I've got an old iMac (2011) which I use as an external monitor from my MacBook Pro. Half of the screen is dimmed because of a known hardware problem

Is there a way to calibrate only one area of the monitor, to adjust brightness and match the two areas?

not my screen, but similar
(not my screen, but similar)

1 Answer 1


No - macOS applies calibration to the entire screen equally. Your best bet is to turn the Mac around and/or place an external display or remote in to that machine if you want to use the iMac as a proper computer.

In your case, this sadly is no longer fit for being an external display for your MacBook Pro.

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