 
>applied.
>
>My printer is an Epson 1500w, and the driver is the one provided by
>epson (and 
>recommended by openprinting).
>
>Anyone knows if this part of dt is being worked on?
>
>Kindly,
>Anders
>
>
>
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Re: [darktable-user] Posting large files to mailing lists

[Michael Below]

Hi,

Am 8. Mai 2018 06:23:03 MESZ schrieb Timur Irikovich Davletshin 
:
>On Mon, 2018-05-07 at 16:14 -0700, I. Ivanov wrote:
>> Is it an European practice not to top post?
...
>> It is actually extremely rare when people reply "in line".
>> 
>> So - is it indeed perceived as rude to top post or it is rather
>> regional 
>> preference?
...
>
>Top posting is not something considered rude and I'm OK with it. 
...
>Make it official and inform subscribers.

Top posting vs. inline is a matter of internet tradition (Usenet) vs newfangled 
AOL users/Outlook etc., see 
https://en.m.wikipedia.org/wiki/Posting_style#Top-posting

I learned some time back in Usenet newsgroups that it's rude not to trim down 
your replies to the relevant parts, and to reply inline so people could follow 
the debate more easily. OTOH, using mobile devices or mail clients like outlook 
that is not so easy, and the 90ies are over...

Cheers
Michael

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Re: [darktable-user] Darkrtable segfaults on start

[Michael Below]

This may be a general load issue on your system. Maybe check the temperature 
sensors and run a RAM test.

Cheers
Michael

Am 22. April 2018 13:42:32 MESZ schrieb dt-l...@stefan-klinger.de:
>Actually, I guess this must have something to do with thumbnail
>creation.  I can easily trigger the crash with
>
>$ rm -rf ~/.cache/darktable
>
>and then scrolling up throught the photo collection.  Now darktable
>always crashes immediately when I start it.  I have attached a ggb
>backtrace of this.
>
>If too many threads get started as Johannes suggests, then maybe the
>scheduling logic is broken?
>
>Anything else I can try?

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Re: [darktable-user] Can't find module Lens Correction

[Michael Below]

Hi,
you can set the search path for your library loader (which is different from 
the path used by make). See if the current search path for the library loader 
contains the location of your library.
Cheers
Michael

Am 18. April 2018 03:45:49 MESZ schrieb "André Felipe Carvalho" 
:
>Hello Remko, thank you for your help!
>
>Ok, now I recompiled it without static library. The make install result
>shows:
>
>andre@andre-Inspiron-7520:~/compilar/lensfun-0.3.2/cmake_build$ sudo
>make
>install
>[ 43%] Built target lensfun
>[ 50%] Built target test_modifier_color
>[ 56%] Built target test_modifier
>[ 62%] Built target test_database
>[ 68%] Built target test_modifier_subpix
>[ 75%] Built target test_modifier_coord_scale
>[ 81%] Built target test_modifier_coord_distortion
>[ 87%] Built target test_modifier_coord_geometry
>[ 96%] Built target lenstool
>[100%] Built target python-package
>Install the project...
>-- Install configuration: "Debug"
>-- Installing: /usr/local/include/lensfun/lensfun.h
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-pentax.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-canon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/actioncams.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-nikon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/contax.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-canon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-fujifilm.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-kodak.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-tamron.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/generic.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-fujifilm.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-samsung.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-ussr.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-samsung.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-casio.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-sigma.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-sigma.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-pentax.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-panasonic.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-panasonic.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/6x6.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-zeiss.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-nikon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-leica.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-vivitar.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-zeiss.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-schneider.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-olympus.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-sony.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-panasonic.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-soligor.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-samyang.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-canon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-ricoh.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-tamron.xml
>-- Up-to-date:
>/usr/local/share/lensfun/version_1/compact-konica-minolta.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-sony.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-pentax.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-leica.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-samsung.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-olympus.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-sony.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-samyang.xml
>-- Up-to-date:
>/usr/local/share/lensfun/version_1/slr-konica-minolta.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/mil-sigma.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/compact-nikon.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-ricoh.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/rf-leica.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-olympus.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-tokina.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/misc.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/slr-hasselblad.xml
>-- Up-to-date: /usr/local/share/lensfun/version_1/timestamp.txt
>
>
>
>*-- Installing: /usr/local/lib/liblensfun.so.0.3.2-- Up-to-date:
>/usr/local/lib/liblensfun.so.1-- Up-to-date:
>/usr/local/lib/liblensfun.so*--
>Installing: /usr/local/lib/pkgconfig/lensfun.pc
>-- Installing: /usr/local/bin/lenstool
>-- Set runtime path of "/usr/local/bin/lenstool" to ""
>-- Up-to-date: /usr/local/bin/g-lensfun-update-data
>-- Up-to-date: /usr/local/bin/lensfun-add-adapter
>-- Up-to-date: 

Re: [darktable-user] Printer recommendation / Experience w/ Epson driver and color?

[Michael Below]

Hi,

Am Montag, den 02.04.2018, 19:23 +0200 schrieb Pascal Obry:
> 
> There is confusion. CUPS is a print queue it cannot be compared to
> TurboPrint. The gutenprint and TurboPrint drivers can be compared and
> both are using CUPS as printer queue.
> 
> Note that darktable 2.6 will have better TurboPrint support as the
> TurboPrint options dialog will be used when printing.

