@Clifford For the book cover, I'm using Krita mainly to get artwork+main titles as a big picture. My printer uses the PDF/X-1a standard (welcome to 2000) and that format doesn't support image transparency so I can't use Scribus to paste all elements togethers (eg. like having the font art I did as a PNG).
I'll use Scribus in a final pass to import the picture and add a bit more text on the back (vector/postscript datas are ok) and export with the correct compliance for PDF/X-1a.
Mostly an instance for friends and family. Nothing special.