Please devs, don’t forget LibRaw RD & FRV can open 1DX3 .cr3 files, and has been able to do so for the last 7 or 8 months:
It’s slightly irritating that RTdev can open certain later cr3 files but not these.
I was going to post this on the previous thread but it’s locked.
Hi @Andy_Astbury1, see Canon EOS 1DX Mark III CR3 Raw Support · Issue #5862 · Beep6581/RawTherapee · GitHub
Maybe this can be useful?
{ // Quality C
"make_model" : "CANON EOS-1D X MARK III",
"raw_crop": [ 72, 38, 5496, 3670 ],
"masked_areas" : [ 40, 10, 5534, 70 ],
"ranges" : { "white" : 16383 }
},
It works, indeed! 
Hmm, was there a problem with the colorchecker shots provided, or did generating the DCP just fall through the cracks?
@agriggio Many thanks! Based on analysis of the white frames provided in the referenced issue, I have put the white maximum at 16382 instead of 16383.
See Update camconst.json with basic support for Canon EOS-1D X M3 · Beep6581/RawTherapee@d36545b · GitHub for the commit.
@Entropy512 I have asked @Morgan_Hardwood to generate the DCP’s. I know how to do it as well, but he has previously expressed the wish to keep making those.
Yeah, I have done DCPs myself but, yeah - I know he prefers to do those himself.
There’s no metadata support for CR3 files in RT yet, though it is coming soon. (If you can’t wait, you can try ART in the meantime…)
