It is a known issue with the Postscript file format (and the PDF-1.0 format). The format doesn't permit the same level of support for transparency as SVG does (particularly noticeable for gradient transparency).
This is an issue we've _long_ dealt with in Inkscape. Emulations and workarounds have been proposed and may become available eventually (such as when the new cairo-pdf extension is finished, probably for the 0.46 release later in 2007). However, the correct solution is to implement PDF-1.5 export capability in Inkscape, which does have adequate transparency support. Anyway, here are some of the upstream bugs relating to this: http://sourceforge.net/tracker/index.php?func=detail&aid=1255734&group_id=93438&atid=604309 http://sourceforge.net/tracker/index.php?func=detail&aid=1179448&group_id=93438&atid=604309 http://sourceforge.net/tracker/index.php?func=detail&aid=1492661&group_id=93438&atid=604309 -- Saving as PDF and PostScript doesn't keep translucency. https://launchpad.net/bugs/54097 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
