I don't know if this applies or not to the above cover situation but I have something to add. If I edit the cover of a FFF book thru any of several methods (custom image, larger higher quality image or generated cover) it will default back to the original UNLESS I manually edit the book (using the Calibre edit functions built in Sigil-like editor) and then change something before saving it. Then the cover will remain as I manually set it on FFF updates.
Edit: Feels like it basically does the same as injection/polish methods described
|