[Scribus] .pdf export image resolution problem

[Philipp Klaus Krause]

When web is selected as target color the choice of image resolution is
restricted to resolutions not higher than 300dpi, when printer is
selected it seems less restricted.
But when web is selected when opening the esport dialog the resolution
is restricted to 300dpi even after changing the color to printer.
The workaround is to select printer, export a .pdf, then open the export
dialog again and select the desired resolution, then export the .pdf.

I use scribus 1.3.3.6 from Debian.

Philipp