Dia graphics fuzzy when embedded and converted to pdf

[Daryl Manning <daryl wakatara com>]

This is a strange one...

When I use dia exported png or jpg diagrams and embed them in either
OpenOffice or KWord and then save them out to a ps or pdf the diagrams
appear quite "fuzzy" and there is a reddish haze around black lettering
on the white backgrounds.

It only happens with dia (for instance, other embedded pngs and jpgs
seem ok). I was wondering if it was one of the settings that I have or
something else I haven't thought of.

Anyone got any ideas what this might be?

thanks!
Daryl.