no date /time taken shown for Leica M8 DNG files in File Browser

mnsh · March 27, 2019, 2:43pm

Apologies if this is already covered, I am new here and searching on this exact question did not find any answers, nor in RawPedia.
I have been starting to explore the use of RT5.5 on Ubuntu 18.04 but am finding that there is no date imported with my DNG files from M8 camera

so I can’t see the photos in the order that I took them (I use two cameras with different lenses) as all from one camera start 100… and the other camera 200… But date / time taken shows fine with JPEG files from my D-Lux 4
Is this a known issue or have I made a mistake somewhere and there is a setting I can adjust to show pictures in order of Date Taken?
Thanks, Matthew

floessie · March 27, 2019, 2:54pm

Hi Matthew and welcome!

If you provide a sample file that exhibits the problem (preferably via https://filebin.net/) we can have a look.

Best,
Flössie

heckflosse · March 27, 2019, 2:56pm

Confirmed using this dng https://raw.pixls.us/getfile.php/2988/nice/Leica%20-%20M8%20-%208bit%20uncompressed%20(3:2).DNG

mnsh · March 27, 2019, 5:06pm

Thank you, Ingo, this looks very much like a DNG that I submitted for analysis earlier this year - Cathedral square in Dornoch, Scotland

mnsh · March 27, 2019, 5:12pm

thanks Flossie
this is the one in my screenshot - view of Scottish hills and fresh gorse
https://filebin.net/rohxrhm8gen43si6
Matthew

floessie · March 28, 2019, 7:54am

Issue created:

github.com/Beep6581/RawTherapee

`DateTimeOriginal` not found in Leica DNG

opened 07:49AM - 28 Mar 19 UTC

closed 08:26AM - 29 Mar 19 UTC

Floessie

patch provided scope: metadata type: enhancement

Hi fellows, Over at PIXLS we have a [report](https://discuss.pixls.us/t/no-da…te-time-taken-shown-for-leica-m8-dng-files-in-file-browser/11905) about missing date information when decoding a Leica DNG. I compared the file in the Geeqie EXIF window to a working image and found out that the DNG's `DateTimeOriginal` (0x9003) resides in `Exif.Image` while the working one has it in `Exif.Photo` (whatever that means). I added an `exif->printAll()` [here](https://github.com/Beep6581/RawTherapee/blob/68ba87a71ff670b08e2db0d5b887517f41d3d9b7/rtengine/imagedata.cc#L263) et voilà: we only decode the `Exif.Photo` tags. Basically I see two options: 1. Fallback to `DateTimeDigitized`: ```patch diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc index 4dcfe80ff..6d924d9a4 100644 --- a/rtengine/imagedata.cc +++ b/rtengine/imagedata.cc @@ -260,7 +260,7 @@ FrameData::FrameData (rtexif::TagDirectory* frameRootDir_, rtexif::TagDirectory* iso_speed = tag->toDouble (); } - if ((tag = exif->getTag ("DateTimeOriginal"))) { + if ((tag = exif->getTag("DateTimeOriginal")) || (tag = exif->getTag("DateTimeDigitized"))) { if (sscanf ((const char*)tag->getValue(), "%d:%d:%d %d:%d:%d", &time.tm_year, &time.tm_mon, &time.tm_mday, &time.tm_hour, &time.tm_min, &time.tm_sec) == 6) { time.tm_year -= 1900; time.tm_mon -= 1; ``` 2. Search the tree recursively for `DateTimeOriginal`: ```patch diff --git a/rtengine/imagedata.cc b/rtengine/imagedata.cc index 4dcfe80ff..e2402a62d 100644 --- a/rtengine/imagedata.cc +++ b/rtengine/imagedata.cc @@ -260,7 +260,7 @@ FrameData::FrameData (rtexif::TagDirectory* frameRootDir_, rtexif::TagDirectory* iso_speed = tag->toDouble (); } - if ((tag = exif->getTag ("DateTimeOriginal"))) { + if ((tag = exif->findTag("DateTimeOriginal", true))) { if (sscanf ((const char*)tag->getValue(), "%d:%d:%d %d:%d:%d", &time.tm_year, &time.tm_mon, &time.tm_mday, &time.tm_hour, &time.tm_min, &time.tm_sec) == 6) { time.tm_year -= 1900; time.tm_mon -= 1; ``` Both changes fix the problem, so pick one of the them or come up with another. :wink: Best, Flössie

Best,
Flössie

mnsh · March 28, 2019, 1:57pm

Dear Flössie
Thank you for raising the issue. The M8 is quite an old camera now and I got mine in 2007. I remember reading in the brochure that Leica and Adobe collaborated on the DNG file. It was never a problem in LightRoom but I don’t want to get drawn into their subscriptions now I couldn’t follow the details on github but I think that date taken and date digitised are the same for practical purposes as the moment I press the shutter.
Best wishes, Matthew

floessie · March 28, 2019, 2:10pm

Hi Matthew,

Sure, but there’s no reason to concentrate only on the newest models. The files are there and you should be able to get decent results with RT from them. So we do our very best to draw you to FLOSS.

Yes, but I think @Morgan_Hardwood is right and we’ll stick with DateTimeOriginal. Anyway, your problem should be solved in 5.6.

Best,
Flössie

mnsh · April 22, 2019, 1:24pm

Dear Flössie
Many thanks I just had an Ubuntu update including RT which is now 5.6 and shows my DNG dates, thank you so much for listening and getting this fixed.
Matthew