[Digikam-users] Update embedded JPEG of RAW Files

GDoirat - GMail gaylord.doirat at gmail.com
Mon Nov 3 22:45:08 GMT 2014

Hi Elle,

Thanks a lot for your answer.
Sounds great. I will try this. As I have DNG raw file, i have to change to
-ext DNG . Hopefully exiftool can read/write DNG !! [?]
If this is working this will solve my problem.
My workflow to process my rawfile would be then :

   - Import raw files in darktable
   - Rate (star) rawfiles in darktable
   - Developpe rated rawfiles (files not rated aren't good, so i don't
   loose time to developpe them)
   - Export Jpeg
   - Use ExifTool to update embedded JPEG of rawfiles
   - Erase Exported JPEG
   - Open Digikam : he will scan new files and import xmp info (number of
   star) and show me embedded JPEG updated
   - Finish to complete pictures informations in DK (localization, face
   recognition, tags, comments...)

This will avoid me to have duplicated files (RAW + JPEG) which was really a
pity for me.

I will confirm if this okay in a futur mail, once I could try this more

See you


2014-11-03 11:54 GMT+01:00 Elle Stone <ellestone at ninedegreesbelow.com>:

> On 11/02/2014 06:04 PM, GDoirat - GMail wrote:
>>> Hello Everybody
>>> I use Digikam to manage my photo database for many years.
>>> With my first camera, i took my pictures in JPEG... Digikam was really
>>> great.
>>> I bought a SLR camera and started to took pictures in RAW.
>>> I prefer to developpe my raw files in another software than digikam;
>>> but i still really like photo database managment of DK. But preview of
>>> raws are not updated when i do changes in the raw file (i'm using
>>> darktable).
>>> Is there a way (a software included or not in digikam) to update
>>> embedded raws with exported jpeg from darktable in order that digikam
>>> display a raw preview which includes changes done in darktable?
>>> My search on web make me realised that Lightroom seems to be abble to
>>> do that but i didn't succeed in finding a way to to that on linux.
> Hmm, I have also wished that I could overwrite the embedded preview jpeg,
> and also always just assumed that you can't change the embedded preview
> jpeg.
> But actually it turns out that you *can* overwrite the embedded preview
> using exiftool. It's a bit round about:
> First develop the raw file.
> Then save a copy of the developed raw file as a jpeg.
> Then use exiftool to embed the "new preview" jpeg into the raw file,
> writing right over the top of the orginal embedded jpeg.
> See this page:
> http://u88.n24.queensu.ca/exiftool/forum/index.php/
> topic,2245.0.html?PHPSESSID=njo90ntbht6qapg9on7i9q4l81
> /////// Quoting Phil (exiftool author) from the above link:
> If I understand you correctly, you want to write same-named
> JPEG images as the PreviewImage for a set of CR2 files.
> exiftool "-previewImage<=JPGDIR/%f.jpg" -ext cr2 CR2DIR
> /////// end quote
> I tested the command and it does work. "JPGDIR" and "CR2DIR" need to be
> replaced with whatever directories the files are in (can be the same
> directory).
> It probably wouldn't be too difficult to write a script to automate the
> process. Just make sure you test thoroughly on some throwaway images. I
> managed to mess up a raw file by running the command with the wrong syntax.
> I believe your new preview image must have the same size (and possibly the
> same orientation) as the original preview, but I haven't confirmed.
> I don't know which embedded file digiKam shows (there are several to
> choose from), but I will guess it's the previewImage.
> Also see reading and writing examples from http://www.sno.phy.queensu.ca/
> ~phil/exiftool/exiftool_pod.html
> Not every camera raw file has exactly the same set of embedded images. For
> example, my canon raw files don't seem to have the "JpgFromRaw" that is
> referenced in the exiftool reading and writing examples.
> Elle
> _______________________________________________
> Digikam-users mailing list
> Digikam-users at kde.org
> https://mail.kde.org/mailman/listinfo/digikam-users

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