That’s image retention, not burn in. It’s not permanent, though still very annoying.
Do you have the 2012 15" Retina MacBook Pro? Some of those (those with LG screens) were suffering horribly from image retention. I got the screen exchanged twice on mine. Now I luckily have the Samsung screen.
There are currently no known cases of image retention with this iMac. It looks as though they got the issue under control and this was really a first gen (large screen) retina tech problem. (Retina iPads were or maybe still are suffering from image retention, too, though, strangely, with my iPad 3 I care much less about that, for whatever reason. It’s also a bit more mild.)
Do you have the 2012 15" Retina MacBook Pro? Some of those (those with LG screens) were suffering horribly from image retention. I got the screen exchanged twice on mine. Now I luckily have the Samsung screen.
There are currently no known cases of image retention with this iMac. It looks as though they got the issue under control and this was really a first gen (large screen) retina tech problem. (Retina iPads were or maybe still are suffering from image retention, too, though, strangely, with my iPad 3 I care much less about that, for whatever reason. It’s also a bit more mild.)