converting ppt to pdf

[Tapas Mishra]

Hi,
I am trying convert  a bunch of presentations which are in 2003 office
format extension .ppt.
Using  OpenOffice.presentation to pdf.

1) I tried exporting in OpenOffice these presentations as pdf the quality of
text or image gets distorted.(I did checked the option to preserve quality)

another method I tried was
2) to export this ppt to gif on a Windows machine (using PowerPoint) and
then using imagemagick and pdftk tried to convert them all the gifs that I
got on a windows machine  to pdf.I got some success in it but the quality of
text was quite distorted.
What more can I do so that the image which is in ppt looks same in pdf also.
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