Re: [darktable-user] darktable 4.2.0 released

[Tim Rolph]

On Thursday, 22 December 2022 19:21:18 GMT Jan Ingwer Baer wrote:
> On 21-Dec-22 12:48, Pascal Obry wrote:
> > We're proud to announce the new feature release of darktable, 4.2.0!
> > 
> > ...
> > 
> > Since darktable 4.0:
> > 
> > - Almost 1411 commits to darktable+rawspeed
> > - 409 pull requests handled
> > - 60 issues closed
> > 
> > ## The Big Ones
> 
> ...
> 
> > - Some cameras record lens correction information within the image
> > 
> >EXIF metadata.  The lens correction module has been enhanced so that
> >it can extract this data and use it to correct lens distortions.
> 
> Is there any documentation which camera models are supported?
> 
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The module can make use of the data from the lens for Fuji and Sony cameras at 
the moment.

Tim.




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Re: [darktable-user] darktable-chart fails to recognize my

[Tim Rolph]

On Tuesday, 25 August 2020 11:55:51 BST Victor wrote:
> I'm trying to create a color profile for real color of my Sony a6600
> following the instructions in
> https://pixls.us/articles/profiling-a-camera-with-darktable-chart/ .
> Therefore I shot my ColorCheckerPassport, created the pfm file from the raw
> file,  loaded it as source image referring to chart
> ColorCheckerPassport.cht. All this successfully. BUT... in the tab
> 'reference values' selecting, as required, the mode as cie/it8 file and
> loading the corresponding CIE, that is, in my case,
> ColorCheckerPassport.cie I got stucked. No way of the cie file to show up
> and going on.
> 
> What was wrong with my procedure?
> 
> Thanks a lot
> 
> Vittorio
Hi Vittorio, try running darktable-chart from a terminal as this should 
provide some error information.

Tim.




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Re: [darktable-user] Re: darktablle-chart Help

[Tim Rolph]

On Monday, 13 April 2020 17:40:08 BST David Vincent-Jones wrote:
> I am unable to enter any chart number ... the field is locked and only
> shows "None"
> 
> Any ideas?
> 
> David
> 
> On 2020-04-12 9:33 p.m., David Vincent-Jones wrote:
> > I am trying to use darktable -chart and have produced a .pfm file from
> > a raw shot of a Wolf-Faust target.
> > 
> > On tab-1/'Image': I have entered the pfm file name but the 'chart'
> > field is locked showing "none".
> > 
> > On tab-2/'reference' the mode is set to 'it8' but the ref.-it8 field
> > is locked with a value of "none"
> > 
> > Can somebody tell me what is going on?
> > 
> > Manjaro/Arch/XFCE current git install.
> > 
> > David
> 
> 
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David, your Wolf-Faust target should have come with a reference file. I assume 
your using the 
C1 A4 size chart! If so the reference file will begin with R0 or R1. This is 
the file that you need 
to edit!
If you do not have the reference file you can download it from 
http://www.targets.coloraid.de/
[1] 

The number you require is on the target.

Tim.
 



[1] http://www.targets.coloraid.de/


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Re: [darktable-user] darktablle-chart Help

[Tim Rolph]

On Monday, 13 April 2020 05:33:15 BST David Vincent-Jones wrote:
> I am trying to use darktable -chart and have produced a .pfm file from a
> raw shot of a Wolf-Faust target.
> 
> On tab-1/'Image': I have entered the pfm file name but the 'chart' field
> is locked showing "none".
> 
> On tab-2/'reference' the mode is set to 'it8' but the ref.-it8 field is
> locked with a value of "none"
> 
> Can somebody tell me what is going on?
> 
> Manjaro/Arch/XFCE current git install.
> 
> David
> 
> 
> 
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Hello David, I had the same problem and found that I had to edit the reference 
file for the chart and add a "0" before all the patch id that had single 
digits!

So in the reference file A1 becomes A01 B1 becomes B01 etc. A10 etc  is fine 
to leave as is.

hope this helps.

Tim. 




