I am running Koreader under android and set up .jpg image (book10.jpg) as the background which is displayed for all my books.
This was done by adding the following line into the
settings.reader.lua
Code:
["cre_background_image"] = "/storage/emulated/0/koreader/styletweaks/Book10.jpg"
I wonder if there is a way to make book specific backgrounds if I want a different .jpg for a specifi book?