Re: [darktable-user] darktable-chart

[Patrick Shanahan]

* David Vincent-Jones  [12-08-22 21:24]:
> Using today's git version (4.1.0+1186~g4556cee4d1) on Manjjaro/Arch/XFCE I
> get:
> 
> [david@david-g5 ~]$ darktable-chart
> Segmentation fault (core dumped)
> 
> Are others seeing this problem?
> 

no,
release-4.1.0-1190-g39d46ffa1
openSUSE Tumbleweed 20221206

self compiled

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

[Victor]

Running darktable-chart from a terminal I was able to solve the problem.

darktable-chart complained that in the original cie file was presente 
the string 'SAMPLE_LOC' instead of the required 'SAMPLE_ID'. Therefore I 
changed 'SAMPLE_LOC' into

'SAMPLE_ID' in ColorCheckerPassport.cie and voilà the problem was solved!

Thanks for your suggestions.

Ciao

Vittorio

Il 25/08/20 16:18, Tim Rolph ha scritto:

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] 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] darktable-chart fails to recognize my cie file

[Victor]

I mean that when I try to load the ColorCheckerPassport.cie file nothing 
happens, the file is not loaded at all. As a consequence I cannot go on 
with the compilation.


Il 25/08/20 13:26, Matt Maguire ha scritto:
Procedure sounds right. What do you mean by "I got stuck. No way for 
the cie file to show up and go on"? Can you be a bit more specific 
about what you did and what you observed?


On Tue, 25 Aug 2020 at 21:00, Victor > wrote:


Sorry I sent the following message with incomplete re.

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 stuck. No way of the
cie file to show up and going on.

What was wrong with my procedure?

Thanks a lot

Vittorio



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

[Matt Maguire]

Procedure sounds right. What do you mean by "I got stuck. No way for the
cie file to show up and go on"? Can you be a bit more specific about what
you did and what you observed?

On Tue, 25 Aug 2020 at 21:00, Victor  wrote:

> Sorry I sent the following message with incomplete re.
>
> 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
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>


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Re: [darktable-user] darktable-chart and missing colorin "standard color matrix"

[Niccolo Rigacci]

On Fri, Jan 03, 2020 at 04:25:32PM -0800, jys wrote:
> >
> > > First of all I wonder why the dtstyle created by darktable-chart 
> > > includes the module "input color profile".
>
> Probably to make sure the input profile being used with the 
> applied style is the same one that was used to create the style 
> in the first place, otherwise the results won't be valid. Did 
> you create the style using a camera RAW file and its associated 
> "standard" color matrix?

I created the dtstyle from a regular JPEG file, not RAW image; 
I'm experimenting with scanner color balance, not camera 
profiling.

Indeed it seems that I have to deal with the "input color 
profile" of my source images. The one added by darktable-chart is 
wrong and must be replaced.

To be more clear, this is the workflow that now works:

1) Make a scan of the ColorChecker chart, open it in Darktable, 
assign the most appropriate "input color profile" (which was 
"linear Rec2020 RGB" in my case) export the image in PFM float 
format, Lab color profile.

2) Get a reference image of the same ColorChecker chart, i.e. one 
image with exactly calibrated colors. Export this image too in 
PFM float, Lab.

3) Launch darktable-chart and use image #1 as "source image" and 
image #2 as "reference values". Process the images and save the 
resulting dtstyle. NOTICE: darktable-chart will include an "input 
color profile" into the style, called "standard color matrix" 
which is indeed wrong. We will replace it later.

4) Launch Darktable, import the dtstyle created at step #3.

5) Open the image to be color balanced, apply the proper "input 
color profile" (again it was "linear Rec2020 RGB" in my case).

6) Apply the style imported in step 4 to the image and check the 
history of the image: remove the last "input color porfile" 
applied by the style. The image should now be correctly balanced.

7) Save the image history as a new style, this is the only one 
that you will apply to all other images.


Happy Color Balancing!

