Thread: Troubleshooting Image Formats ? ? ?
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Old 06-15-2016, 04:22 PM   #2
eschwartz
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Join Date: Nov 2012
Location: The Beaten Path, USA, Roundworld, This Side of Infinity
Device: Kindle Touch fw5.3.7 (Wifi only)
Depends whether the exth 501 metadata field (cdetype) is set to PDOC or EBOK.
  • PDOC: the Kindle will extract the cover from the ebook file.
  • EBOK: the Kindle will try to download the cover from Amazon's servers, based on the ASIN.

The simplest solution:
If you send the books with calibre, calibre will sideload the thumbnail image into [userstore]/system/thumbnails/ to ensure that you get a cover image in Cover View.
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