Here's a version of the tracker thumbnailer written in Python which uses
the Python Imaging Library (PIL) to modify the background color to white
(works for all ODF types). It's quite similar to the one presented in
the Ubuntu Forums earlier
(http://ubuntuforums.org/showthread.php?t=76566), but that one didn't
change the background color so had the same transparency issue.

This could replace the Tracker version but would (I assume) bring in
some unwanted dependencies (Python, PIL etc.). Is there a separate
thumbnailer package  such as thunar-thumbnailers?

Also the shadow effect on PDF thumbnails seems to be generated by
evince-thumbnailer (evince-thumbnailer -s 128 test.pdf test.png). I
didn't replicate this.

** Attachment added: "OpenDocument thumbnailer"
   
http://launchpadlibrarian.net/17551089/vnd.oasis.opendocument.text_thumbnailer

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