[Digikam-devel] [Bug 275122] New: Rotating a TIFF file wipes out its metadata

[Guillaume Paumier]

https://bugs.kde.org/show_bug.cgi?id=275122

           Summary: Rotating a TIFF file wipes out its metadata
           Product: digikam
           Version: 2.0.0
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: Metadata
        AssignedTo: digikam-devel at kde.org
        ReportedBy: guillom.pom at gmail.com


Created an attachment (id=60750)
 --> (http://bugs.kde.org/attachment.cgi?id=60750)
exiv2 -pa output for the test (rotated) file

Version:           2.0.0 (using KDE 4.6.2) 
OS:                Linux

Rotating a TIFF file with metadata in digikam wipes out most of its metadata.

The attachments text files show the output of "exiv2 -pa" on two identical
files, before ("reference") and after ("test") the rotation.

The reference and test files are also available:
http://dl.dropbox.com/u/17707983/rotate-reference.tif
http://dl.dropbox.com/u/17707983/rotate-test.tif

This issue is particularly problematic, because it causes data loss; relevant
metadata like speed, aperture, etc. of a photograph are lost forever.

(One could attempt to restore some of the metadata using the values saved in
the database, unfortunately metadata can't be written to TIFF files; see bug
271757)

Reproducible: Always

Steps to Reproduce:
* Open a TIFF file with metadata (e.g. the attached reference photograph)
* look at the metadata, e.g. using exiv2 -pa <filename.tif>
* rotate the picture in digikam
* look at the metadata again

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