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Yup, something nasty happened during conversion. The images in the MOBI that acquire the magenta background probably have some attribute (e.g. extra alpha channel layer, ...) that calibre's image.lib fails to recognize and properly handle. Massaging these in PS can yield decent images (see attached before & after example), at least no worse than the exported images, but there are so many JPEG compression artifacts that they still aren't very good.
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