Thread: ebook cover lockscreen doesn't work for sideloaded books
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Old 05-11-2021, 02:49 PM   #21
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
I plan to research what characteristics a book needs for the cover to show once I have this feature on my Oasis. For now I just took a quick look at some of the Kindle software related to the cover view.

It appears that it can be blocked by various criteria. It looks like it won't work for Audible books, dictionaries, or newspapers. Books in PDF or Topaz format also will not work. The book needs to have both CDEContentType (EXTH 501) and CDEContentKey (EXTH 504) metadata set. It looks like the cover dimensions may need to fall within a certain range, but I don't know exactly what.

Books produced using Amazon's kindlegen or Kindle Previewer will lack the metadata needed for cover display if sideloaded via USB. Calibre will also omit this metadata if the "Enable sharing of book content" conversion option is selected.
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