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Re: [darktable-user] Camera Nikon D850 not on dropdown list although listed in files

[Tim Rolph]

On Tuesday, 3 December 2019 18:05:51 GMT Jesus Arocho wrote:
> Yep, it is installed, the attached lenses are found; camera is not.
> 
> 
> 
> -Original Message-----
> From: Tim Rolph 
> To: darktable-user 
> Sent: Tue, Dec 3, 2019 12:12 pm
> Subject: Re: [darktable-user] Camera Nikon D850 not on dropdown list
> although listed in files
> On Tuesday, 3 December 2019 15:33:22 GMT Jesus Arocho wrote:
> > I find the Nikon D850 in the files (rawspeed directory), but the program
> > will not list it as available in the lens correction module.  Anyone know
> > why?
> > 
> > __
> > __ darktable user mailing list
> > to unsubscribe send a mail to
> > darktable-user+unsubscr...@lists.darktable.org
> Have you installed "Lensfun"?
> It's required by darktable for lens correction.
> If you have it installed then perhaps update your lens data via "lensfun-
> update-data"
> 
> Regards,
> 
> Tim.
> 
> 
> 
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> 
> 
> 
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Which version of darktable are you using?

Tim.




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Re: [darktable-user] Camera Nikon D850 not on dropdown list although listed in files

[Tim Rolph]

On Tuesday, 3 December 2019 15:33:22 GMT Jesus Arocho wrote:
> I find the Nikon D850 in the files (rawspeed directory), but the program
> will not list it as available in the lens correction module.  Anyone know
> why?
> 
> 
> darktable user mailing list
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Have you installed "Lensfun"? 
It's required by darktable for lens correction.
If you have it installed then perhaps update your lens data via "lensfun-
update-data" 

Regards,

Tim.



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Re: [darktable-user] Fwd: Base curve generation process

[Tim Rolph]

On Tuesday, 28 May 2019 10:04:05 BST Florian W wrote:
> Hi there,
> 
> Does anyone know if the procedure to generate base curves is still up to
> date ?
> On this (5 years old) page :
> https://www.darktable.org/2013/10/about-basecurves/#comment-30544
> Or in the README of $darktable_src/tools/basecurve.
> 
> Or maybe someone has successfuly generated its camera's basecurve and can
> provide more guidance ?
> 
> I tried to generate curves for my Canon 750d with shots unfocused, both
> over and under exposed at the same time as instructed (see the jpeg at
> https://ibb.co/C29R6Q9).
> And well, as you can see the generated curve is not very useful... see
> https://ibb.co/rG5yvnm
> 
> Does one has to do a lot a sample shots (and maybe more diverse kind of
> shots) to get a correct result ?
> 
> Thanks !
> 
> 
> Florian Wernert
> Software engineer INSA
> In-training Neuroscience researcher
> https://www.linkedin.com/in/wernertflorian
> 
> 
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Hi there, you could take a look at Harry Durgin's excellent videos on the 
subject at 
https://www.youtube.com/user/harrydurgin/videos

He covers both basecurve and tonecurve generation.

Regards,

Tim Rolph



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Re: [darktable-user] darktable-chart reference it8

[Tim Rolph]

On Sunday, 1 July 2018 16:01:32 BST Marco wrote:
> On Sun, 01 Jul 2018 15:10:31 +0100
> 
> Tim Rolph  wrote:
> > have a look at the 3 attached screen captures. I think they show
> > it clearly.
> 
> Indeed, it works for you. I tried using *your* reference file from
> 
>   http://www.colorreference.de/targets/R090405.zip
> 
> Same result. Then I checked the console output of darktable-chart
> and it reports:
> 
>   error with the IT8 file, can't find sample `J01'
> 
> The problem is that in the reference file the single digit numbers
> don't have a leading zero, whereas the it8.cht file (from argyll
> 2.0.0) requires a leading zero:
> 
>   awk '/J0*1 /{print $1}' R123456.txt /usr/share/color/argyll/ref/it8.cht
>   J1
>   J01
> 
> I fixed this with
> 
>   sed -i 's/^\([A-Z][A-Z]*\)\([0-9]\) /\10\2/' R123456.txt
> 
> Then also the txt extension was recognised. So the problem was a
> leasing zero mismatch. It's working now.
> 
> Thanks for the quick response. It encouraged me to investigate.
> 
> Marco
> 
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Oh I remember having to do that as well a long time ago.

