does the pdf look good?
That actually depends on the pdf viewer. In Okular it displays just like in Scribus and looks fine but when I open it in acrobat (which the printer is probably using) it looks not so good.
are the colors in the pdf rgb or pdf?
All the images are in CMYK and the pdf is exported for print so it should all be CMYK
are the colors in the .sla file rgb or pdf?
All colors are CMYK
have you enabled the color mananagement?
I tried enabling something there but didn't really understand it so I'm not so sure.
to which pdf version are you exporting your project?
I tried exporting in all version Scribus allows and the text was either completely black and ignoring the blend modes or it was exporting it weirdly
which pdf version is the print shop expecting?
They didn't specify anything but as I tried all versions Scribus allows it doesn't seem to matter at this point.
do they correctly support transparencies? (normally, i don't think that the transparencies are involved in the blending modes... but i'm not 100% sure of it...)
I noticed pdf 1.3 and some of the pdf x versions didn't support the blend modes/transparancies.
I got my brother to recreate this in InDesign to see if it was something with how blend modes behave and when he put a black text on top of the image and applied overlay blend mode the text turned white instead of dark blue like in Scribus so it might be that the blend mode in Scribus is working on some different math or something.
InDesign reference
