Please update OpenEXR to 3.4. OpenEXR-3.3 is very slow when opening images exported to gimp-3.2 rc2

[john-k-h]

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

I use both linux and win11. The win11 is mainly for testing gimp/darktable. Using windows-gimp, darktable is called to open raw files, and in my case, nef files. Darktable has no issue opening the files and exporting them to windows-gimp. Windows-gimp cannot find the exported file (I'm not reporting on that issue because in windows, I find the exported exr file in my home directory) but I can open it manually. Gimp-3.2 rc2 is very slow to open the exr image... taking approximately 40 seconds.

I've noticed that windows-gimp uses openexr-3.4, and windows-darktable uses openexr-3.3.

If I use linux-gimp to open the exr file exported by windows-darktable, linux-gimp runs like it is windows-gimp, meaning very slowly. If I use windows-gimp to open an exr file exported by linux-darktable (I'm using openexr-3.4 in linux) the the file opens quickly enough.

I suspect if your Windows build of darktable would use openexr-3.4, the file loading problem would go away. I believe there was a problem in the openexr-3.3 code that was making the slow problem in linux-gimp, and when openexr was updated to 3.4 the slowness issue vanished.

Steps to reproduce

1. Open windows-gimp and open a RAW file. Gimp passes the file (exr in this case) to windows-darktable, and windows-darktable passes the file back to windows-gimp.
2. Windows-gimp takes a long time (40 or more seconds) to open the exr file.
3. I suspect that the problem is related to openexr-3.3 in windows-darktable.

Expected behavior

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Logfile | Screenshot | Screencast

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Commit

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Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.4.0

What OS are you using?

Windows

What is the version of your OS?

Windows 11 home

Describe your system

Gigabyte motherboard running intel 10 gen 16 core chip.

Nvidia GPU 3060

64 GB of ram

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Nvidia RTX 3060 ti 8 GB of ram.

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response