-- 
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Campi Bisenzio - Firenze - Italy
Tel. Mobile: +39-327-5619352

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Re: [darktable-user] darktable-chart and missing colorin "standard color matrix"

[Patrick Shanahan]

* Niccolo Rigacci  [01-03-20 07:00]:
> Hello Darktable users!
> 
> I'm playing with a ColorChecker and the darktable-chart program 
> to produce a good Darktable style to apply in my workflow.
> 
> First of all I wonder why the dtstyle created by darktable-chart 
> includes the module "input color profile". Shouldn't rather the 
> input profile be added by me, if required?
> 
> The second question is about that input color profile: it seems 
> invalid because whenever I apply the style I get the following 
> error message in the text console:
> 
> [colorin] could not find requested profile `standard color matrix'!
> 
> then I find that the sRGB colorin profile is applied indeed, 
> modifying badly the photo (too washed out!), so that I have to 
> remove it.
> 
> Do I have a bug on my Darktable installation? What is that 
> "standard color matrix" profile? My environment is:
> 
>   * Darktable 2.6.0
>   * GNU/Linux Debian 10.2 Buster

your problem may stem from version as many new features were introduced
and dt is now at 3.0 with development on 3.1+

-- 
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Photos: http://wahoo.no-ip.org/piwigo   paka @ IRCnet freenode

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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

[Marco]

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

[Marco]

On Sun, 01 Jul 2018 04:38:31 +0100
Tim Rolph  wrote:

> > 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.
> 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.

If I rename it, the “reference: it8:” field still shows “(None)”
after selecting it. So I assume it doesn't work here. You just
renamed the R123456.txt to R123456.cie and selected it as
“reference: it8”?

Furthermore, something I don't understand about darktable-chart is,
when I select the source image and the chart, the table in the
bottom of the screen fills with Lab (image) and Lab (reference)
values. I have not selected reference values, yet. Where do those
reference values come from?

Marco

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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
> 
> darktable user mailing list
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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: [darktable-user] darktable-chart

[Paul Deverson]

Thanks, Tobias.


> On 08-15-2017, at 5:03 AM, Tobias Ellinghaus  wrote:
> 
> Am Montag, 14. August 2017, 10:55:39 CEST schrieb Paul Deverson:
>> Brilliant! Thanks so much.
>> 
>> It works, but I get this warning. Does it matter?
>> 
>> (darktable-chart-bin:3588): Gdk-WARNING **: GdkQuartzDisplay does not
>> implement the monitor vfuncs
> 
> No, it doesn't matter.
> 
>> Cheers,
>> 
>> Paul.
> 
> Tobias
> 
> [...]


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Re: [darktable-user] darktable-chart

[Paul Deverson]

Brilliant! Thanks so much.

It works, but I get this warning. Does it matter?

(darktable-chart-bin:3588): Gdk-WARNING **: GdkQuartzDisplay does not implement 
the monitor vfuncs

Cheers,

Paul.




> On 08-14-2017, at 4:51 AM, parafin  wrote:
> 
> Run from the terminal the following commands:
> 
> chmod a+x /Applications/darktable.app/Contents/MacOS/darktable-chart
> /Applications/darktable.app/Contents/MacOS/darktable-chart
> 
> First one is needed only once, it was a packaging error which I fixed
> for future releases.
> 
> 
> On Sun, 13 Aug 2017 18:05:01 -0400
> Paul Deverson  wrote:
> 
>> Hi,
>> 
>> I’ve read some articles about darktable-chart and would like to try it out. 
>> 
>> How do I access it, though? I can’t find it anywhere!
>> 
>> I have darktable 2.2.5 and I run it on OS X 10.11.6.
>> 
>> Cheers,
>> 
>> Paul
>> darktable user mailing list
>> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
>> 
>> 
> 
> darktable user mailing list
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> 



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Re: [darktable-user] darktable-chart

[parafin]

Run from the terminal the following commands:

chmod a+x /Applications/darktable.app/Contents/MacOS/darktable-chart
/Applications/darktable.app/Contents/MacOS/darktable-chart

First one is needed only once, it was a packaging error which I fixed
for future releases.


On Sun, 13 Aug 2017 18:05:01 -0400
Paul Deverson  wrote:

> Hi,
> 
> I’ve read some articles about darktable-chart and would like to try it out. 
> 
> How do I access it, though? I can’t find it anywhere!
> 
> I have darktable 2.2.5 and I run it on OS X 10.11.6.
> 
> Cheers,
> 
> Paul
> darktable user mailing list
> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
> 
> 

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