Help importing raw fies from Canon 1Ds into darktable

msienko · July 5, 2025, 5:34pm

I have a set of tiff files that are raw files from a Canon 1Ds. When I import them into darktable, they appear only as if there is the small preview. I can’t see any other image data. How can I see the actual raw data?

I’ve been looking into this for a while now and am stumped.
Thanks,
-Matt

P.S. this is the output from ‘darktable --version’. I’m running the docker version from linuxserver.io

darktable 5.2.0
Copyright (C) 2012-2025 Johannes Hanika and other contributors.

Compile options:
Bit depth → 64 bit
Debug → DISABLED
SSE2 optimizations → ENABLED
OpenMP → ENABLED
OpenCL → ENABLED
Lua → ENABLED - API version 9.5.0
Colord → ENABLED
gPhoto2 → ENABLED
OSMGpsMap → ENABLED - map view is available
GMIC → ENABLED - Compressed LUTs are supported
GraphicsMagick → ENABLED
ImageMagick → DISABLED
libavif → ENABLED
libheif → ENABLED
libjxl → ENABLED
LibRaw → ENABLED - Version 0.22.0-Devel202502
OpenJPEG → ENABLED
OpenEXR → ENABLED
WebP → ENABLED

Donatzsky · July 5, 2025, 6:12pm

What happens when you double-click the thumbnail or press D when it is selected?

msienko · July 5, 2025, 6:51pm

In darkroom view, I just see the low-resolution preview. I can’t figure out how to get to the actual raw data.

Donatzsky · July 5, 2025, 6:52pm

Can you share a file here?

Donatzsky · July 5, 2025, 7:17pm

Just tested with the sample from raw.pixls.us and if you change the extension to .crw or .cr2 (not sure which is more correct), darktable opens it just fine.

msienko · July 5, 2025, 7:54pm

That works, thanks! I changed the extension from .tif to .cr2 and it imports as expected. I’ve been pulling my hair out trying to figure this out and the simple solution was in front of me the whole time.

Thanks again!
-Matt

Peter · July 5, 2025, 8:50pm

Seems like something happend since darktable 4.8. I am running 5.0.1 with the same error. darktable is picking the thumbnail instead of the raw image from the tif file.

Changing in darktablerc

libraw_extensions=tif

work for most images, but sometimes the same image doesn’t work one time but works the next time…

This image worked 1 minute ago. I had to restart darktable to get it to work again.

Issue here Canon EOS 1Ds TIF broken in rawspeed · Issue #870 · darktable-org/rawspeed · GitHub

Peter · July 10, 2025, 7:13am

See this.

github.com/darktable-org/darktable

[imageio] Fix loading of RAW files misidentified as TIFF and TIFF files misidentified as RAW

master ← victoryforce:fix-19046

opened 08:42PM - 08 Jul 25 UTC

victoryforce

+8 -3

We have two "opposite" problems with incorrect identification of file formats: … 1. Files that are actually raw files from cameras, but due to a strange decision of the manufacturer have the extension .tiff and can be read as TIFF files. In this case, we will read a small thumbnail of the actual shot from the camera. Example: #19046 1. Files that are actually TIFF files (created from raw files), but due to oversight of the programs that create these files, they leave bytes from input files there, which when matching signatures force us to mistakenly decide that this is a raw file. Example: #17738 This PR reverts the previous fix for the second problem, since the regression from this fix (#17742) led to the first problem. After that, the second problem is solved in a different way (by changing the return code to call the fallback loader).