I'm working with Scribus 1.4.1.
My document has a PNG image that has an opaque object surrounded by transparency. The object has smooth edges - they transition from fully opaque to fully transparent happens over a distance of a few pixels.
When I import this PNG into Scribus it looks great - nice smooth edges.
When I export from Scribus to PDF the smooth edges become jagged - the middle of the object is still opaque and the boundary is still transparent, but the transition is abrupt.
It looks as if the full 8 bit alpha channel of the PNG image has been truncated down to just one transparency bit - 100% transparent / 100% opaque.
I've tried three different PDF viewers, including Acrobat viewer 9, and the problem shows up in all of them.
I've tried modifying various Scribus export settings, but haven't found one that solves the problem.
How can I solve this problem ?