Tim.




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Re: [darktable-user] darktable-chart reference it8

[Tim Rolph]

On Saturday, 30 June 2018 19:11:37 BST Marco wrote:
> Hi,
> 
> I have a question regarding profiling with an it8 target and
> darktable-chart.
> 
> What I've done so far:
> 
> - captured it8 reference images
> - corrected exposure to match patch GS0
> - corrected black point to match patch GS23
> - corrected white balance to patch GS5 ← LAB_L > 0 && min(LAB_A² +
>   LAB_B²)
> - exported to PFM (float) with Lab profile
> 
> Then in darktable-chart:
> 
> source image tab:
> 
>   image: exported_image.pfm
>   chart: /usr/share/color/argyll/ref/it8.cht
> 
> reference values tab:
> 
>   mode: cie/it8 file
>   reference it8: ??
> 
> This is where I got stuck. The reference should be the file R123456.txt
> shipped with the target, right? Selecting it doesn't work,
> darktable-chart doesn't accept it. I only found tutorials using a jpeg
> as reference. But if I understand correctly, it should be possible to
> match the supplied reference values. But how? Or do I need to convert
> the R123456.txt file somehow? Any pointers appreciated.
> 
> darktable 2.4.4
> 
> Marco
> 
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Hi Marco you have to rename your reference file to a .cie file first, then 
darktable-chart will recognize it. I had the same problem.

Regards,
Tim.




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Re: Aw: Re: [darktable-user] Exported JPG vs. Camera JPG

[Tim Rolph]

Hi Thomas, I used Wolf Faust R1 just because I already had it to calibrate my 
scanner but if I were too get another one for my camera I would get the C1; 
its 3 times the cost of the R1 at 30 euro but its bigger (A4) and non-glossy 
so it's easier to get a good shot.
I have had disappointing results with custom ICC profiles maybe in part because 
of the scanner target, but the darktable-chart styles that I created with it 
in different lighting situations have all had near identical positive results.
Over all I agree with Jo about  darktable-chart.

Tim.


On Monday, 23 October 2017 09:10:26 BST Thomas Werzmirzowsky wrote:
> > Gesendet: Montag, 23. Oktober 2017 um 07:47 Uhr
> > Von: "Robert William Hutton" <r...@helms-deep.net>
> > An: darktable-user@lists.darktable.org
> > Betreff: Re: [darktable-user] Exported JPG vs. Camera JPG
> > 
> > On 22/10/17 20:27, Thomas Werzmirzowsky wrote:
> > > I shot a portrait with my Canon EOS 60D and noticed that the JPG from
> > > the Canon in portrait image mode looks significantly better than the one
> > > exported from Darktable. Especially the blue color looks much more
> > > natural in the camera JPG.
> > 
> > I have a 60D and a 5d mark iii. I can vouch for the fact that the
> > "enhanced colour matrix" that is the default does a poor job with the 60D
> > raws (generally much better with the 5d3 raws), mostly with the blues.
> 
> Yes that's what I noticed too. If I switch to "standard colour matrix" the
> results are much better.
> > I found creating my own matrix from a Wolf Faust target worked really
> > well,
> 
> Tim Rolph also mentioned the Wolf Faust target but I have to admit that
> looking at the website I don't know what to order. What "Order #" would be
> the right one?
> > but ultimately decided that having the additional dependency of having
> > that profile present if I wanted to re-edit the images at a later date
> > wasn't worth it, and I do much as you do: use the standard profile.
> > Sometimes also setting the gamut clipping to linear rec2020 is a good
> > option as well.
> I don't really get that. Don't you have to create the profile just once and
> then it's done? As the color mapping should contain all colours it
> shouldn't change from photo shot to phot phot, should it? Or would it be
> needed to create a new matrix for every photo shot just like doing a gray
> card shot for the white balance?
> > I can probably dig up the 60D profile if you'd like to try it.
> 
> It would be great if you could lookup the profile. I'd like to give it a
> try.
> > Regards,
> > 
> > Rob
> 
> Thanks a lot. Also @Tim Rolph.
> 
> Best regards
> Thomas
> 
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Re: [darktable-user] Exported JPG vs. Camera JPG

[Tim Rolph]

Hello Thomas, I used darktable-chart and a color chart from Wolf-Faust to 
create a style that closely matches  my camera's jpeg output and I am very 
happy with the results.
Have a look at these links.

https://www.darktable.org/usermanual/ch10s03.html.php

https://www.darktable.org/usermanual/ch10s03s06.html.php

http://www.youtube.com/watch?v=11nInNWJHWk

http://www.targets.coloraid.de/

Tim.

