Rawtherapee: CR3 decoding support (metadata support needed)

[Beep6581]

There is an increasing number of cameras using the Canon Raw v3 (CR3) format. This issue is about adding support for decoding CR3 in RawTherapee, regardless of specific camera model.

CR3 specification:
https://github.com/lclevy/canon_cr3

[miguel-porto]

Hi, how is the progress of this feature? Desperately needing it... ;-)
BTW, congrats on this great piece of software!

[Thanatomanic]

@miguel-porto There has been more discussion on the subject recently. See here: https://discuss.pixls.us/t/not-yet-canon-raw-files-cr3-recognised-by-rawtherapee/14042
If you desperately need it, you may opt to contact Canon yourself: https://discuss.pixls.us/t/canon-cr3-raw-support-your-move/14192

[miguel-porto]

Oh, didn't know the problem was still at that level, sorry. Just came across this issue first. Thanks for the clarification.

[albfe]

Hello, it looks like the new snapshot of LibRaw supports CR3!
https://www.libraw.org/news/libraw-snapshot-201910
Code should be available in their Github repo :)

[Beep6581]

Commit 0cf3f16df adds basic CR3 decoding support. Metadata is not supported yet.

[albfe]

Thanks a lot for the effort: it works!
Of course it is not yet usable, without metadata support, but I guess it will be coming with time :)

Thanks again!

[heckflosse]

@albfe We started work on it today. Porting the code to decode the files was easy. Give us some time for the remaining parts (Metadata...)

[albfe]

@heckflosse , I completely understand and my intention was not to criticize, but rather to thank you for having started working on this. Sorry if we misunderstood. My note about metadata was for other possible users that are waiting for cr3 support, so that they don't expect it is fully usable right now, just that.

BTW, even EOS R crop seems to be working well.

[Krijger]

Should I expect to see CR3 files already? I built the code for Mac OS (including the latest cr3 related commit from dev) and am not seeing the CR3 files in the File Browser.

[heckflosse]

@Krijger Is CR3 enabled in preferences?

[Krijger]

@heckflosse hmm, it's not even in the list

[Krijger]

I checked my app contents for files in it that might explain this, it may have to do with the following file tree.

└── Contents
    │   ├── share
    │   │   ├── mime
    │   │   │   ├── image
    │   │   │   │   ├── bmp.xml
    │   │   │   │   ├── x-bzeps.xml
    │   │   │   │   ├── x-canon-cr2.xml
    │   │   │   │   ├── x-canon-crw.xml

I got the mime from shared-mime-info (installed with homebrew), (EDIT) which apparently does not yet know about CR3 https://gitlab.freedesktop.org/xdg/shared-mime-info/blob/master/freedesktop.org.xml.in#L4753, so I wonder where your installation gets the option from. What package installs the correct mimes ?

[heckflosse]

@Krijger Just add cr3 to the list

[Krijger]

Thanks! I actually looked for an option like that, but completely missed the preference pane not completely being shown (I scrolled the extension list, and missed the scrollbar on the outer panel). This may be a Mac OS GUI issue, because I think it should be displayed completely by default?

I can confirm that this works.

[heckflosse]

Full CR3 support will not be possible for 5.8 => change milestone to 5.9

[Beep6581]

Clarification: metadata support is missing.

[Benitoite]

I checked my app contents for files in it that might explain this, it may have to do with the following file tree.

└── Contents
    │   ├── share
    │   │   ├── mime
    │   │   │   ├── image
    │   │   │   │   ├── bmp.xml
    │   │   │   │   ├── x-bzeps.xml
    │   │   │   │   ├── x-canon-cr2.xml
    │   │   │   │   ├── x-canon-crw.xml

share/ should be in a folder called Resources/ under Contents/

[mart-w]

I just realised that exiftool supports reading and writing metadata to and from CR3 files. Is this something that could be utilised for RawTherapee, as well?

[SchoolGuy]

I am getting started on photography with my new EOS RP. Is there anything I can do to help to get the metadata support in RawTherapee? I looked at the list of pictures which are required and I didn't find my camera so I suspect that all files needed are already provided? I would love to help as I really would prefer using an open-source-tool against the propitiatory tool from Canon... (Also this runs under Linux in contrast to the Canon Tool.)

[noirsabb]

Hi

I am trying to upload a bunch of white frame files for a 1DX Mark III (which I have access to for a while), however uploading the zipped file to filebin (about 460MB) continually fails. There was a note about uploading the file to another site, but the name of that site currently escapes me. If someone can let me know of that site, please let me know.

[Thanatomanic]

@noirsabb would it help to divide the files in a couple of separate zip files and upload those to filebin?
Also, if you're looking for specific support for your camera in terms of white levels, please open a new issue.

[noirsabb]

@Thanatomanic unfortunately upload fails after a few seconds.

As to support for CR3 files, unfortunately as yet RT (dev, version: 5.8-2375-g6b749bcbf) displays CR3 files produced by the camera as white or washed out, although the thumbnails look OK. I can work with the raw white points to get some detail, but the results cannot be used. I followed a hack in another thread setting bpp (?) in dcraw.cpp (?) to 14, and was able to get something to work with, although I am aware CR3 support is in progress. Issue #5319 no longer encompasses (general) CR3 decoding? I will create a new one if you like.

[Thanatomanic]

CR3 decoding is working in general. I think it is better to open separate threads for specific camera's to make sure the camconst.json values are populated so that the colours become correct.