Thanks for the clarification. TurboPrint would be my choice if it
supported the printer I'm looking at. I have asked them to support the
XP-15000, and to tell me when it is supported...

(I'm also considering the Canon iP8750, which is already supported by
Turboprint, but I would prefer the Epson, as the print quality seems to
be slightly better, and it is built to hold two types of paper...)

Cheers
Michael

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Re: [darktable-user] Printer recommendation / Experience w/ Epson driver and color?

[Michael Below]

Hi,

Am Montag, den 02.04.2018, 15:41 +0200 schrieb Christian Kanzian:

> Looking for a family 'friendly' printer with low ink costs I decided
> to go for a Epson EcoTank 7700 two months ago. It is quite costly,
> but has a second ink bottle set with 5 colors included. A spare waste
> ink tank is also in the package. 
[...]
> but it is not forseen by Epson for cheap printers that customers
> maintain the printer by themself.  I liked the idea of refillable and
> replaceable wast ink tanks much more.

It seems like there is at least a replacement waste ink tank
("maintenance box")for the XP-15000, but you are obviously right about
the ink costs...

[...]
> The driver comes with a set of paper presets from Epson and a set of
> sizes.

Thank you for the screenshots. I think I will want to use Epson Premium
Luster for the nicer images. Looks like there is no preset for that,
though?
 
[...]
> darktable's print mode picks them up from CUPS (see attachments). 

OK, so the basics are there...

[...]
> But no matter what printer, driver and paper you will select,
> calibration for your setup will be mandatory (see darktable manual). 

I did calibrate my monitor, which has made a big difference... But I
would like to avoid to buy another tool to measure prints. So I'm
interested in readymade ICC profiles for printer/ink/paper
combinations. 

Have you tried to use ICC profiles for print output with the Epson
driver? Is that even possible? I guess one would need to pick the paper
type closest to the one being used and "tweak" the input data for the
driver using an ICC profile?

> What doesn't work in my case is the integrated scanner with iscan
> over WLAN. 

Scanning over LAN/WLAN is difficult, I think. I have a b/w combi
printer/scanner on the LAN, with a nice sheet feeder and scan button,
which insists on scanning only single pages, and only if the scan ist
started on the PC. I think USB is probably a better choice.

Cheers
Michael

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[darktable-user] Printer recommendation / Experience w/ Epson driver and color?

[Michael Below]

Hi,

I am looking at inkjet printers to print photos from darktable on
Debian Linux. Any recommendations?

The Epson XP-15000 looks good (A3+, networked, ca. 300 € in DE, main
drawback probably expensive dye ink, which seems typical for the price
range). But it seems to be too fresh for CUPS/Openprinting/Turboprint
support. Epson says it is supported on Linux in its "ESC/P-R Driver 2
(generic driver)" and the "Epson printer utility".

Any experiences with this generic Epson driver/utility? Are there other
solutions? Is there support for color profiles, a) for Epson inks and
papers b) for third party papers, e.g. Canson Baryta?

I would like to avoid having to buy further hardware for profiling,
sending a few prints off for profiling makes probably more sense for a
start, if there are no "sensible defaults" available.

Cheers
Michael

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Re: [darktable-user] Making numberplates of cars unrecognizable

[Michael Below]

I would use Gimp to pixelate the area.

Cheers
Michael

Am 28. Dezember 2017 11:30:22 MEZ schrieb Lorenzo Bolzani :
>You could try a large radius lowpass with a mask on the plate.
>
>2017-12-28 11:09 GMT+01:00 Dietmar Künkler :
>
>> Hi,
>>
>> Can you give me a hint?
>> How can I make numberplates of cars unrecognizable.
>> Which modules(s) do I have to use for that?
>>
>> Thanks in advance.
>>
>> Dietmar
>>
>>
>>
>
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>> darktable-user+unsubscr...@lists.darktable.org
>>
>
>
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Re: [darktable-user] Re: How would you do this in Darktable

[Michael Below]

Sure, it is a mask. But I wouldn't know how to set a mask for a sharp, 
contrasty cat to differentiate it from a blurry background using parameters. 
Any hints?

Am 9. Dezember 2017 18:56:07 MEZ schrieb darkta...@911networks.com:
>On Sat, 09 Dec 2017 18:46:16 +0100
>Michael Below <be...@judiz.de> wrote:
>
>>Maybe that's something for the wishlist for 3.0: an "intelligent
>>crop" tool that follows objects via contrast/colour?
>
>Isn't it a parametric mask? controlled with the input row?

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Re: [darktable-user] Re: How would you do this in Darktable

[Michael Below]

Maybe that's something for the wishlist for 3.0: an "intelligent crop" tool 
that follows objects via contrast/colour?

Cheers
Michael

Am 9. Dezember 2017 18:03:32 MEZ schrieb "Remco Viëtor" 
:
>On samedi 9 décembre 2017 14:34:43 CET Matthias Bodenbinder wrote:
>> This looks fairly easy unless I am missing something.
>> 
>> 1.) process the photo such that the cat looks good.
>> 2.) apply monochrom module
>> 2.) overexpose the surroundigs of the cat. (separate exposure layer
>with
>> mask)
>> 
>> Matthias
>The tricky bit would be the mask: Darktable isn't the best for
>pixel-precise 
>masks, like you probably need in this case around the cat.
>
>Remco
>
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Re: [darktable-user] Darktable seems to reboot my system.