On Sunday, 22 October 2017 11:27:03 BST Thomas Werzmirzowsky wrote:
> Hello everybody,
> 
> I shot a portrait with my Canon EOS 60D and noticed that the JPG from
> the Canon in portrait image mode looks significantly better than the one
> exported from Darktable. Especially the blue color looks much more
> natural in the camera JPG. So I tried to simulate the same result using
> the Darktable modules but I couldn't achieve it. According to Darktable
> the blue colors might be out of gamut. Could that cause the problems?
> But anyway the camera can convert it to good looking blue colors.
> 
> Ideally I would have a Darktable style that would (at least in most
> cases) be quite close to the camera JPG. Can this be achieved and if so,
> how?
> 
> You can find the RAW and JPG files here:
> https://www.dropbox.com/s/77lg2nn9yrd2kpp/image.zip?dl=0
> 
> Any help would be highly appreciated.
> 
> Best regars
> Thomas
> 
> 
> 
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Re: [darktable-user] Re: OpenCL: 1050ti or RX560?

[Tim Rolph]

Hi I have the GTX 1060 and am using on Debian Testing with no problems. I am 
also using with an old AMD 8120 8 core CPU so have enabled the "Very fast GPU" 
option in the git version of dt, I don't know if this has made it into the 
latest release yet or not but I have found a big increase in the speed of dt.
You must enable non-free in Debian repositories to install the nvidia drivers.

Tim

On Sunday, 3 September 2017 12:55:46 BST Brune Wayce wrote:
> Ok, after all your precious tips and explanations I think I'll go with the
> NVidia 1050ti and the proprietary driver.
> 
> Is someone using already NVidia proprietary driver on debian testing? Is a
> problematic installation?
> 
> 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...?
> 
> Thanks,
> BW
> 
> 
> Il 31/ago/2017 00:07, "Brune Wayce"  ha scritto:
> 
> Hello
> I'm a newbie of Darktable and I need some advices :)
> 
> My computer is a desktop Intel i5-3450 _without_ dedicated gpu, and my OS
> is Debian Testing. I use Darktable 2.2.5 (compiled from source).
> With files from my old camera (Oly E-520) the speed and reactivity of
> Darktable is accettable, but with files from my "new" camera (Panasonic G7)
> the
> performance is poor, so I want to improve the performance adding a new GPU
> so to take advantage of the OpenCL.
> 
> 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-gpu=3) I see that the RX460 (and I assume also the
> RX560) is faster than the 1050ti.
> If I look at the economical side, the 1050ti is a little more expensive
> than the RX560.
> 
> The question is: what do you suggest me to buy? The RX560 or the 1050ti? Or
> another one, different from this two?
> 
> Looking at this mailing list I've seen that there is also the problem of
> the drivers for the GPUs. I can use the Open driver or the Proprietary one,
> simply I'll choose the faster/better of the two.
> 
> And last: is my linux distribution (Debian testing) problematic for the
> installation of the Open/driver?
> 
> Thanks to all,
> BW
> 
> 
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Re: [darktable-user] linux distribution with dark table already on it??

[Tim Rolph]

If you are using KDE then you need to make sure that colord-kde as well as 
colord are installed. In Debian colord-kde is still in the experimental 
repository, but it's working for me.

