Noise Profiles for Nikon Df

[grudgingly]

Attached is a noise profile tarball for the Nikon Df.

Note that to get the script to run, I made two changes to /usr/lib/darktable/tools/subr.sh:

Changed line 269 to iso=$(exiv2 -Pt -K Exif.Photo.ISOSpeedRatings "$file")
and changed line 272 to iso=$(exiv2 -Pt -K Exif.NikonIi.ISO "$file")

As shipped the script would fail with errors like (from memory): Found ISO 0 0 0 0 file... bad substitution.

The resulting ISO numbers are the same as Darktable shows when opening the files, so it should be ok.

I actually ran the process four times (at different apertures) and the graphs in this one look the "least crazy" to me. But I don't know how to interpret them, so I'll attach the other results in a separate comment below.

darktable-noiseprofile-20251213.tar.gz

[grudgingly]

Here are the tarballs from the other runs, for completeness:

darktable-noiseprofile-20251213-run1.tar.gz

darktable-noiseprofile-20251213-run2.tar.gz

darktable-noiseprofile-20251213-run3.tar.gz