[Michael Below]

Hey,
just a tip: this might also be a matter of bad RAM, try a memory test.
Cheers
Michael

Am 4. November 2017 21:31:13 MEZ schrieb Michael :
>As I run darktable it seems to suddenly reboot my system. I almost said
>crash but I guess it is a mini crash. Last time this happened I ran it
>about 15 minutes. I edited one image and moved on to the next when
>suddenly
>it goes 'poof'. As it warms up it happens more frequently so I was
>thinking
>it was my video card. 'sensors' said (after the reboot):
>
>bmike1@MikesBeast ~ $ modprobe k10temp
>bmike1@MikesBeast ~ $ sensors
>radeon-pci-0100
>Adapter: PCI adapter
>temp1:+66.0°C
>
>it8718-isa-0228
>Adapter: ISA adapter
>in0:  +1.46 V  (min =  +0.00 V, max =  +4.08 V)
>in1:  +1.94 V  (min =  +0.00 V, max =  +4.08 V)
>in2:  +3.25 V  (min =  +0.00 V, max =  +4.08 V)
>+5V:  +2.99 V  (min =  +0.00 V, max =  +4.08 V)
>in4:  +3.10 V  (min =  +0.00 V, max =  +4.08 V)
>in5:  +3.25 V  (min =  +0.00 V, max =  +4.08 V)
>in6:  +4.08 V  (min =  +0.00 V, max =  +4.08 V)
>in7:  +2.35 V  (min =  +0.00 V, max =  +4.08 V)
>Vbat: +3.15 V
>fan1:3139 RPM  (min =0 RPM)
>fan2:   0 RPM  (min =0 RPM)
>fan3:   0 RPM  (min =0 RPM)
>fan5:   0 RPM  (min =0 RPM)
>temp1:+35.0°C  (low  = +127.0°C, high = +127.0°C)  sensor =
>thermistor
>temp2:+51.0°C  (low  = +127.0°C, high = +127.0°C)  sensor =
>thermal
>diode
>temp3:+52.0°C  (low  = +127.0°C, high = +127.0°C)  sensor =
>thermistor
>cpu0_vid:+1.050 V
>intrusion0:  ALARM
>
>k10temp-pci-00c3
>Adapter: PCI adapter
>temp1:+48.8°C  (high = +70.0°C)
>   (crit = +72.0°C, hyst = +70.0°C)
>
>
>Is darktable known to crash... reboot a system? As I was saying I was
>thinking it was my video card. Is there something I need to do to
>access
>the video card?
>
>:-)~MIKE~(-:
>
>
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AW: [darktable-user] Sepia how to?

[Michael Below]

Hi,

maybe try the sepia styles at dtstyles.net?
I'm not into sepia, but there are different options for this on that site.
The preview on this "Platinotone" one looks good, IMHO:
https://dtstyle.net/index.php/i/281

Cheers
Michael

-Ursprüngliche Nachricht-
Von: darkta...@911networks.com [mailto:darkta...@911networks.com] 
Gesendet: Freitag, 15. September 2017 17:16
An: darktable-user@lists.darktable.org
Betreff: [darktable-user] Sepia how to?

DT 2.2.5 on arch.

How to make sepia?

I've tried using the colorize after the monochrome. I only ended with "puke
yellows".

Any hint/direction?

Thanks

--
sknahT

vyS

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Re: [darktable-user] Re: OpenCL: 1050ti or RX560?

[Michael Below]

Hi,

Am So 03 Sep 2017 12:55:46 CEST
schrieb Brune Wayce <brune.wa...@gmail.com>:

>> Is someone using already NVidia proprietary driver on debian testing?
> Is a problematic installation?

I'm using the NVidia driver on Debian testing with a 750Ti, just checked
my mail archive: 

Initially I had some issues. In 2014, darktable 1.4 was referencing a
different library version than NVidia provided. This got fixed in
darktable 1.6, AFAIK. Then in early 2016 I had a permissions problem
loading the NVidia modules, might have been related to my use
of apparmor, this got also fixed. Since then, stuff just works.

Installation should be easy, just choose the nvidia-* packages in your
package manager, install them.

> And with the various 1050ti (zotac, msi, gigabyte, palit... ) is
> there a card better than the others regarding the use with Linux,
> debian and darktable...?

Don't know... Somebody said it already: if possible, choose a card with
a lot of fast memory. The 1050ti cards I have seen all seem to have 4GB
of GDDR5, this sound finde.

Cheers
Michael

-- 
Michael Below
Rechtsanwalt
www.judiz.de

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AW: [darktable-user] OpenCL: 1050ti or RX560?

[Michael Below]

Hi,

the original poster is on Debian testing, that's not supported by AMD. The 
Debian nVidia packages should work fine. For me, this has been enough to choose 
nVidia, I'm using Debian testing with a 750Ti, and it just keeps working 
through a lot of updates. Of course switching to distribution supported by AMD 
(like Ubuntu 16.04) is also an option. In that case, distribution updates (eg. 
to Ubuntu 17.04) may be a problem.

