Bug 262125

Summary: DNG Conversion can't be inverted. Embedded file is corrupted.
Product: [Applications] digikam Reporter: peter.gustafson
Component: Plugin-Bqm-DngConverterAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: caulier.gilles, tschenser
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In: 1.8.0
Sentry Crash Report:

Description peter.gustafson 2011-01-04 22:44:34 UTC 
Version:           1.7.0 (using KDE 4.5.4) 
OS:                Linux

There is no apparent digikam based method to extract the embedded raw file.  

Attempted extraction with Adobe's dng converter tool fails with message "No
embedded originals were extracted".  


Reproducible: Always

Steps to Reproduce:
All my cr2 files.  Convert to dng, embed, attempt to extract.  
Reproduced by rpgmaster94 on users mailing list with arw files.
Comment 1 Jens Mueller 2011-01-06 22:50:30 UTC 
I looked through the code and found that kipi dngconverter implemented a different compression scheme than that described in adobe documentation. Nevertheless there is also a bug in this implementation, so are all embeded originals are lost. Meanwhile I have a test implemetation based on zlib working with the adobe compression scheme. There is also Qts smarter qCompress, but this gets a different result at the moment.
Comment 2 Jens Mueller 2011-01-07 19:21:56 UTC 
SVN commit 1212625 by jmueller:

implement adobe compression scheme. Please test carefully before removing originals. I will try to build a simple commandline extractor too.

BUGS: 262125

 M  +58 -24    dngwriter.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1212625
Comment 3 Jens Mueller 2011-01-09 15:17:25 UTC 
SVN commit 1213193 by jmueller:

add first version of simple dng tool, able to extract embedded original raws

CCBUGS: 262125

 M  +1 -0      CMakeLists.txt  
 A             dnginfo (directory)  
 A             dnginfo/CMakeLists.txt  
 A             dnginfo/dnginfo.cpp   [License: GPL (v2+)]


WebSVN link: http://websvn.kde.org/?view=rev&revision=1213193