Picked from here: http://discussion.forum.nokia.com/forum/showthread.php?p=670326&posted=1#post670326

1) My widget backgrounds are svg files which i load into a QImage upon startup of the program. When this is
subsequently rendered using a Painter in the paintEvent method of the widget, it shows that for at least one
particular svg, substantial degradation is visible.
The svg file can be found here: http://qtracker.googlecode.com/svn/trunk/images/satview.svg
In 4.5.2 for S60 it renders as: http://qtracker.googlecode.com/svn/trunk/screenshots/Scr000040.jpg
In 4.6.0 for S60 it renders as: http://qtracker.googlecode.com/svn/trunk/screenshots/Scr000042.jpg
On the same versions for OSX everything renders fine.

Might be related to http://bugreports.qt.nokia.com/browse/QTBUG-4908