https://bugs.documentfoundation.org/show_bug.cgi?id=76680

--- Comment #7 from Tomaz Vajngerl <[email protected]> ---
OpenOffice generates more low quality thumbnails. In LibreOffice we changed
that at one point to a higher quality but unfortunately the file size of the
thumbnail has considerably increased. In LO 4.4 I have made some optimizations
(used PNG8, lower quality image scaler) and the thumbnail file size is now much
smaller - about the same as in OpenOffice (sometimes less, sometimes more). but
still the same dimensions and quality.

I tried some tests today on one document:
LO 4.3    - 36,9 kB (thumbnail 25,4 kB)
AOO 4.1.1 - 16,5 kB (thumbnail 5,1 kB)
LO 4.4    - 17,2 kB (thumbnail 5,7 kB)

You can also disable thumbnail creation. This is described in [1].

[1]:
http://ask.libreoffice.org/en/question/36746/is-there-any-way-to-disable-saving-thumbnails-in-odtods/

So the solution for you is to either disable the thumbnails or move to LO 4.4.

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