[Digikam-devel] Thumbnails

[Gilles Caulier]

2009/5/23 Andi Clemens <andi.clemens at gmx.net>:
> Hi,
>
> is it possible that our thumbnails are somehow not compatible with dolphin or
> gwenview?

When i have written thumbnail extraction code into KDE3 branch, few
year ago, i have take a care to be compatible with other KDE
application as konqueror.

To be clear, digiKam record a text fingerprint in PNG metadata to
identify thumbs generated by digiKam. Why ? because konqueror (and now
dolphin) use KDE thumbs creator which is dumy : wrong support of PNG,
wrong support of different JPEG compression level, no RAW support etc.

http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#67

So digiKam share thumbs with other KDE application but never use
thumbs generated by others ! In the past a file in B.K.O have been
open about this subject.

Other, point is the size of thumbs : OpenDesktop spec said that normal
and large thumbs must be generated (128x128, 256x256). If i'm not too
wrong digiKam only generate 256x256. This can be the issue of your
problem.

Gilles

> When I watch an album and generate all thumbnails, digiKam will display them
> fast on the next opening of this album.
> But when I open this album with dolphin or gwenview, the thumbnails are
> regenerated. You can recognize this by the slow displaying of the rthumbs and
> also the size increment of the .thumbnails folder.
>
> I even guess that dolphin and gwenview are not compatible, too.
> What is this? I always asked myself why the .thumbnails folder is over 1.2GB
> big, but now it seems to be clear: There seems to be triple data in this
> folder.
>
> Can anyone else confirm this?
>
> Andi
>
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