Quote:
Originally Posted by olbeggaols
The first thing I note is that the converted file is placed in a directory with an image (the cover image) and with an .opf file. The question is what do I store on the website? The directory, or just the .mobi file.
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Just the MOBI file. The cover and opf files are for calibre's use and are not needed for Kindle readers.
Quote:
Originally Posted by olbeggaols
Is there any way that one file will serve?
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In my opinion the most versatile Kindle format is a Master MOBI created using Amazon's Kindle Previewer. That is a single file containing the older MOBI7 format and the newer KF8 (azw3) format, allowing pretty good rendering on all Kindle apps and devices. One advantage is that the user doesn't need to know which format to pick for their particular Kindle app/device.
Calibre can produce a similar MOBI-both format which is smaller in size, but I better trust the conversion by Amazon's tool to produce a file without any compatibility problems.
Quote:
Originally Posted by olbeggaols
The second question is that I seem to be getting two covers.
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By default calibre replaces the cover image in the book with the cover set in the calibre library. Sometimes this does not work properly and can produce a double cover. That conversion option can be disabled ("Use cover from source file" option). Again, I recommend using Amazon's converter instead.