Cheers
Michael


-Ursprüngliche Nachricht-
Von: Peter Mc Donough [mailto:mcd-mail-li...@gmx.net] 
Gesendet: Donnerstag, 31. August 2017 09:15
An: darktable-user@lists.darktable.org
Betreff: Re: [darktable-user] OpenCL: 1050ti or RX560?

Am 31.08.2017 um 00:07 schrieb Brune Wayce:

> ...
> My budget is little, I have to stay within 150euros: I'm orientated to 
> the AMD RX560 (4GB) or to the Nvidia GTX 1050ti.
> If I look at the various general or "gaming" benchmarks, I find that 
> the 1050ti is faster than the RX560. But if I look here (
> http://www.phoronix.com/scan.php?page=article=darktable-opencl-gp
> u=3) I see that the RX460 (and I assume also the RX560) is faster 
> than the 1050ti. ...

You need OpenCL, i.e. at present a proprietary graphics card driver. I moved 
from openSuse to Ubuntu because of the AMD driver. Fedora should also be 
possible.

I use Darktable 2.2.5 with the AMD RX 460, running with Xubuntu 16.04.03.

The card should be about 120 Euro, pay attention to the type of RAM on the card.

Propriatary driver:
https://support.amd.com/en-us/kb-articles/Pages/AMDGPU-PRO-Driver-for-Linux-Release-Notes.aspx

The AMD opensouce driver with any distro is well supported and should be 
sufficient for most of the work.

cu
Peter

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[darktable-user] Web gallery: Add image titles, metadata?

[Michael Below]

Hi,

yesterday I used the re-worked darktable 2.2 image gallery for the first
time, nice! This is what I need to quickly share some event images without
uploading them to large commercial sites.

But I wondered if it is possible to display titles/descriptions for
individual images in the gallery, and other image metadata like exposure.

There is a feature request to use variables in the gallery title field
(https://redmine.darktable.org/issues/8529) -- IMHO it would be great to be
able to use metadata also with regard to single images.

Cheers
Michael



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[darktable-user] Wishlist: Upscaling via Machine Learning

[Michael Below]

Hi,

last week I took a couple of images at a concert, and it turned out
that only a small part of each image was interesting. I was too far
away, with a wide-angle lens, so the band I wanted to photograph was in
a small part in the center of the frame with lots of other stuff around
them, stage, audience etc. 

Now this can be solved by taking better pictures, coming closer, being
prepared with a telephoto lens etc. - but there also seems to be a
solution that could find its way into darktable.

There have been a number of media reports about machine learning
experiments by Google etc. to add missing detail to images during
upscaling. It seems like the results are often quite convincing. Now I
stumbled upon a Github project for this that seems to offer a hands-on
solution which might be a basis for implementation in darktable:

https://github.com/lucasdupin/ml-image-scaling

What do you think? I imagine this would be useful...

Cheers
Michael

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Re: [darktable-user] Which config for Darktable

[Michael Below]

Hi,

Am Fr 23 Jun 2017 19:11:21 CEST
schrieb Peter Mc Donough :

> Am 23.06.2017 um 17:01 schrieb Mark Heieis:
> > To get AMD opencl on newer cards in Fedora 25, download current
> > CentOS/RHEL amdgpu pro driver (17.10.).
> > 
> > Unpack it and then under root run ./amggpu-pro-install --compute,
> > which just installs opencl support  
> 
> This is as simple as it should be!

Sorry, no... I'm glad it works for you, but this is a hack that might
break with the next update. It's a major advantage that the NVidia
driver is available for a number of distributions, including Ubuntu and
Debian...

Cheers
  Michael

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AW: [darktable-user] Which config for Darktable

[Michael Below]

Hi,

Guillermo wrote:

>> If I get your proposed configuration right, this might mean installing a 4GB 
>> gaming graphics card on a 
>> headless system -- I think it is worth it. But I wonder if it is possible to 
>> get the colors right on a TV, 
>> is calibration possible for a TV backend?

> Calibration is possible using the same systems one uses for a normal monitor 
> (I calibrated one using a Spyder 
> 5). The posible drawback I see is that the (color) quality standard for TVs 
> seems to be lower than por PC 
> monitors at the same price point, at least in my very small sample of 2 of 
> each one.

OK, so the TV is simply used as a monitor? Makes sense... I had the impression 
of something more complex, like having the X display forwarded via network to 
the TV...

Cheers 
Michael


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AW: [darktable-user] Which config for Darktable

[Michael Below]

Hi,

actually, darktable profits much more from OpenCL support than from better 
CPUs/more cores etc. 

If at all possible, try to get OpenCL working. This involves cards from NVidia 
or AMD, and using their closed-source drivers. The NVidia drivers are 
traditionally better at continuing to support older hardware, while people on 
the list had AMD drop support for their reasonable middle-aged card. On the 
other hand, there seem to be more creative ways to get a half-installed AMD 
driver to work on systems it is not intended for. I'm happy with a NVidia card 
(750 Ti, 2GB RAM), used with the boring closed-source driver, this makes a huge 
difference on my aging quadcore.

