With firmware 2.10.0 there is an extra cover image generated: there are now four images for each book, instead of the three previously.
The new image ends in " - AndroidBookLoadTablet_Aspect.parsed" and is generated for epubs from the first page of the book when the book's details page is viewed. (For Kobo-bought kepubs this image seems to be dowloaded from the server, as it doesn't appear unless wifi is enabled)
The new image suffers from the usual problems associated with generating cover images from the first page, so it would be good if a future Calibre version could send this image along with the other cover images, to avoid having the device generate it.
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