[Digikam-devel] [digikam] [Bug 338075] New: Tagging RAW images for Canon EOS-1Ds corrupts them

[kaptainkory at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=338075

            Bug ID: 338075
           Summary: Tagging RAW images for Canon EOS-1Ds corrupts them
           Product: digikam
           Version: 4.2.0
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: Tags
          Assignee: digikam-devel at kde.org
          Reporter: kaptainkory at gmail.com

I have digital RAW images taken with a Canon EOS-1Ds (mark 1, original). 
Tagging these images in digiKam corrupts them.

For some bizarre reason, Canon gave these raw images a .TIF extension which has
causes all kinds of issues along the way!  In digiKam, it appears that the
embedded thumbnails are rendered correctly (though small) in Thumbnails and
Preview Image views.  However, opening these files for editing only treats them
as true TIF files, opening only the embedded thumbnail.

After renaming with a .RAW extension (usually a fix for these things), digiKam
displays a thumbnail with strange colors in Thumbnails and Preview Image views,
but it does open correctly for editing.

I can live with the thumbnail quirks, but I can't live with completely
corrupted files just by tagged them!!!  Tagging images should be a very safe
thing to do, but right now someone is in danger of losing their entire library
of these files!!!  Thank goodness I had backups and caught what was happening.

When these files have a .TIF extension, tagging always corrupts them.  When
these files have a .RAW extension and "If possible write Metadata to RAW files
(experimental)" in the settings is unchecked, sidecar XMP files are created and
the originals spared.

When corruption occurs, what should be 9-11 MB files are resaved as 280ish KB
files (embedded thumbnail?).  No warnings or any other obvious signs hint that
this has occurred.

A sample raw image for testing can be downloaded:

https://drive.google.com/file/d/0ByXO8US0zFPicXFYVV9ISDY0Rlk/edit?usp=sharing

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