If I get your proposed configuration right, this might mean installing a 4GB 
gaming graphics card on a headless system -- I think it is worth it. But I 
wonder if it is possible to get the colors right on a TV, is calibration 
possible for a TV backend?

Cheers 
Michael


-Ursprüngliche Nachricht-
Von: Journeyman [mailto:j...@storiepvtride.it] 
Gesendet: Donnerstag, 22. Juni 2017 23:21
An: darktable-user@lists.darktable.org
Betreff: Re: [darktable-user] Which config for Darktable

On 22/06/2017 22:26, Germano Massullo wrote:
> Forget using OpenCL without proprietary drivers, but there is a way to 
> use them without having to install it permanently: if you use a Radeon 
> RX card you can simply unpack the proprietary OpenCL driver somewhere 
> and let darktable use it.
> Concerning hardware, I suggest you to buy a Ryzen CPU and a RX Radeon 
> graphic card

I can confirm that Darktable should take great advantage of multicore CPU and 
lots of RAM. Just an example, see what happens on my PC when I browse a 
collection of RAW files in darkroom: lots of threads and CPU core being used:
https://imgur.com/a/cSNac

Currently I own an aging 4-core AMD so I'm thrilled about the new Ryzen CPUs, 
too.

Unfortunately I have a Radeon HD 5870 which is not supported by the radeon 
driver xf86-video-ati 7.9.0 (ubuntu 17.04)

$ darktable -d opencl
[opencl_init] opencl related configuration options:
[opencl_init]
[opencl_init] opencl: 1
[opencl_init] opencl_library: ''
[opencl_init] opencl_memory_requirement: 768 [opencl_init] 
opencl_memory_headroom: 300 [opencl_init] opencl_device_priority: '*/!0,*/*/*'
[opencl_init] opencl_size_roundup: 16
[opencl_init] opencl_async_pixelpipe: 0
[opencl_init] opencl_synch_cache: 0
[opencl_init] opencl_number_event_handles: 25 [opencl_init] opencl_micro_nap: 
1000 [opencl_init] opencl_use_pinned_memory: 0 [opencl_init] 
opencl_use_cpu_devices: 0 [opencl_init] opencl_avoid_atomics: 0 [opencl_init] 
opencl_enable_markesteijn: 1 [opencl_init] [opencl_init] could not find opencl 
runtime library 'libOpenCL'
[opencl_init] could not find opencl runtime library 'libOpenCL.so'
[opencl_init] found opencl runtime library 'libOpenCL.so.1'
[opencl_init] opencl library 'libOpenCL.so.1' found on your system and loaded 
[opencl_init] could not get platforms: -1001 [opencl_init] FINALLY: opencl is 
NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.

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Re: [darktable-user] How to fix overblown white?

[Michael Below]

Hey,
just a quick note about the basecurve: that curve is very early in the 
processing stack. So if you blow your highlights in this stage, they are gone, 
before you can do something about it.
If there are exposure problems it is far better to use the contrast curve in 
the colour tab, because that is applied later.
Cheers
Michael

Am 4. Februar 2017 08:55:49 MEZ schrieb "Remco Viëtor" 
:
>On vendredi 3 février 2017 22:03:47 CET Anton Aylward wrote:
>> I have a picture of a white barrel cactus (Cleistocactus icosagonus)
>which
>> was taken in strong light, bringing out the white 'leafs'.  The
>> illumination is along one edge, rather like a crescent moon.  The
>crescent
>> is overblown whenever I convert to JPEG, and I can't figure out how
>to
>> manipulate it down without the rest of the image being darkened or
>> distorted.
>
>First thing to check is whether there's anything left to work with in
>the 
>highlights: if you toggle the 'raw overexposure indicator' (the small
>square 
>with the RGB bayer mask under the image') and you see all three
>channels 
>marked as over-exposed, there's nothing really useful you can do
>(except 
>retaking the image, not always an option) 
>
>If that's not the case, and you are working from a RAW file, what you
>can try 
>is using exposure correction with a luminance mask:
>- go to the 'exposure' module
>- set the 'exposure' slider to -1 EV (this will darken your whole image
>for 
>now)
>- then, select 'parametric mask' as 'blend mode', and in the 'input'
>sliders 
>push the left closed triangle all the way to the right. Make sure you
>are at 
>the tab marked with a 'g' (lowercase g!).
>
>To refine your mask, you can play a bit with the positions of the left 
>sliders. But check your image if you do that, I found that in some
>cases I got 
>ugly artifacts when pushing that too much (same reason why I use -1 EV
>maximum 
>with this maksing). If you want to visualise the mask, click once on
>the white 
>square with the black disk on it (bottom right in the module).
>
>Also, in the 'highlight reconstruction' module, select 'reconstruct in
>LCh' as 
>method, that might get you back some detail in the blown parts.
>
>But be prepared to always get some darkening in at least part of the
>image, 
>unless you have a very clear separation between the overblown parts and
>the 
>rest. You don't normally want too sharp a separation between the parts
>you 
>correct and the rest, as that can easily give you edges/banding at the 
>separation)
>
>Btw, there's no reason to turn off the basecurve at any stage in the 
>processing, only to turn it on again later.
>
>Remco
>
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Re: [darktable-user] How to fix overblown white?

