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Old 09-03-2017, 06:54 PM   #2
jhowell
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Posts: 7,101
Karma: 92190113
Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Since you already plan to modify the BooksByMail extension on your Kindle, another possible approach would be to do the cover extraction there and leave calibre unchanged. You could borrow Python code from Extract Cover Thumbs to accomplish this.
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