Tim.
On Friday, 18 August 2017 08:59:38 BST Jochen Spieker wrote:
> m...@artfromcameras.com:
> > Brand new to linux, and looking to add darktable.  I am currently using
> > Linux Mint 18.2 Cinnamon with the 64 bit os.  It has gimp, but another
> > lightroom replacement that is not non destructive.  With my limited
> > experience with linux, it might actually be easier to change the
> > distribution.  The ideal distro would have Gimp, Darktable, some form of
> > monitor calibration software, and some scanning software.
> 
> Probably all distributions "have" that, you just need to learn how to
> install software from the distribution's repositories. You need to learn
> that anyway so I think it is easier than reinstalling from scratch.
> 
> For any Debian-based distribution you usually just need to "sudo apt
> install darktable" to install Darktable. For the rest you just need to
> figure out which packages you need to install.
> 
> For example:
> 
> $ apt-cache search display calibrat
> argyll - Color Management System, calibrator and profiler
> argyll-dbg - debugging symbols for argyll
> argyll-doc - Color Management System, calibrator and profiler
> (documentation) argyll-ref - Color Management System, calibrator and
> profiler (data files) dicomscope - OFFIS DICOM Viewer
> dicomscope-doc - OFFIS DICOM Viewer - documentation
> libdicomscope-jni - OFFIS DICOM Viewer (JNI files)
> dispcalgui - Graphical user interface for the Argyll CMS.
> imagej - Image processing program inspired by NIH Image
> jstest-gtk - joystick testing and configuration tool
> kgamma5 - monitor calibration panel for KDE
> python-pyoptical - python interface to the CRS 'OptiCAL' photometer
> r-cran-rocr - GNU R package to prepare and display ROC curves
> xcalib - Tiny monitor calibration loader for Xorg
> 
> A good candidate appears to be "dispcalgui" which you can install by
> running "sudo apt install dispcalgui". Package dependencies
> automatically pull in everything you need (argyll, besides others, in
> this case).
> 
> J.



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Re: [darktable-user] Wishlist: Upscaling via Machine Learning

[Tim Rolph]

Have you tried using neat?
On Thursday, 10 August 2017 00:04:26 BST Andy wrote:
> What you really want is deep nets trained for specific sensors/ISO
> combinations
> for denoising. Looks like neat doesn't use deep learning (if they would,
> I'm sure they'd mention it in their explanation).
> So it's unlikely to be state of the art (last time I checked).
> 
> On 07/10/2017 12:05 PM, Tim Rolph wrote:
> > Hi, if I have to upscale an image I usually use Reshade from
> > www.reshade.com it is a free app the works very well although its only
> > for windows but works fine under wine. Oh and its also free. If I ever
> > have a problem with noise I use Neat Image https://ni.neatvideo.com/ they
> > have a free linux version that is limited to save only in jpg but has
> > support for opencl / cuda GPU processing and it gives unbelievably good
> > results.
> > 
> > Tim.
> > 
> > On Sunday, 9 July 2017 17:16:12 BST Michael Below wrote:
> >> 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
> >> _
> >> ___ darktable user mailing list
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> >> darktable-user+unsubscr...@lists.darktable.org> 
> > __
> > __ darktable user mailing list
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> 
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Re: [darktable-user] Wishlist: Upscaling via Machine Learning

[Tim Rolph]

Hi, if I have to upscale an image I usually use Reshade from www.reshade.com 
it is a free app the works very well although its only for windows but works 
fine under wine. Oh and its also free. If I ever have a problem with noise I 
use Neat Image https://ni.neatvideo.com/ they have a free linux version that 
is limited to save only in jpg but has support for opencl / cuda GPU 
processing and it gives unbelievably good results. 

Tim.

On Sunday, 9 July 2017 17:16:12 BST Michael Below wrote:
> 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] noise profiling

[Tim Rolph]

Hello Tobias, the 300D CRW files are supported in darktable but there is no 
profiled denoise.
The noise profiling program /darktable/tools/noise/gen-profile does not 
recognise the raw files from it so I had to convert them into DNG format first.
should it?

Tim
 
On Wednesday, 10 May 2017 16:31:25 BST Tobias Ellinghaus wrote:
> Am Mittwoch, 10. Mai 2017, 15:06:51 CEST schrieb Tim Rolph:
> > Hi All, I tried to generate a noise profile for my camera "Canon EOS 300D"
> > that currently has no profiled denoise and found that gen-profile will not
> > recognize my camera's Raw files ".CRW ".
> 
> The 300D should be supported. Do you get any error messages hinting at the
> problem? Maybe you could upload a sample file somewhere and send us a link?
> 
> [...]
> 
> > Tim
> 
> Tobias



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[darktable-user] noise profiling

[Tim Rolph]

Hi All, I tried to generate a noise profile for my camera "Canon EOS 300D" that 
currently has no profiled denoise and found that gen-profile will not recognize 
my camera's Raw files ".CRW ". I had to convert them into DNG files first 
before 
it would do anything. Now I am unsure if the quality of the output will have 
been affected by the conversion. Any advice?

