[Bug 165229] New: thumbnail complete update does not work reliably, even for jpgs

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http://bugs.kde.org/show_bug.cgi?id=165229         
           Summary: thumbnail complete update does not work reliably, even
                    for jpgs
           Product: digikam
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Thumbnails
        AssignedTo: digikam-devel kde org
        ReportedBy: f14fjne02 sneakemail com


Version:            (using KDE 3.5.9)
Installed from:    Compiled From Sources

Today I decided to create all thumbs from scratch
I erased my .thumbnail folder (linux), just to be sure
I created all the thumbnails - it was way too fast
I checked and found for most of the folders that when selecting them lots of thumbs were added in .thumbnails

I set up a new digikam filestructure with 5 jpgs
I deleted my .thumbnail folder again
I created the thumbs again - only 2 ot of 5 were updated! All files from the same camera.
Mmmmh
not good

I tried a workaround by updating the thumbs using KPhotoAlbum, it did the job, even for raw files.
But: Digikam does not accept these thumbs, although the filenames are correct.
Explanation: Digikam does not accept thumbs with the tag "Software" set other than "Digikam Thumbnail Generator"
Workaround: Set the tag manually:
cd ~/.thumbnails
exiftool -v0 "-Software=Digikam Thumbnail Generator" -r . -ext png -overwrite_original
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[Gilles Caulier-4]

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------- Additional Comments From caulier.gilles gmail com  2008-06-28 21:37 -------
No, no , and no...

digiKam shared thumbs generated by KIOslave (the digiKam one), but do not use thumbs generated by another application. Why ? because thumbs generator from digiKam is better.

Try to generate thumbs from konqueror, which use a code from KDELibs : all raw file are not supported, only few JPEG are done (with a special compresion ratio), PNG and tiff sometimes do not work, IPTC.preview tag is not supported...

Well, for me, digiKam thumb generator is better. that all... This have been done as well to solve a lots of old bugs reports set in bugzilla.

For your problem, i recommend to check your installation. digiKam KIO-slave work perfectly. I suspect a depency broken (check libkexiv2 and libkdcraw). Look in your ~/.xsession-errors

Note : in KDE4, thumbs kioslave have been removed. we use now multithreading. It's more easy to debugs and can be adjusted fine (priority, fork to cpu, etc.)

Gilles Caulier
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