You could try using "losslessly compress jpegs" or whatever it is in the Calibre editor.
And if you're brave, you can lossily compress them while you're there
(And I've seen some insanely bloated books on the kindle store)
EDIT: It's "Compress images losslessly'
Last edited by binaryhermit; 12-24-2019 at 11:54 PM.
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