In reply to comment #7:
"Anyone an idea how to change this behaviour? The out-of-the-box thumbnailing 
for odt-files with tracker is great. It's quite annoyingly though, e.g. when 
you have a non-solid-white background, then it's hard to see these thumbnails 
in nautilus."

See below. They simply take the thumbnail contained in the OpenDocument
file itself (inside the archive) without any editing, apart from
resizing it with ImageMagick's `convert` utility. Also I couldn't find
the right command-line arguments to properly fill the background color.
`-color white -opaque none` comes close, but has some odd effects (I
didn't look very long though).

See: http://imagemagick.org/Usage/formats/#png_www

In reply to comment #10:
"As far as I know, tracker doesn't make thumbnails for nautilus."

The manpage for tracker-thumbnailer says: "tracker-thumbnailer  takes
an  image  file  as input and produces a thumbnail which is compliant to
the freedesktop.org thumbnail specification."

And the source for tracker-thumbnailer has:

thumbnails_dir = g_build_filename (g_get_home_dir(), ".thumbnails",
NULL);

See http://svn.gnome.org/viewvc/tracker/trunk/src/tracker-thumbnailer/

And there's a thumbnailer for OpenDocument files, see:
http://svn.gnome.org/viewvc/tracker/trunk/thumbnailers/application/

Try:
$ tracker-thumbnailer "OpenDocument Text.odt" 
application/vnd.oasis.opendocument.text normal

Where "Opendocument Text.odt" is obviously an existing OpenDocument Text
document in the working directory.

-- 
Gutsy: OpenOffice thumbnails transparent
https://bugs.launchpad.net/bugs/135324
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