The fact is that this is a problem you can't really solve. Karabiner app for mac. The human eye is just too good at picking even the slightest differences.
So - given that, what can we do to mitigate the problem - i.e. Install mac app on ubuntu. what is best practise?
Some monitor calibration software has a feature that allows you to load up a profile made for one monitor into the other. In theory, this should mean the secondary screen knows more about the primary, and adapts itself to it. In practise, though, I've never seen this work even vaguely well.
So - the best practise is to designate one screen - your best screen - as your primary reference monitor for colour work. Then, calibrate any other screens 'to' that reference screen for the best visual match. And typically, we recommend doing this, but to a slightly lower brightness level - just to make sure your eyes' response is biased towards the primary screen.
What this means, in practise, is manipulating the calibration target of the secondary screen in any way you can to increase the visual match. So, for example, on our primary services station here we currently (Jan 2019) have two monitors in use - an Eizo CG2730 and a BenQ SW240.
The BenQ is amazing for its price, but it's just not up to the level of an Eizo CG screen. So we designate the Eizo screen as the primary reference monitor and calibrate that to our usual fine art printing target (90 cd/m2, 5800 K white, 0.4 black, gamma 2.2, full native gamut).
In general, on a Mac, multi monitor calibration just works. Mac video cards must support separate LUTs for each video output to be allowed to work with the Mac system. Just drag your profiling app to each screen in turn, perform the calibration, and you should be done. With the Activity Monitor app in macOS, you can force quit misbehaving apps, find out how much energy your Mac is using, and see which apps or processes are eating the most processor cycles.
Initially, we calibrate the BenQ to the same settings, except we lower the brightness to 80 cd/m2 to help our eyes white balance of the primary screen. After this initial calibration is completed, we visually assess the match with the Eizo monitor - the best way to do this is to use a continuous tone test image (like the famous PDI printer test image) - rather than just looking at your desktop or large blocks of single colours - as the goal is to improve the match with overall colourreproduction, not just the reproduction of specific tones (unless, of course, you have a particular family of tones of critical importance to you - in which case use an image with those tones of course!).
With the PDI or similar displayed, check for overall issues:
Top mac productivity apps downloads. In all cases, you're manipulating the calibration target arbitrarily simply to increase the visual match.
Once you've done the best you can..that's it! There really isn't more you can do. It's simply an unfortunate fact of life that this is a problem that is not truly solvable. Marvel, and curse, at the amazing human eye.
(N.B. this issue is another powerful argument in favour of buying one really big, great monitor rather than, say, two smaller ones!)
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All that being said - once you have done this, you can normally achieve a thoroughly workable result - just remember to do all your colour work on the primary screen. This is what we do here, and it works very well.
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