How to contribute to libraw?

Software
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As the forum there seems to be semi-alive and I can’t find a way on how to contribute, I am asking here. I used the Adobe DNG converter and a raw file from https://www.dpreview.com/samples/4066714833/canon-eos-r5-ii-pre-production-sample-gallery to extract the R5mk2 color matrix in preparation of my camera and adding support for darktable.

I am looking at this PR to get an idea what needs to be contributed for new camera support: Add support for Canon EOS R50 by robekl · Pull Request #634 · LibRaw/LibRaw · GitHub The cameraID I cant figure out how to retrieve. Where do I get the unsigned long variable name in whatever format from the exif tags or some string conversion tool? Can’t be that hard but I can’t seem to figure it out by myself. Most likely some “Canon EOS R5 Mark II” / “Canon EOS R5m2” string conversion. Are external contributions even encouraged?

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You can’t really contribute camera support to LibRaw, they will do it on their own schedule: About LibRaw | LibRaw

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I don’t really understand. What does the release schedule have to do with accepting PRs?

So their github is just a read only show? Explains a bit why there is no info on how to contribute.

But let’s just assume I want to change the submodule to support the raw files early, I still need to get the cameraID correct

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Exiftool is your friend.

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thanks, I looked over the tags several times but must have missed the Canon Model ID one.

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I remember rawspeed needing the white and black values according to ISO values. Are those read from exif tags for cr3 based cameras in darktable?

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Well, as with any public Github repo, there’s an Issues tab and if you have a Github account you can open an issue.

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thanks, I know. When starting with contributing to darktable and lensfun the experience was, mildly put, not so nice so this time I’d rather ask and or be prepared…

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You might go to libraw.org and post a query on their forum…

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I did, it’s stuck in the review queue that’s why I came here as @kmilos and other people have libraw experience

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So I changed all files in libraw submodule and in imageio_libraw in darktable yet it does still not want to read the image data and tel sme it’s unsupported. I’ll continue tomorrow.