documentation - where are the thumbnails?

[Elle Stone]

Hi, All,

I've been going through the digikam documentation - the online html (which seems to match the downloadable pdf - yes? are they in sync?). The documentation says

"digiKam follows the freedesktop.org standards for thumbnail folders (http://docs.kde.org/development/en/extragear-graphics/digikam/using-firstrun.html)".

The link to freedesktop.org doesn't actually lead to information about where the thumbnails are stored. I'm guessing "/home/username/.thumbnails" is the actual "standard" (freedesktop denies setting standards) thumbnail location. But I think really digikam now stores thumbnails in its database?

"digiKam use a new database to cache thumbnails instead ~./thumbnails. File format used to store image is PGF (http://www.libpgf.org). PGF is a wavelets based image compression format and give space optimizations (http://www.digikam.org/drupal/node/477)".

Or does "thumbnails-digikam.db" only store references to the thumbnails, which are actually stored somewhere else?

[Gilles Caulier-4]

2011/1/5 Elle Stone <[hidden email]>

Hi, All,

I've been going through the digikam documentation - the online html (which
seems to match the downloadable pdf - yes? are they in sync?). The
documentation says

"digiKam follows the freedesktop.org standards for thumbnail folders
(http://docs.kde.org/development/en/extragear-graphics/digikam/using-firstrun.html)".

This is not true from digiKam 1.x. The reason is optimize space used on disk. PNG compress is not the best.

As you said below, PGF format is used instead and all data are stored in a sqlite database file. The compression ratio can be between 2 to 5. For 100 items, the gain is not to huge, but imagine for 100.000 items. It's not negligible.

Using this way, we can also ref all items hosted on a removable media.

Gilles Caulier
 

The link to freedesktop.org doesn't actually lead to information about where
the thumbnails are stored. I'm guessing "/home/username/.thumbnails" is the
actual "standard" (freedesktop denies setting standards) thumbnail location.
But I think really digikam now stores thumbnails in its database?

"digiKam use a new database to cache thumbnails instead ~./thumbnails. File
format used to store image is PGF (http://www.libpgf.org). PGF is a wavelets
based image compression format and give space optimizations
(http://www.digikam.org/drupal/node/477)".

Or does "thumbnails-digikam.db" only store references to the thumbnails,
which are actually stored somewhere else?
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[Elle Stone]

Giles, thank you for clarifying this for me.
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