Quote:
Originally Posted by PeterCay
There must be a way to show custom book covers as a lockscreen without a proper Amazon ASIN number.
As an example I have the mobi book of "The Swiss Family Robinson" by J.D. Wyss
mobi-asin:340ffd6b-ba15-4894-b570-a07b846f00f5
My kindle can show the custom Hungarian language cover of this book as lockscreen. It is definitely not sold by amazon, only in English language with a completely different cover.
Other books with the same mobi-asin format is not showing their covers as lockscreen (showing only in the library of course).
What I don't understand is, how to read these mobi-asin codes, and therefore, how to set a proper one or a proper fake one for them.
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If your Kindle is showing a cover for a book Amazon does not sell, then forget everything I've written. As I said, this info is from when I was messing with covers years ago, before I started using Send to Kindle, and it may not be accurate now. Also, I was doing this to get covers in cover view and have no idea if the new screensaver feature works the same way.
But to provide more info on how it worked in the past:
If an azw3 has a proper ASIN, Kindle thinks it comes from Amazon and will download the cover from Amazon's server (you need to be connected to WiFi, obviously). Once downloaded, you can disconnect from WiFi if you want.
For a proper ASIN, the ebook needs to have 3 tags properly configured: EXTH 113, EXTH 504, EXTH 501. This is hidden file format metadata, which is not the same as the book metadata.
If you input the ASIN in the opf, Calibre's Quality Check plugin, will take the ASIN found in the opf and fix the EXTH tags. Sigil's KindleGen plugin will do the same if you check "Add fake ASIN".
Take all this with a grain of salt as my memory on all this may be faulty.