[Michael Below]

Hi,
If you want to reduce brightness in the blown highlights without darkening the 
whole image you should reduce the contrast. I would recommend turning off the 
base curve, turning on highlight reconstruction, and turning on a low contrast 
curve. Then, using the clarity preset in the equaliser helps to retain image 
details in the low contrast setting.
Cheers
Michael

Am 4. Februar 2017 04:03:47 MEZ schrieb Anton Aylward :
>I have a picture of a white barrel cactus (Cleistocactus icosagonus)
>which was
>taken in strong light, bringing out the white 'leafs'.  The
>illumination is
>along one edge, rather like a crescent moon.  The crescent is overblown
>whenever
>I convert to JPEG, and I can't figure out how to manipulate it down
>without the
>rest of the image being darkened or distorted.
>
>Other than ending up dealing with layers in GIMP, or somehow masking
>the
>crescent, which, because of the spiky leaves might be awkward, what can
>I do
>about this?  I there some way to 'flatten' the top end of the white
>alone?
>
>I know some controls have sliders, but, for example, keeping the R
>all
>aligned is difficult.  Is there a way to do numeric input or lock
>sliders together?
>
>Or am I just approaching this the wrong way?
>
>-- 
>The radical of one century is the conservative of the next. The radical
>invents
>the views. When he has worn them out, the conservative adopts them.
>--Mark Twain
>
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Re: [darktable-user] Color look up table whitebalance

[Michael Below]

Hi,
Am Dienstag, den 31.01.2017, 12:41 +0100 schrieb johannes hanika:

> > Now, imagine if you instead could simply select the source colors in a
> > picture (which you can!) and choose which target palette they map to (which
> > I think you cannot). This would be almost as quick as the normal white
> > balance tool.
> 
> yes, i agree setting the precise colour target instead of the offset
> would be a nice addition to this tool. if i find time i might try a
> stab at it. i'd be curious to see whether this does something useful
> with a 24-checker thing.

I think the ideal workflow would be like this (similar to the commercial
colorchecker solutions): I would place my IT8 target in the first shot
of a series, and then later in darktable I would mark the edges of  the
target in the image, and the positioning of the patches would be
autodetected (with some perspective correction). Also, I could select
the manufaturer measurements delivered with the IT8-target, probably
after importing the measurements as some kind of preset stored in
darktable. And then darktable would create a color style that I can
apply to the other shots in the series with similar lighting. Then, in a
second step, I could decide to tweak the colors in some direction, e.g.
film-like.

Just dreaming...

Cheers!
Michael


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Re: [darktable-user] Exported JPEGS always darker and more satuated

[Michael Below]

Hi,

I think your problem is Firefox, not darktable. If Firefox has to scale
an image by factor 6,something, it is going to do it roughly and throw
away stuff. If the Gnome image viewer and darktable agree, then your
system seems to be setup alright. 

Try uploading a correctly sized image for the web view, that should
come across right (more or less).

Cheers
Michael


Am Di 17 Jan 2017 21:19:47 CET
schrieb Jeena <he...@jeena.net>:

> Hi,
> 
> > I see JPEG is on https://jeena.net/photos/265 .  
> Yes, the direct link is: 
> https://jeena.net/system/photos/photos/000/000/265/original/kallbadhuset-varberg-night_08.jpg
>  
> and this is a JPEG which does look like the edit preview in Darktable 
> when I look at it in GNOME Image Viewer but loses the details in 
> Firefox, which is better than what I had before, where it didn't have 
> the details in GNOME Image Viewer either. What I changed was the
> export profile from sRGB to Adobe RGB (compatible).
> 
> > Can you share raw, JPEG-from-dt, XMP (and possibly screenshot with 
> > explanations) for others on the list to see ?   
> here is the RAW: http://jeena.net/t/darktable-raw.NEF
> and here the xmp http://jeena.net/t/darktable-raw.NEF.xmp
> 
> > The effect is real in both your examples. I observe similar 
> > differences when processing my photos from Nikon cameras. They do a 
> > whole lot of processing finetuned by in-house color specialists and 
> > engineers. first thing to do is not to expect darktable to match 
> > manufacturer-specific result.  
> I don't think I'm doing that. I take the RAW, import it into
> Darktable, edit it until I like it, then I export it and the JPEG
> result doesn't look like the thing Darktable was showing me while I
> was editing. That is why I tried to get help on the mailing list. I
> don't quite know what a "manufacturer-specific result" is.
> 
> I uploaded also a annotated version of my first image 
> https://jeena.net/t/darktable-export-annotated.png in which "1" is
> the cloud which one can see in the Darktable preview but not in the
> browser, and "2" is the blue gradient in the water which goes down
> much further in the Darktable peview compared to the image in the
> browser, where it's almost black down there. Also the house is
> brighter in the Darktable preview.
> 
> > I personally would first consider changing the base curve. DT
> > offers two base curves for Nikon, "like" and "like alternate", I
> > guess you have tried them already?  
> No I don't think so, I'm also not sure if this is advice to make my 
> editing better or to try to make the dfiierence smaller between 
> Darktable preview and exported JPEG? I am aware of the fact that I'm
> not good at editing yet, but I'd like to find out how I can get the
> same picture out as a JPEG as Darktable is showing me while I'm
> editing.
> 
> /Jeena
> 
> 
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-- 
Michael Below
Rechtsanwalt
www.judiz.de

