Leaf AFi-II 12

[DawidLoubser]

I uploaded a RAW sample back in 2022, and just uploaded another (better) sample of a detailed daytime landscape full of fine texture.

I believe this same back, not bundled with camera as "AFi", would be identified as Aptus-II 12 / Aptus-II 12R (same hardware, same files).

For reference: RawTherapee supports these files already, and I have to imagine they are similar to other Leaf backs, older ones of which Darktable already supports.

I've contributed some noise profiles before (e.g. for the Leica SL, Nikon D3S) and will do the same for the Leaf AFi-II 12 once basic demosaicing support is available.

[kmilos]

I believe this same back, not bundled with camera as "AFi", would be identified as Aptus-II 12 / Aptus-II 12R (same hardware, same files).

You don't have access to these Aptus backs by chance? I ask because the ADC refuses to convert the "AFi" sample from RPU (not in the supported list indeed), and I was hoping to gain some insights from the Aptus-II 12 raws that supposedly are supported.

[DawidLoubser]

I wish, but afraid not - I only have access to my single back branded as "Leaf AFi-II 12" but I am extremely certain that the only difference is the model name in the EXIF, it's the exact same back (anecdotally).

I'm just really really keen on getting my dear old back supported in Darktable.

AFi-II 12 and Aptus-II 12 are completely interchangeable, it was purely their product naming strategy for with their "own" (Rolleiflex Hy6) camera vs. stand-alone back fitting on other cameras.

[kmilos]

I am extremely certain that the only difference is the model name in the EXIF, it's the exact same back (anecdotally).

Hm, not so sure anymore: Adobe lists Aptus-II 12 as supported, and the following caveat:

Camera Raw does not support compressed MOS & IIQ files from Leaf cameras. If you cannot open your MOS or IIQ files in Camera Raw, try using a camera proprietary converter to remove the file compression.

which makes me think the Aptus backs store the uncompressed MOS, while the AFi flavor is (unsupported) compressed. The one sample (your old one?) on RPU indeed says this is compressed (type 99), and it is unfortunately not currently supported by RawSpeed.

[DawidLoubser]

Interesting that RawTherapee supports the Leaf AFi-II 12 back then!
And there is definitely some compression going on yes, file sizes vary between ~70MB and ~100MB depending on subject matter.

[kmilos]

It is using LibRaw as backend. You can also force dt to use LibRaw for some raw file types (search the issues here or discuss.pixls.us for libraw_extensions), but be warned that is an unsupported workaround (i.e. you're on your own). 😉

[DawidLoubser]

@kmilos Thank you for triaging this so quickly. Is there any way that I can help?
I am actually a software engineer, I have just never dug into raw decoding or the darktable codebase.
Thank you for the tip about LibRaw, I'll definitely look into it!
I won't complain if support is imperfect at the moment, I'm just looking for some sort of avenue forward to use my favourite camera and favourite raw developer together.

[DawidLoubser]

@kmilos I'm getting somewhere with libraw_extensions but it's rendering only part of the image and pops up a color matrix not found! error. And advice? I'm happy to mess around with trying to configure a working colour matrix.

[kmilos]

Is there any way that I can help?

AFAIK there are no plans to keep extending the current RawSpeed codebase.

[DawidLoubser]

Funny enough, Darktable does not display the metadata for the image at all (no camera make / model) but Exiftool does, i.e. for this particular image I posted above:

$ exiftool L_002486.mos | grep Leaf
Make                            : Leaf
Camera Model Name               : Leaf AFi-II 12(LI600083   )/Leaf AFi
Leaf Auto Active                : 0
Leaf Hot Folder                 : 11.0.7/
Leaf Output File Type           : 0
Leaf Auto Base Name             : L
Leaf Save Selection             : 0
Leaf Open Proc HDR              : 0
Std Hot Folder                  : /Volumes/Extra/LeafProjects(XCode)/Development/LeafCapture10
Camera Type                     : Leaf AFi

[kmilos]

And advice? I'm happy to mess around with trying to configure a working colour matrix.

Apart from debugging actual LibRaw decoding and https://github.com/darktable-org/darktable/blob/master/src/imageio/imageio_libraw.c, no, sorry.

FWIW, LibRaw's unprocessed_raw tool decodes the RPU sample just fine, so I was hoping it would simply work out...