Hello,
to make shure what was discussed recently on irc, I wrote a small overview 
of Scribus' colour policies on ColourWiki:
<http://www.oyranos.org/wiki/index.php?title=Scribus>
If you have time please correct or equally point me to a Scribus own 
document. On the ColourWiki entry especially PDF/X3 is uncertain to me.
To compare what configuration options will be available in Oyranos see
<http://www.oyranos.org/images/oyranos-config-flu-0.1.4_051127.png> a 
screenshot.
kind regards
Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: ku.b at gmx.de
                                + http://www.behrmann.name