[Digikam-devel] [Bug 139264] New: digikam sorts pictures with wrong exif tag

[Yuchen Wang]

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           Summary: digikam sorts pictures with wrong exif tag
           Product: digikam
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: cosmorning yahoo com


Version:           0.9.0, with kipi library version 0.1.4 (using KDE KDE 3.5.1)
Installed from:    SuSE RPMs
OS:                Linux

I started using digikam to manage my pictures recently. I am using version 0.9.0. However, I found when I switched to calendar view (Dates view), digikam sorts my pictures by an EXIF tag "DateTime", instead of tag "DateTimeOriginal". I have some pictures touched by Adoble Photoshop Album, which changed the tag "DateTime". See my attachment. The picture was taken on 12/21/2005, but processed from raw in 1/1/2006. However, it shows up in my calendar January 2006. I think it is better to sort pictures by tag "DateTimeOriginal" if it is available, since this field holds most trustable information for the picture. Following is the print out of the exiv2 from command line:

Exif.Image.DateTime                          Ascii      20  2006:01:01 22:36:19
Exif.Image.YCbCrPositioning                  Short       1  Centered
Exif.Image.ReferenceBlackWhite               Rational    6  0/1 255/1 0/1 255/1 0/1 255/1
Exif.Image.ExifTag                           Long        1  284
Exif.Photo.ExposureTime                      Rational    1  1/500 s
Exif.Photo.FNumber                           Rational    1  F11
Exif.Photo.ExposureProgram                   Short       1  Auto
Exif.Photo.ExifVersion                       Undefined   4  48 50 50 48
Exif.Photo.DateTimeOriginal                  Ascii      20  2005:12:21 08:35:23
Exif.Photo.DateTimeDigitized                 Ascii      20  2005:12:21 11:35:23

Please take a look. Thanks.
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[Yuchen Wang]

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------- Additional Comments From cosmorning yahoo com  2006-12-27 04:40 -------
Created an attachment (id=19043)
 --> (http://bugs.kde.org/attachment.cgi?id=19043&action=view)
screenshot for digikam 0.9.0

screenshot for digikam 0.9.0
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[Yuchen Wang]

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------- Additional Comments From cosmorning yahoo com  2006-12-30 09:36 -------
according to exif spec 2.2:

        DateTime
        The date and time of image creation. In this standard it is the
        date and time the file was changed.
       
        DateTimeOriginal
        The date and time when the original image data was generated.
        For a DSC the date and time the picture was taken are recorded.

Hence I believe when digikam should sort pictures by DateTimeOriginal, NOT DateTime.
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------- Additional Comments From mikmach wp pl  2006-12-30 20:10 -------
Agree with you. Looks like datetime used for Date view is taken from
database. Wrong data is taken when importing photo into albumdb.
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[Gilles Caulier-2]

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caulier.gilles kdemail net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Searches
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[Gilles Caulier-2]

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caulier.gilles kdemail net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Searches                    |Albums GUI
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------- Additional Comments From bluedrago web de  2007-01-24 22:24 -------
Ah... I can confirm it.
It's a duplicate of <i><a href="show_bug.cgi?id=135011" title="UNCONFIRMED - Sort images by EXIF date seems buggy for Nikon (or not just Nikon?)">bug 135011</a></i>
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lure kubuntu org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bluedrago web de



------- Additional Comments From lure kubuntu org  2007-01-24 22:44 -------
*** Bug 135011 has been marked as a duplicate of this bug. ***
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------- Additional Comments From lure kubuntu org  2007-01-24 23:49 -------
Created an attachment (id=19399)
 --> (http://bugs.kde.org/attachment.cgi?id=19399&action=view)
digikam-exif-date.patch

Proposed patch for DMetadata::getImageDateTime() method to prefer
DateTimeOriginal and DateTimeDigitized before DateTime (which is typically
changed by photo editing   software).

I think we should get this in 0.9.1 (together with improvements for Exif/ITPC
sync), but would like to get this reviewed by at least one of more experienced
Digikam developer before committing into SVN.
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lure kubuntu org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|digikam-devel kde org       |lure kubuntu org
             Status|UNCONFIRMED                 |ASSIGNED
          Component|Albums GUI                  |Metadata
      everconfirmed|0                           |1
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