I want to announce my small project. It’s a raw to dng file format converter, written in Rust.
It currently supports only CR3 raw files (ironic, I know), because that is what I need most. But I want to add as many other formats as possible. It’s in alpha stage, so don’t expect a bug-free ready-to-use application, but for those of us dealing with CR3 raw files it may already help . You have to build it from source, there are no binary packages yet.
All Canon cameras with CR3 format are supported (R, RP, R5, M50, …) except of CRAW (compressed RAW) files. For a general state of CR3 support please have a look at dnglab/CR3_STATE.md at main · dnglab/dnglab · GitHub.
I would be happy if I receive some feedback so I can priorize the next changes/features, as all my urgent wanted features are now implemented.
One big thing currently missing is EXIF lens detection, but that is number #1 on my todo list
Autobuilds for releases should work now. I’ve added a debian and windows package at Releases · dnglab/dnglab · GitHub
Hope this works. It’s alpha-ware, folks
I remember DNG conversion beeing added to digiKam way back. I see now it was in 2008. I have never used digiKam though. Could someone confirm whether it’s still there and works?
Hi Daniel, great to see you activating the autobuild however I have a problem when trying to install the .deb package:
(base) 17:20:41 aadm@psion:~/Downloads$ sudo dpkg -i dnglab_v0.1.0-alpha1_amd64.deb
dpkg: error processing archive dnglab_v0.1.0-alpha1_amd64.deb (--install):
parsing file '/var/lib/dpkg/tmp.ci/control' near line 2 package 'dnglab':
'Version' field value 'v0.1.0-alpha1': version number does not start with digit
Errors were encountered while processing:
dnglab_v0.1.0-alpha1_amd64.deb
This is the error when using apt instead (I’m adding this in case it gives some extra information that may be useful for you):
(base) 17:26:12 aadm@psion:~/Downloads$ sudo apt install ./dnglab_v0.1.0-alpha1_amd64.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'dnglab' instead of './dnglab_v0.1.0-alpha1_amd64.deb'
The following NEW packages will be installed:
dnglab
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/884 kB of archives.
After this operation, 2.793 kB of additional disk space will be used.
Get:1 /home/aadm/Downloads/dnglab_v0.1.0-alpha1_amd64.deb dnglab amd64 v0.1.0-alpha1 [884 kB]
dpkg: error processing archive /home/aadm/Downloads/dnglab_v0.1.0-alpha1_amd64.deb (--unpack):
parsing file '/var/lib/dpkg/tmp.ci/control' near line 2 package 'dnglab':
'Version' field value 'v0.1.0-alpha1': version number does not start with digit
Errors were encountered while processing:
/home/aadm/Downloads/dnglab_v0.1.0-alpha1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Daniel, the executable now works but I have found a few problems in some of the CR3 I’ve converted. Darktable does not recognize some of the converted dngs, while the conversion via Adobe dng converter works fine.
If you want to check this out I’ve put here one example: the original cr3 plus the two converted dng (the one via dnglab is the larger one, ~65 Mb with .DNG as suffix; the one converted with Adobe is ~28 Mb and suffix .dng):
you made my day,
Thanks for sharing your work with us!
I just got my new EOS and realized: I 'll have to adjust my workflow “a little bit” because of the new raw format Canon introduced It seems that your “little” project is the only option for me converting cr3 to dng on linux since the latest version of the Adobe converter doesn’t play along with wine at the moment.
I successfully tried your converter yesterday and it run trough smoothly.
I loaded the resulting dngs (with various flags set) and the original cr3 to rawtherapee and noticed huge differences between the color histograms - Should that be this way?
You refer to the Processing Profiles in RawTherapee?
I compared the cr3 raw with 2 dngs converted from the raw, each with different flags set in DNGLab.
The RGB histograms show slight but recognizable differences. I don’t think they are originated by simple shifting or warping of the curves, because the peaks or low points are set at different parts of the curve (but i could be wrong of course due to my little experience with RT ).
I also tried different Processing Profiles one after another and cursory compared the settings for tone mapping / color curves, etc. every time. I couldn’t find any different values.
AuntEdithSaid:
The question is, if this observed behavior is a result of the conversion process or is it originated in my RT settings.
. You have to build it from source, there are no binary packages yet.
It seems that your “little” project is the only option for me converting cr3 to dng on linux since the latest version of the Adobe converter doesn’t play along with wine at the moment. 
).