Noise profile submission: Leica M9 / M-E"

[ToddSch1979]

darktable-noiseprofile-20260401.tar.gz

Hi darktable team,

I'm submitting noise profiles for the Leica M9 / M-E (Typ 220). Both cameras share the same Kodak CCD sensor, so this profile applies to both bodies.

Profile details:

• Camera used for profiling: Leica M-E (Typ 220)
• EXIF model string: "M9 Digital Camera"
• ISO range covered: 80, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500
• Frames per ISO: 5 (averaged)
• Generated with: darktable 5.4.1
• Platform: Ubuntu 22.04 (Docker)

Notes:

• Shot on a defocused screen gradient with clipping highlights to ensure accurate Poisson noise calibration
• The M9 and M-E share identical sensors — this profile should ideally be listed under both model strings
• The CCD noise character differs significantly from CMOS — the b coefficients reflect the shot-noise-dominant behavior of the sensor at higher ISOs
• In practice, good results required strength ~3.45 and preserve shadows ~0.46 in wavelets mode with Y0U0V0 color mode — this may be worth noting for users as a starting point given the CCD sensor's distinctive noise signature

Tarball attached: darktable-noiseprofile-20260401.tar.gz

Happy to reshoot any ISOs if the maintainers spot anything off in the fitted curves. Thanks for the great software.

[kmilos]

EXIF model string: "M9 Digital Camera"

One small side note: I think the model should be just "M9" as we 'normalize' it via rawspeed... (Same for the "name" entries and comment.)

(The noise profile script rudimentary normalizes the maker strings, but not so much the model ones.)

this profile should ideally be listed under both model strings

As you found out, the M-E identifies itself as M9 in Exif metadata as well, so that should be sufficient for automatic detection to work in both cases.