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Re: [darktable-user] Chosing the optimal CPU for darktable

[Michael Below]

Am So 27 Nov 2016 15:32:24 CET
schrieb Rico Heil :

> This discussion made me check the OpenCL paramters in my current
> darktable installation.
> "activate opencl support" is checked and I cannot uncheck it.
> Does this mean I am forced to use OpenCL or does it mean my GPU does
> not support OpenCL at all and the disabled control shows a default
> value that's irrelevant for me?
> 
> I am using an nVidia GeForce 9800 GT with the video-nouveau driver,
> but wouldn't mind switching to another driver if that would speed up
> darktable.

To find out what darktable is doing start it from the command line,
"darktable -d opencl".

And try switching to the nonfree nvidia drivers. As far as I know,
OpenCL support in nouveau is not yet there. The feature matrix at
https://nouveau.freedesktop.org/wiki/FeatureMatrix/ says "compute" is
not available for most cards, work in progress for some. The nvidia
drivers from nvidia support OpenCL well.

On most systems, OpenCL should speed up darktable. If your system has a
recent CPU and an old graphics card, things may be different.

Cheers
Michael

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Re: [darktable-user] BenQ SW2700PT Photography Monitor & Hardware Calibration

[Michael Below]

I did a hardware calibration for a LG wide gamut monitor using their Windows 
software, which generates an ICC profile, and I'm using the resulting profile 
in Linux. The Windows generated profiles seem more accurate than the Linux ones.

Michael


Am 23. November 2016 03:24:11 MEZ, schrieb "Šarūnas Burdulis" 
:
>On 11/22/2016 04:32 PM, Pascal Obry wrote:
>> 
>> I'm wondering if the BenQ SW2700PT hardware calibration can be used
>on
>> GNU/Linux?
>> 
>> How does it works BTW?
>> 
>> Is a ICC profile done with DispCAL can be sent to the monitor?
>> 
>> Looking for feedbacks from users having used hardware calibration.
>
>I have used NEC wide gamut monitor with their SpectraView software
>(there is Linux version). SpectraView takes over monitor settings, i.e.
>sets desired brigtness cd/m^2, “white point” and then uses USB-attached
>photometer to profile. Profile then can be used by X and apps.
>
>On the other hand, the same photometer can be used with
>argyll/DisplayCAL. In this case, monitor is in “manual” mode,
>brightness
>and individual RGB channels adjusted using monitor controls until
>desired values are reached, and then profiling.
>
>Good results in both cases.
>
>Šarūnas
>math.dartmouth.edu/~sarunas


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Re: [darktable-user] OpenCL trouble, NVidia driver 367.44 "could not create context"

[Michael Below]

Hi,

Am Mo 03 Okt 2016 16:28:14 CEST
schrieb Ulrich Pegelow :

> googling for "nvidia opencl error 209" gives a few hits. This one
> might give some indications:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=839193

Thanks for the quick help, everyone! I had tried google before, but
obviously not using the right keywords...

As described in the bug report, installing libnvidia-ptxjitcompiler has
fixed things for me.

Pascal, Istvan: Thanks for your input, too! But I had it running
before the upgrade, including the ICD for OpenCL.

Cheers
  Michael

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[darktable-user] OpenCL trouble, NVidia driver 367.44 "could not create context"

[Michael Below]

Hi,

today I did the upgrade to the nvidia driver version 367.44, coming
from 361.xx

After the upgrade, darktable can't enable OpenCL anymore, it says it
"could not create context for device", whatever that means.

Any ideas what to do?

I am running darktable 2.06 on Debian testing.

Cheers
Michael

$ darktable -d opencl
[opencl_init] opencl related configuration options:
[opencl_init] 
[opencl_init] opencl: 1
[opencl_init] opencl_library: ''
[opencl_init] opencl_memory_requirement: 768
[opencl_init] opencl_memory_headroom: 300
[opencl_init] opencl_device_priority: '*/!0,*/*/*'
[opencl_init] opencl_size_roundup: 16
[opencl_init] opencl_async_pixelpipe: 0
[opencl_init] opencl_synch_cache: 0
[opencl_init] opencl_number_event_handles: 25
[opencl_init] opencl_micro_nap: 1000
[opencl_init] opencl_use_pinned_memory: 0
[opencl_init] opencl_use_cpu_devices: 0
[opencl_init] opencl_avoid_atomics: 0
[opencl_init] opencl_omit_whitebalance: 0
[opencl_init] 
[opencl_init] could not find opencl runtime library 'libOpenCL'
[opencl_init] could not find opencl runtime library 'libOpenCL.so'
[opencl_init] found opencl runtime library 'libOpenCL.so.1'
[opencl_init] opencl library 'libOpenCL.so.1' found on your system and
loaded [opencl_init] found 1 platform
[opencl_init] found 1 device
[opencl_init] device 0 `GeForce GTX 750 Ti' has sm_20 support.
[opencl_init] device 0 `GeForce GTX 750 Ti' supports image sizes of
16384 x 16384 [opencl_init] device 0 `GeForce GTX 750 Ti' allows GPU
memory allocations of up to 499MB [opencl_init] device 0: GeForce GTX
750 Ti GLOBAL_MEM_SIZE:  2000MB
 MAX_WORK_GROUP_SIZE:  1024
 MAX_WORK_ITEM_DIMENSIONS: 3
 MAX_WORK_ITEM_SIZES:  [ 1024 1024 64 ]
 DRIVER_VERSION:   367.44
 DEVICE_VERSION:   OpenCL 1.2 CUDA
[opencl_init] could not create context for device 0: 209
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.


