[Digikam-devel] [Bug 288513] New: Metadata from old Canon RAW files (.crw+.thm) is not read (and written) correctly.

[Thorsten]

https://bugs.kde.org/show_bug.cgi?id=288513

           Summary: Metadata from old Canon RAW files (.crw+.thm) is not
                    read (and written) correctly.
           Product: digikam
           Version: 2.3.0
          Platform: MS Windows
        OS/Version: MS Windows
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: Metadata
        AssignedTo: digikam-devel at kde.org
        ReportedBy: M8R-gkdi201 at zippymail.info


Version:           2.3.0
OS:                MS Windows

Running digiKam 2.3.0 (from SourceForge installer) under Win7 64bit in WinXP
SP3 compatibility mode.

Older Canon Cameras add the Metadata of their RAW files (.crw) into sidecar
files (.thm), which are basically .jpg files. (I believe that the .crw files
contain some Metadata too.) It seems like digiKam doesn't recognize or handle
them correctly. Metadata like focal length is read incorrectly, GPS Metadata is
not recognized at all. When such RAW files are geotagged with digiKam, digiKam
seems to remember their position somehow, although Picasa, GeoSetter and
EXIFtool are unable to detect any GPS Metadata. When .thm files are copied into
a different directory and renamed as .jpg, digiKam reads and handles their
metadata correctly.

Reproducible: Always

Steps to Reproduce:
1. Geotag Canon RAW Files (.crw + .thm) from Powershot S30 or G3 with GeoSetter
or Picasa.
2. Show on Map
3. Menu - Image - Metadata - Edit All Metadata - Edit Exif - Lens
4. Use Geotagging Plugin to assign a position (different from position assigned
in 1,)


Actual Results:  
After 2: Photos don't show up on Map
After 3: Wrong focal length is displayed (50mm)
After 4: DigiKam shows the photo now the newly assigned position, GeoSetter and
Picasa still use the old position from Step 1.

Expected Results:  
After 2: Photos should show up (as do .jpg files or ,cr2 RAW-files of newer
cameras. You can verify this by renaming the .thm file to .jpg)
After 3: Correct focal length is 21.3mm
After 4: Metadata should be consistent and be recognized by other Programs like
Picasa and GeoSetter (which is based on EXIFtool)

Ignoring the presence of Metadata or interpreting it wrongly is likely to lead
overwriting correct Metadata or creating to conflicts between different sets of
 Metadata for the same picture.

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