Thread: MOBI support for reflowable files ending on June 28, 2021
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Old 02-12-2022, 11:56 AM   #70
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by stefano.sb View Post
Hi, it's true! I agree with you jhowell! Attached there is a zip file with the two MOBI versions of the same ebook. The one with the file name ending with "NO CALIBRE.mobi" is the version NOT converted with Calibre

What is the difference between the two versions that causes the thumbnail cover not to be displayed?
I took a look at the MOBI files. According to the metadata the non-calibre file was produced using Mobipocket Creator version 4.2 on 2010-03-05.

The reason that file does not work correctly is that the cover image it contains is only 150 x 236 pixels. This is too small for the Kindle to produce a proper thumbnail image of the cover. (I do not know the actual minimum cover size needed. I suspect it varies by Kindle model and firmware.)

The cover in the working MOBI file is 317 x 500 pixels which is large enough to work properly.
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