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Old 05-05-2019, 05:02 PM   #3
ilovejedd
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Posts: 5,110
Karma: 19597086
Join Date: Jan 2009
Location: in the middle of nowhere
Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9
  • Do book formats matter (eg. mobi / azw3 / kfx) ?

    USB sideloading using Calibre send to device should upload the covers separately (to a hidden <drive>:\system\thumbnails folder) so format shouldn't have been an issue. It's only when using email to Kindle or copying via file manager/system when formats matter. Iirc, the Kindle will only read embedded covers from MOBI old [PDOC]. Caveat, you lose a lot of advanced features (e.g. boldness, custom fonts, etc). Might work for MOBI both, too, but it's been a while since I last tested that so I've forgotten what the results were.

  • Do book ids matter (eg. must I set/unset isbn / mobi-asin) ?

    Same as above. Shouldn't matter when using Calibre send to device.

  • Do book cover sizes matter (eg. Is there a maximum resolution) ?

    If there is, I haven't managed to hit it yet. I think all my book covers are at or below 1200*1600, though.

  • Under what circumstances can/does the Kindle download it's own covers from Amazon ?

    Iirc, it worked for AZW3 with matching/correct Amazon ASIN. Never tried MOBI or KFX.

  • Must I embed the cover image somehow (eg. I've read about epub to epub conversions) ?

    As mentioned, reading from embedded covers only works for MOBI old [PDOC] (maybe MOBI both, too).
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