My imac screen wont display very light tints of colours or show the banding in file windows

My imac screen wont display very light tints of colours, but the same file is showing the tints on another imac. I have calibrated my screen, but no change any ideas what is causing this? it also happens on open windows where you should be able to see str

Thanks for posting this. I've been having the same issues myself for a long time and I couldn't suss it out. Like your mac, my contrast setting had been increased too - must have accidently hit the keyboard shortcut. It was also affecting my vision too. The difference is massive.... thanks

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