[Digikam-devel] [digikam] [Bug 337422] New: Embedded Thumbnail EXIF data not updated when writing metadata to image

[Michele]

https://bugs.kde.org/show_bug.cgi?id=337422

            Bug ID: 337422
           Summary: Embedded Thumbnail EXIF data not updated when writing
                    metadata to image
           Product: digikam
           Version: 4.1.0
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Metadata
          Assignee: digikam-devel at kde.org
          Reporter: michele at soccio.it

After adjusting the date of some photos to subtract 6 hours, the EXIF data of
the image and of the embedded thumbnail (directly embedded by the camera) are
not the same.
The image EXIF data are fine and reflect the update I have done, whilst the
thumbnail data are untouched and are still aligned to the original time.
Please refer to the attached URL for the example.

Reproducible: Always

Steps to Reproduce:
1. Select an image with an embedded thumbnail
2. Image -> Adjust Time and Date...
3. Subtract 6 hours (for example), then press apply
4. Image -> Write metadata to image (first make sure the option to write the
metadata timestamp to the image is ticked)

Actual Results:  
The image and the Embedded Thumbnail have different timestamp

Expected Results:  
Embedded Thumbnail has same timestamp as the image

Screenshot with the problem in Digikam:
https://dl.dropboxusercontent.com/u/151071/Embedded_Exif_Digikam.png

Sample image:
https://dl.dropboxusercontent.com/u/151071/DSC00193.JPG

I am flagging the severity as "Normal" as there is no easy workaround: Shotwell
is using the thumbnail data for some (strange) reason, and although you could
remove the thumbnail or update it using 'exiftool', this is something that only
a power user could be able to achieve.

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