Tim

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Re: [darktable-user] Basecurve for LGE Nexus 5X.. how to do it?

[Tim Rolph]

Hi Malte, you could try darktable-chart . Of all the methods that I have tried 
it seems to give the best comparison to the in camera jpeg.
It not only matches the tone curve of the image but also the color.

Have a look at,

http://weeklyedit.com/camera-profiling-darktable-chart/

You will need a color chart though.
I used a wolf-faust scanner calibration chart that I already had because it 
has 288 color patches and therefore should produce a more accurate color match 
you can get one from, 

http://www.targets.coloraid.de/

Hope this helps.

Tim.


On Monday, 24 April 2017 23:26:18 BST Malte Cornils wrote:
> Hi Tim,
> 
> thanks - it's certainly helpful for the process, and I redid a whole ISO
> series now. Unfortunately, I still don't get anything resembling a proper
> curve.
> 
> Any other ideas?
> 
> -Malte
> 
> 2017-04-23 15:42 GMT+02:00 Tim Rolph <timro...@timrolph.plus.com>:
> > Hi Malte, have you seen this video on basecurves?
> > 
> > http://weeklyedit.com/basecurves/
> > 
> > Tim.
> > 
> > On Saturday, 22 April 2017 23:14:13 BST Malte Cornils wrote:
> > > Hi,
> > > 
> > > although there is now even denoise support for the RAW DNG's created by
> > > LG's Nexus 5X phone main camera, the basecurve between JPG and RAW seems
> > > very much off. I was trying to follow
> > > http://www.darktable.org/2013/10/about-basecurves/ to create my own
> > > basecurve, but the result was much worse:
> > > 
> > > While dt-curve-tool-helper worked following a mixture of the article and
> > > the tools/basecurve/README.md for both RAW DNGs/JPGs, and the curve tool
> > > invocation generated a useable shell script (attached), this did not
> > > look
> > > like a curve at all and had horrible colours.
> > > 
> > > I tried with both a black/white picture following the blog instructions,
> > 
> > as
> > 
> > > well as a normally exposed one. You can find them here (my own work and
> > > CC0-licensed):
> > > 
> > > https://srv.cornils.net/DSC_0132.DNG
> > > https://srv.cornils.net/DSC_0132.JPG
> > > https://srv.cornils.net/DSC_0135.DNG
> > > https://srv.cornils.net/DSC_0135.JPG
> > > 
> > > (will leave them up there for at least six months)
> > > 
> > > How can I get a reasonable basecurve out of those images? They were
> > > generated by FV-5 camera app, which has DNG RAW support.
> > > 
> > > Thanks
> > > -Malte
> > > 
> > > 
> > 
> > 
> > 
> > > 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+unsubscribe@
> > lists.darktable.org
> 
> 
> darktable user mailing list
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Re: [darktable-user] white balance

[Tim Rolph]

Hello, the card I use is two sided, it has white grey and black on one side 
and the standard 24 colors on the other and yes you can use Adobe DNG to 
produce a color profile for use in Lightroom and rawtherapee. However I use it 
mostly for a custom WB in camera on my 14 year old DSLR canon it is just a 
matter of taking one full frame image of the WB side of the card and then 
telling the camera to use the custom WB image. Of course you need to change 
images if the lighting changes significantly and you can also use it within dt 
with the spot wb option.
While on the subject of colour profiles I have recently used the excellent 
darktable-chart programme to create a profile and tone curve using a wolf faust 
it8 scanner calibration target that I purchased for 15.00 euros back in 2009 
and I can say it is better that any other profile that I have produced using 
any other method.

Tim.
 
