Those books were copied from a Kindle PW4 in KFX format. One sample cover was relatively low resolution at 837x1256px and in 16 glorious shades of grey. The same book downloaded via K4PC also in KFX format shows a 2401x3639px image in 24 bit colour. I do have calibre's maximum_cover_size tweak set to:
Quote:
# The maximum width and height for covers saved in the calibre library
maximum_cover_size = [2600, 3900]
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These books were not converted by calibre, this is the imported and non-metadata edited flavour. I am wondering how you are seeing a colour cover image since other than the Colorsoft, Amazon's Kindle e-Ink readers don't do colour.