sudden skeleton head on hundreds of my pictures

Software darktable
1

Hi, upgraded to 4.2.1 (flatpak) from 3.8.1 (system) on Linux Mint 21.1
Suddenly, hundreds of pictures taken in 2011-2012 show the skeleton heads. All of them have been taken with Nikon D3100 et Nikon lens AF-S DX VR 16-85. What is weird is that many others (more recents) taken with exactly the same lens and camera show correctly (both Light table and darkroom). According to the doc, theses gears are fully supported,
I tried to remove these pictures in problem (with “remove”) and re-add to the library : same problems. I can open the problematic NEF with “image viewer” (although it must use only the embedded jpeg I assume)

Can you help me to recover those precious pictures ? Thanks !

2

Can you post an example image that isn’t working?

I assume your flatpak disk access is working correctly? You might want to check with flatseal

3

Flatpacks run in a sandbox. User applications running with Flatpak need the user’s permission to access foreign files outside the sandbox or on the hardware.

4

right. But many other images can be accessed successfully with the same gear, so it does not appear to be a permission problem. But just in case of, I tried to add “home” access, which is where are located the pictures in problem (AND those that behave correctly). “Home” was not checked by default, so I checked it (see picture of Flatseal). Strange because I have thousands of pictures in “home” and it was working perfectly well before the “check” of home…Anyway…I then restarted darktable but same problem.

image
image1208×870 50.3 KB

5

Good, just wanted to start troubleshooting from step 1.

Can you post a problem image?

6

yes : Proton Drive

7

As additional info, I have tried on a different computer , brand new install of Mint 21.1 and Darktable 4.2.1 flatpak. No image in the library up to now. Set the images permissions to rwxrwxrwx. Imported the image : same problem.

And interestingly, I can fully open the file with RawTherapee 5.9 Flatpak. So the problem appears to be with Darktable 4.2.1

8

Did you at any point use the Nikon transfer software with these files? Or use any program that edited the raw data?

9

I dont remember having done so (maybe, maybe not…). I think it was working with 3.8.1 “system” (these are not pictures I look at regularly).

At the terminal, if I type “dcraw -i -v name_of_the_file”, it works and I get this (dcraw 9.28):

Filename: tempo.NEF
Timestamp: Wed Dec 29 20:11:02 2010
Camera: Nikon D3100
ISO speed: 640
Shutter: 1/25.0 sec
Aperture: f/5.6
Focal length: 85.0 mm
Embedded ICC profile: no
Number of raw images: 1
Thumb size:  4608 x 3072
Full size:   4672 x 3084
Image size:  4644 x 3084
Output size: 4644 x 3084
Raw colors: 3
Filter pattern: GB/RG
Daylight multipliers: 2.238689 0.933825 1.006643
Camera multipliers: 527.000000 256.000000 265.000000 256.000000

Is there any logs I can provide ? Config ? thx for your help !

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