[Mdemaillard]

Thanks Sabardeyn, i also already looked at that.
It is even possible to further filter ebooks having a calibre-generated cover using the "Quality-Check" Addon -> Check Structure -> Check calibre SVG Cover
(and do a lot of other things to the covers)

But unfortunately this all works on the correctly identified "cover part" of the ebook.
Thanks anyway for the suggestion, i'll take any further idea gladly.


theducks : this looks promising, i'll check it right away
hum, didn't find what i'm looking for after exploring in details "check-quality". It does have an awful lot of nice features thought, so i learned stuff and will be using it better.