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This is something that should be fixed in your source. In over 10 years I've never had to have Calibre change images, or had an an image issue with Amazon, Apple, Barnes&Noble, Kobo, Google Playbooks, Smashwords etc.
Note that MS Word tools are only affecting appearance for paper/PDF. Fix images outside Word or LO Writer. (Any decent editing program, but not any MS product or tool).
2664 x 2991 is a crazy size for an ebook.
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