Cabel Sasser of Panic shared something interesting on Twitter yesterday. He said that running the following command will highlight images that haven't been upscaled by doubling their size:
defaults write -g CGContextHighlight2xScaledImages YES
I don't have a retina MacBook Pro to test this, but this should be useful for developers, or simply for others who want to see which images are native retina resolution and which are not.
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