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I have a Retina MacBook Pro (mid-2015), powering an Apple Cinema Display 24" monitor, and a run-of-the-mill, cheap and inaccurate Samsung monitor (when it comes to color). I've connected both of these displays to the RMBP via Thunderbolt.

Now, since the color accuracy is pretty weak on the Samsung monitor - I'm trying to figure out how to use macOS Sierra to change that, and that monitor only, to grayscale. I would only use it to display information that can be viewed in grayscale (Slack chats, email, Terminal, logs, Mixpanel/Geckoboard analytics, you know, not browse websites). I am well aware that the Accessibility -settings in System Preferences can be applied so that each of the three screens is grayscale. I'm not looking for that. If I was looking for that, I'd just launch a Grayswicha-app I made with AppleScript.

I'm looking to set the Samsung, and only the Samsung, to grayscale.

Is there some way of doing this?

Would really appreciate any assistance on this.

PS Not looking for "change all your apps to be grayscale, and then if you want the same app to be colored too on a different display, do another profile/alias for each and every one of the apps, then run it with the color... oh hang on that's a great deal of work, do it anyway cos this is a good solution" -type solutions :(

  • @Allan Yeah, I originally read it as 'proxy' too, but it's poxy, as in something that's worthless. I assume the OP is thinking it will work better if it's being used a monochromatic screen rather than a colour screen. – Monomeeth Jun 14 '17 at 10:48
  • @Monomeeth - I see what you're saying, but I didn't get any of that from the post. Proxy is "substitute for" or "act on another's behalf" (i.e. proxy server) and he didn't say why he thought there would be a benefit to it being mono. – Allan Jun 14 '17 at 10:57
  • @Allan Yeah, the context behind the question is rather vague. In fact, looking at it again, it reads to me like it could be an XY problem. – Monomeeth Jun 14 '17 at 11:07
  • Greyscale setting is available in the Accessibility Settings page, however it will affect all monitors not just one. – jmhindle Jun 14 '17 at 14:44
  • I wonder if you could accomplish this by setting really weird values in "Calibrate Color"... – Wowfunhappy Jun 14 '17 at 20:28

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