I apologize in advance as my understanding of DNGs is very poor, but I thought that building the Adobe DNG SDK and building libraw with USE_DNGSDK and libjxl would allow it to unpack my phone's DNGs.

However, perhaps I was mistaken as it still complains "Unsupported file format or not RAW file" when I tried to open it with ImageMagick or the mem_image sample.

I published a reproducable repo here: https://github.com/PseudoResonance/immich-base-images/tree/dng

run-dng-test.sh contains the necessary Docker build command to compile the image up to the libraw stage, then runs a test script to execute mem_image on the provided sample image. (Note the sample image is just one I found online that seems similar to my phone image and exhibits the same issue.)

The build scripts are under server/sources and shows how libjxl, libdng and libraw were built.

Here's the full identify output on the image.

0.619 Filename: ../../testfiles/_A7F9420-HDR.dng
0.619 Timestamp: Thu Sep 19 18:56:11 2024
0.619 Camera: Sony ILCE-7M4 ID: 0x0
0.619 Normalized Make/Model: =Sony/ILCE-7M4= CamMaker ID: 63
0.619 UniqueCameraModel: =Sony ILCE-7M4=
0.619 RawDataUniqueID: =b����K�%g��_�=
0.619 DNG Version: 1.7.0.0
0.619
0.619 EXIF:
0.619 MinFocal: 24.0 mm
0.619 MaxFocal: 70.0 mm
0.619 MaxAp @MinFocal: f/2.8
0.619 MaxAp @MaxFocal: f/2.8
0.619 CurFocal: 37.0 mm
0.619 MaxAperture @CurFocal: f/2.8
0.619 FocalLengthIn35mmFormat: 37 mm
0.619 LensMake:
0.619 Lens: FE 24-70mm F2.8 GM
0.619
0.619
0.619 Makernotes:
0.619 DriveMode: -1
0.619 FocusMode: -1
0.619 MeteringMode: -1
0.619 AFPoint: -1
0.619 ExposureMode: -1
0.619 ExposureProgram: -1
0.619 ImageStabilization: -1
0.619 Lens:
0.619 LensFormat: 0, LensMount: 0, FocalType: 0, Undefined
0.619 LensFeatures_pre:
0.619 LensFeatures_suf:
0.619 MinFocal: 0.0 mm
0.619 MaxFocal: 0.0 mm
0.619 MaxAp @MinFocal: f/0.0
0.619 MaxAp @MaxFocal: f/0.0
0.619 MinAp @MinFocal: f/0.0
0.619 MinAp @MaxFocal: f/0.0
0.619 MaxAp: f/0.0
0.619 MinAp: f/0.0
0.619 CurFocal: 0.0 mm
0.619 CurAp: f/0.0
0.619 MaxAp @CurFocal: f/0.0
0.619 MinAp @CurFocal: f/0.0
0.619 TeleconverterID: 0
0.619 Teleconverter:
0.619 AdapterID: 0
0.619 Adapter:
0.619 AttachmentID: 0
0.619 Attachment:
0.619
0.619 ISO speed: 6400
0.619 Shutter: 1/500.0
0.619 Aperture: f/3.5
0.619 Focal length: 37.0 mm
0.619 Flash exposure compensation: 0.00 EV
0.619 Embedded ICC profile: no
0.619 Baseline exposure: 1.350
0.619 Number of raw images: 1
0.619 Thumb size: 256 x 171
0.619 Full size: 7008 x 4672
0.619 Image size: 7008 x 4672
0.619 Output size: 7008 x 4672
0.619 Image flip: 0
0.619 Raw colors: 3
0.619 Highlight linearity limits: 32768 32768 32768 32768
0.619 Makernotes WB data: coeffs EVs
0.619 As shot 2.2002 1 1.56738 0 1.14 0.00 0.65 0.00
0.619
0.619 Camera2RGB matrix (mode: 1):
0.619 1.6361 -0.4486 -0.1874
0.619 -0.1152 1.4890 -0.3738
0.619 -0.0047 -0.3236 1.3283
0.619
0.619 XYZ->CamRGB matrix:
0.619 0.7460 -0.2365 -0.0588
0.619 -0.5687 1.3442 0.2474
0.619 -0.0624 0.1156 0.6584
0.619
0.619 camRGB -> sRGB Matrix:
0.619 1.6361 -0.4486 -0.1874
0.619 -0.1152 1.4890 -0.3738
0.619 -0.0047 -0.3236 1.3283
0.619
0.619 DNG Illuminant 1: Illuminant A
0.619 DNG Illuminant 2: D65
0.619 DNG color matrix 1:
0.619 0.8784 -0.4791 0.1177
0.619 -0.3468 1.0693 0.3213
0.619 0.0009 0.0507 0.7395
0.619
0.619 DNG color matrix 2:
0.619 0.7460 -0.2365 -0.0588
0.619 -0.5687 1.3442 0.2474
0.619 -0.0624 0.1156 0.6584
0.619
0.619 DNG calibration matrix 1:
0.619 0.9988 0.0000 0.0000
0.619 0.0000 1.0000 0.0000
0.619 0.0000 0.0000 0.9641
0.619
0.619 DNG calibration matrix 2:
0.619 0.9988 0.0000 0.0000
0.619 0.0000 1.0000 0.0000
0.619 0.0000 0.0000 0.9641
0.619
0.619 DNG forward matrix 1:
0.619 0.4743 0.3796 0.1104
0.619 0.2023 0.7673 0.0304
0.619 0.0553 0.0008 0.7690
0.619
0.619 DNG forward matrix 2:
0.619 0.5465 0.2614 0.1563
0.619 0.3232 0.6292 0.0475
0.619 0.1339 0.0025 0.6887
0.619
0.619 Derived D65 multipliers: 2.450757 0.931928 1.341527