I tried your image on calibre 5.27 on OSX Big Sur 11.6 and was able to browse to it and add it as a cover image with no issues. On the other hand, what type of display are you running that needs an 4967x7021 image for a book cover?
Also tested on Windows 10 x64 with calibre 5.27 x64 and on OpenSuse Tumbleweed. No errors were seen.
|