Could you please upload one of your RAW image files?
Thank you!
Now, I am back after having had a good dinner 
This might be a depressing piece of news, but your .NEF opens perfectly well in
- darktable
- RawTherapee
- Art
under Linux Manjaro/KDE.
Since you use another operating system, it sounds as if your problem might have something to do with that specific implementation…
Sincerely,
Claes in Lund, Sweden
Thank you Clae
I hope another darktable windows user open my file and remarks the result.
Stam
Chios Greece
I see the same problem using the flatpak of 3.0.1. I bet it is a rawspeed version issue.
@LebedevRI, can you provide any insights here?
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It’s not supported in 3.0.x because no one propagated support there.
Ask stable branch maintainer for more details.
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hi, I having similar problem.
I have windows 10, darktable 3.0.2
the message is: Nikon Z 50 color matrix not found.
If I import my or siliadakis .NEF raw file I see some colors (it is normally bright) in light room, if I open file in dark room and do any edit I will loose colors and brightness.
Hello, all. I’m a long-time Darktable user (though by no means an expert) but am new to version 3.01 and to my Nikon Z 50. I’ve been following this thread and wanted to share my experience.
I’m running on Pop OS 20.04 LTS Linux zjc_0302.nef (23.0 MB) (an Ubuntu variation) and using Darktable 3.01.
I, also, get the ““loading image” error. I can see thumbnails of my NEFs but the images will not load in the lighttable.
Attaching a file…
Nikon Z50 basic support was released with darktable 3.0.2. So, probably Pop OS is a bit outdated there.
Thanks, Olivier. I knew version might play into it but had been unable to find a definitive statement of when Z 50 support was granted. Appreciated.
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Upgrading to 3.02 took care of it. Thanks, all.
Got version 3.1.0~git1880.268670c25 and can open the file without problem.
You are right. I can use the darktable 3.02 with z 50 ’ nefs. Thank you all for the support.
Στις Τρί, 2 Ιουν 2020, 10:11 μ.μ. ο χρήστης pphoto via discuss.pixls.us noreply@discuss.pixls.us έγραψε:
Hey, I’m also using 3.02 and it still shows colour matrix not found. Did the update sort it out on Windows?
Good news - darktable 3.2.1 was just released and now it can open Z50 raw files. I’ve tested and the files open with no issues so far
Happy now
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Hello,
I have recently bought a nikon Z50. It works wel with darktable.
I see there is only standard color matric and not the enhanced one.
Do you need some sample of a color-checker to improve the support ? (documentation available ?)
@Amaury_De_Ganseman Welcome to the forum!
As you can see above, support has very much to do with the version. Which version of dt are you using? Where did you get it from? And what is your OS? The more info the easier it is for us to help you.
Documentation can be found here: resources | darktable.
The standard colour matrix is a reasonable compromise for a varied shooting conditions. The enhanced colour matrix is mainly of benefit if you are doing a lot of shooting in a studio or under some other situation with controlled lighting. In such cases, you can make a custom profile your sensor under that specific illuminant, and use it for the input profile. Is it really worth embedding such a custom profile into the darktable code? Maybe some of the devs here might comment, but I see that the majority of cameras are just using the standard matrix coefficients used by Adobe.
@afre thanks !
I’m using DT 3.2.1 on linux (Opensuse).
I have no problem just asking if I can help to improve support for the Z50 as I have one.
@Matt_Maguire WHen you say standard matrix, it’s a matrix for the Z50 ? Or the same for all DSLR ?
There’s one other situation where the matrix profiles fall short, extreme colors. In that case, I think darktable now has tools to pull those into better gradation for rendering in smaller colorspaces.
But for images without such challenges, the matrix profile is probably preferable as it, with a relative colorimetric transform intent, does a more linear translation of the camera measurements into renderable colors.
Disclaimer: Color Mechanic here, not a card-carrying Color Scientist… 
1 Like