[Scribus] PDF export turns pictures pale

[Eilert]

The other day I exported some pages to PDF. There were 3 photos on the 
pages, and as I wanted them to come out as good as possible, I turned 
the choice to "maximum" quality.

Much to my surprise, the photos became rather pale then, i. e. contrast 
was week, no dark colours (gamma setting?). Choosing a poorer quality 
let the pictures appear right again.

Did I detect a bug, or is it a feature?

Rolf