Quote:
Originally Posted by Katsunami
... The only reason I can think of why they do it like that is because it could be impossible for the Kindle to extract the cover. For example, all of my covers are 1024x768 pixels, where possible ... If the AZW/dual-mobi format is compressed, like EPUB, the Kindle would need to uncompress it, copy the cover out of it, remove the decompressed book, and then shrink the cover. For large books, that may take quite some effort, not to mention time.
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Every EPUB reader I know extracts covers from the ebook and shrinks it to create thumbnails for cover view. All my Sonys do this, iOS epub reader apps (Marvin, Bluefire Reader, Stanza) do this.
Only Amazon relies on an external server to download cover thumbnails. Why? I can't imagine it's because they can't figure out how to extract the cover from the ebook and shrink it the way epub readers do. I was actually shocked and befuddled when I got my first Kindle and discovered this was the Amazon way.
Quote:
Originally Posted by magarto
... If the ASIN is incorrect (because I have too many books without ISBN) I use the python script.
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Btw, ASIN and ISBN aren't the same. ASIN is Amazon's internal identifier, ISBN is a standardized identifier used by all booksellers, publishers, libraries, etc.
In any case, if you have a lot of books, looking up the ASIN for each and every one would be a major pain in the you-know-what, and while the Calibre metadata download option can help automate the process, I find it doesn't always work.
Glad you found a method that works for you!