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					Originally Posted by  BetterRed
					 
				 
				... I wondered if it could be an IOS specific side-effect of the the recent deprecation of image-magik in favour of QtImage in calibre version 2.57.1.  ... 
			
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 That would be "MacOSX" rather tha "IOS", but I agree that is could very well be an issue descending from the changes made related to the omission of image-magik. The recent releases of the MacOSX have new routines for scaling screen entities related to the now wide range of pixel densities brought on by the "Retina" screens.