On Saturday, 25 February 2017 16:10:36 GMT Remco Viëtor wrote:
> On samedi 25 février 2017 01:38:01 CET Marcus Sundman wrote:
> > Well, first we need sensible support for color cards in darktable. (Now
> > you have to go through crazy many hoops to set your whitebalance from a
> > color card, including multiple import/export and profile generation in
> > an external program and custom command line tools and whatnot.)
> 
> First you need a correctly calibrated and profiled screen (and printer if
> you plan on printing). Without that, you'd have to work strictly by the
> numbers, because there's no way you can visualise the final result. (OK, if
> you publish on the web, >90% of the viewers won't have a profiled screen,
> but at least you know how it should look)
> 
> Then, setting your white balance from a *colour* card is looking for trouble
> (if it is at all possible to get any decent white balance from such a
> card).
> 
> As has been said already, for a white balance, you need a neutral spot in
> your image: light or dark gray, but not white or black. (Such a spot can of
> course be a *neutral* spot on your colour card). Remember that 'setting the
> white balance' means changing the ratios green/red and green/blue (in
> practice, green is set to 1.0, and the red and blue channels are multiplied
> by one value each, depending on colour temperature and tint, DT _shows_
> those multipliers in the white balance module, and allows you to change
> them directly).
> 
> When you have that neutral spot in your image, in DT it's just a matter of
> choosing the "spot" mode in the white balance module and select a rectangle
> on the neutral spot.
> 
> The colour patches are used to create a *camera profile*, and yes, this
> needs an external programme (or two), just like screen or printer
> profiling. *Unlike* screen and printer profiling, it's something that's
> mostly needed for very colour critical work. (the few times I bothered with
> a camera profile, the results with a custom profile were identical or
> nearly identical to the default profile and I had no way to show which was
> better) And when you get to that level, you also have to be very careful
> about your lights all having the same colour, as the colour of the incoming
> lights influences what the camera "sees".
> 
> And just a small question: is there *any* raw developer that includes the
> possibility to generate an input profile from a colour card?
> 
> Remco
> 
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Re: [darktable-user] white balance

[Tim Rolph]

On Tuesday, 21 February 2017 16:16:30 GMT Michael wrote:
> is there something where we can take a picture of a gray card and then we
> click on it and then dt will adjust all of the colors so that the gray card
> is
> 33-33-33%?
> 
> by the way: what is the color of the remaining 1%
Anyone wanting a grey / white balance / 24 patch color card should checkout 
the following.

www.greywhitebalancecolourcard.co.uk

I have one of these and am very pleased with it and it's a fraction of the 
cost of the Mcbeth cards.


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Re: [darktable-user] darktable noise

[Tim Rolph]

My apology to all for the gaff, I did reduce the size but obviously not enough.
On Wednesday 14 Dec 2016 16:10:42 Terry Duell wrote:
> Hello Tim,
> 
> On Wed, 14 Dec 2016 14:30:08 +1100, Tim Rolph <timro...@timrolph.plus.com>
> 
> wrote:
> > Hi All, I have been playing around with the image of logic the dog a
> 
> Not good etiquette!
> Not only did you attach a large file to a post, but you posted twice!
> Probably a mistake, but a better method of providing a large image file
> (if a reduced size cannot suffice) is to make it available via Dropbox or
> similar.
> 
> Cheers,


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

[Tim Rolph]

On Thursday 08 Dec 2016 08:13:27 Robert Krawitz wrote:
> On Thu, 8 Dec 2016 12:08:52 +0100, =?UTF-8?Q?St=c3=a9phane_Gourichon?= 
wrote:
> > Here's the parameter dump:
> > * disable base curve
> > * disable profiled denoise
> > * RAW noise reduction, default parameters
> 
> RAW noise reduction, unfortunately, won't help in my case, since my
> original is a JPEG.  Shooting RAW isn't very practical at a game where
> I might shoot 2500 frames.
> 
> https://rlk.smugmug.com/Photography/DarktableRawTherapee/
> https://rlk.smugmug.com/Sports/Basketball/MIT-SarLaw-mbb-20161126/i-chq2xjG/
> A
Try NeatImage it's the best I have  found at de-noising non raw images and  
its available as a standalone on linux for free. It also makes  use of opencl 
/ cuda capabilities so it's quick.

Tim.

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