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This version passes the NS version of the UIColorTests. However, it fails the NS version of the UIImageTests. This is possibly due to the size of the analysed image being different to the iOS version (see #5). I played around with some ideas but couldn't get the tests to pass so figured I'd enlist some help or advice through a pull request. The returned background, primary, secondary and detail colours are not far from the iOS versions but not close enough to pass the tests.