Bug 204138

Summary: Possibility to extract JPEG previews from RAW files during camera import
Product: [Applications] digikam Reporter: Milan Knížek <knizek>
Component: Import-PostProcessingAssignee: Digikam Developers <digikam-bugs-null>
Severity: wishlist CC: caulier.gilles, j.keil, laurent.espitallier, rprots
Priority: NOR    
Version: 1.0.0   
Target Milestone: ---   
Platform: Compiled Sources   
OS: Linux   
Latest Commit: Version Fixed In: 3.3.0

Description Milan Knížek 2009-08-17 09:29:50 UTC
Version:           1.0.0_beta4svn (using KDE 4.2.4)
OS:                Linux
Installed from:    Compiled From Sources

It would be nice if digiKam can extract the ebmedded JPEG previews from RAW files during import from the camera/card reader. Some RAW files can have more embedded images, the import plugin should allow the user to select which one to extract.

Reasoning: Some cameras (Canon EOS 300D, 5D Mark II, ...) store a full resolution JPEG image in the CR2 RAW file. Instead of "developing" from RAW file again, it is often sufficient to use this JPEG preview as a final image.

FYI, exiv2 command line to extract the second embedded JPEG would be:

$ exiv2 extract -ep2 image.cr2

I can provide CR2 files for testing.
Comment 1 caulier.gilles 2009-08-17 09:45:01 UTC
We already use these embedded JPEG images to render RAW preview and thumbs... It's done internally in digiKam using Libraw.

Gilles Caulier
Comment 2 Roman Prots' 2010-01-14 13:42:59 UTC
We may want to add functionality that will allow to extract previews from set of RAWs instead of converting RAWs. Usually they are enough for previews / sharing and extracting process is much more faster.
Comment 3 Laurent Espitallier 2012-11-17 16:46:30 UTC
*** Bug 303560 has been marked as a duplicate of this bug. ***
Comment 4 caulier.gilles 2013-06-25 10:22:03 UTC
Since 3.1.0 release, Batch Queue Manager is able to extract Raw preview in a processed queue. You can batch save it in your preferred format. It's not enough ?

Gilles Caulier
Comment 5 Jochen Keil 2013-06-26 09:15:33 UTC
I tried the raw extraction feature in 3.1.0 out today and it does exactly what I want.
That's really awesome, thank you very much!