iMac 5k Retina display 27" late 2015 - Calibration 2023

@photographyjunkie  An iMac doesn’t have self calibration, it has no built-in sensor to measure colour

Calibrite is a kind of branch of X-Rite it seems.

- use the i1 device (or whatever sensor) you have and set the white point calibration target to something that doesn't look cool to you, maybe start out at 6000K. You'll need to experiment with numbers close to that until you like the white colour. 

As a reference target for appearance I use this. 

I believe that the ONLY way to be sure of display appearance is by matching an ISO certified proof print. 

If you want better software to use with your i1 have a look at this software  there's a free 14 day demo so you can test drive it.

unless your iMac display has reached the end of life and is incapable of being calibrated correctly (usually this manifests as an inability to reach the luminance level you want) there's no need to replace it. You'd be in the same boat with a new one - it would still need calibration/ profiling. 

If you've had that sensor since 2015 that’s a long time it could be faulty. Only way to test that is against a visual reference after calibration / profiling the display system. 

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management

I have been using my imac 5k retina display late 2015 for a little over 6 years.  I've recently run into calibration issues with display.  I had always used i1Profiler to calibrate but now they are owned by a different company..... 

By @photographyjunkie

That was not a big change. The “different company” (Calibrite) is related to X-Rite.

I also have an X-Rite color device that is many years old, and it took me a little while to figure this out for myself too. The fact is that the new Calibrite company still offers software support for these devices. Although i1 Profiler is no longer updated, Calibrite now offers ccProfiler and ccStudio software for X-Rite color devices. Go to the software downloads page below and see if your device is supported by ccProfiler or ccStudio. Mine is, so I can keep using it on my current Mac and the download was free.

https://calibrite.com/us/software-downloads/

There is no callibration button to use on my imac model.

By @photographyjunkie

There probably still is, but you’ll get better results by using your color profiling device instead.