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Re: [darktable-user] 360 degree panoramas

[Michael Below]

Hi,
I've also done panoramas from a monopod, eg from a mountain top. The monopod 
helps to keep the horizon even, compared to a free hand approach. Of course, a 
tripod improves quality even further, but it's not a must.
Cheers
Michael

Am 15. September 2016 09:18:59 MESZ, schrieb Tobias Ellinghaus :
>Am Mittwoch, 14. September 2016, 17:16:34 CEST schrieb Anton Aylward:
>
>[...]
>
>> One ABSOLUTE requirement you *** MUST *** get for panoramic shots is
>a
>> tripod. You need a stable platform.  A tripod with a tilt head
>is
>> going to let you rotate smoothly so it is is easier when you piece
>together
>> you shots using 'hungin'.
>
>Sorry, but that is not true. As long as there are no objects near the
>camera 
>that could introduce parallax errors (i.e., they move relative to the 
>background between images because you are not rotating the camera
>around its 
>nodal point, so you are basically looking behind the object) you can
>get 
>perfectly fine panoramas shooting free hand. Kees (andabata on IRC)
>does that 
>all the time with awesome results. Have a look at his Flickr page for
>examples
>
> https://www.flickr.com/photos/andabata/
>
>That being said, a tripod with a panoramic head IS at least a HUGE help
>when 
>there are more layers in the scene then just a flat foreground and a 
>background.
>
>[...]
>
>Tobias


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Re: [darktable-user] Re: Export to JPG Pics are blurred

[Michael Below]

Am Freitag, den 13.05.2016, 20:02 +0200 schrieb Matthias Bodenbinder:
> Am 13.05.2016 um 10:41 schrieb Blickwinkel:

> > In the meantime I found out that the image viewer smooths images when
> > enlarged or reducers. In the settings you can turn that off, now it looks
> > better, but not optimal. In addition, the other color rendering remains. I
> > think this is probably due to the export.

I think you have used more sharpening in the RAW edit than in the JPG.
If you export the RAW to JPG with the settings in the XMP, the fresh JPG
looks similar to your RAW. If you reset the sharpening to default for
the RAW in darktable the results look very similar to the JPG you
provided. 

The amount of sharpening done also has an effect on the colors. It is
recommended to use a calibrated monitor for colors and lightness. 

But, as somebody else said, the RAW edit does not contain more details
-- the eyes are just not very sharp (the pants seem to be a bit more in
focus, maybe the head is blurred by her movement?).

Ciao
  Michael


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Re: [darktable-user] Black & White in the darkroom

[Michael Below]

Hi,

I think the VirtualBox shouldn't make a difference. Screen calibration
makes a huge difference, though, and I don't know if VirtualBox can
handle that.

To move rulers more precisely try right-clicking on them, on the top of
the curve that shows you can change them quickly, on the bottom finely.
And you can type numbers into that field, if you know you want a
+.0.025 change.

For a more automatic approach, try the Equalizer and Tonemapping/Global
Tonemapping modules. But in general, darktable is not as good as
Lightroom in "getting it somehow right automatically", while it allows
to fiddle more in detail.

Cheers
Michael

Am So 27 Mär 2016 16:59:29 CEST
schrieb Manfred Rebentisch <ma...@comparat.de>:

> Hi Michael,
> thank you!
> I try that way and the result is somewhat better. I try it out with
> debian jessie in a VirtualBox machine. I think, it is better to test
> again with my real machine another day.
> It is very difficult to make changes. If I try to move a ruler with
> the mouse I need to move only 2 or 5 pixels. The color curve
> (Farbkurve) moduls shows a peak of ca. 15 pixels width and I have to
> set the curve exactly to that peak. In the contrast module it is a
> very big difference between +0.02 and +0.03 - not very usable.
> 
> so long
> Manfred
> 
> Am 27.03.16 um 15:36 schrieb Michael Below:
> > Hi,
> > 
> > AFAIK there is no german language forum/list.
> > 
> > I don't know what makes your results so horrible, so just a guess:
> > You are inverting the image and removing the color. This may
> > produce some kind of middle-gray mush. I think you need to apply
> > some kind of contrast ("Farbkurve" module, start with the medium
> > preset "mittlerer Kontrast") and correct the white/black levels
> > (module "Belichtung", start with the automatic by clicking on the
> > pipette on the right), you might also try to add some clarity/other
> > equalizer settings (module "Equalizer", preset "Klarheit").
> > 
> > Cheers
> > Michael
> >   
> 
> 


-- 
Michael Below
Rechtsanwalt
www.judiz.de

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