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[QUOTE=Malcolm JW;4114037]...and then upload the cover image separately as a jpeg in the Edit Metadata screen.QUOTE]
If you load the cover by Edit Metadata, how do you get it into the actual book file? Polish? If so is there any chance that you have the Polish set to do image compression? It will only do lossless compression, but still you might see a difference.
If that is not the case, I'd open the epub in the Editor and look at the cover image as it is in the book file: is it exactly the same file size and dimension as the original image? If not (for whatever reason) you can right-click on the cover image in the Editor and "replace file with..." to bring in the original image.
If it is indeed the original image, how is it coded in the cover html file (probably called titlepage.xhtml)? Polish will put it in with an svg wrapper, which should work fine.
If all that is correct...a viewer problem?
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