color setting for Imac

@Jean278799110vkv Please be more specific, are you referring to the iMacs settings (in System Settings/ displays) or to the settings used in Photoshop's Color Settings dialog?

As @D Fosse wrote, There is no such thing as "best setting for your screen". I agree that the best way to "set the screen, is to use a hardware calibrator such as the i1 display pro. 

The "best setting" is the right one for your particular circumstances

As @Conrad_C wrote, you might be OK with the "iMac" profile or, if you don’t see that, "Color LCD" selected in the mac's System Settings/ displays.

The  options in Photoshop's Color Settings dialog are generally based on your workflow, your reason for making images - is it for offset print? or maybe for Internet use? 

Which specific settings were you looking for help with? 

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
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You probably don’t need to change anything in Photoshop, unless you do print work and your print service provider has given you specific color setup advice.

On the Apple iMac, in System Settings > Display, the selected color profile should be iMac, or if you don’t see that in the list, choose Color LCD. Those should work fine for most things.

If you bought display profiling hardware and software, when you run it, it will automatically create and install a customized display profile and you can leave it set to that.

If you are asking what settings to use in the display profiling software, that depends on your graphic design work. If you mostly do graphics for website and mobile devices, a white point of 6500K and luminance of around 150 candelas per square meter (also called nits) is reasonable.

If you mostly do graphics for printing on a press, consider lowering the luminance to between 100-120 cdm2, and consult with your print service provider as to whether your display’s white point should be set to D65 or D50.

There is no such thing as "best setting for your screen". You use a calibrator to make a monitor profile for your screen. That profile needs to describe the actual and current behavior of your screen, and the calibrator does this by measuring.

The monitor profie is handled by the operating system, and Photoshop loads whatever profile it gets from the operating system at application startup. No user intervention.

Photoshop Color Settings deal with profiles on document level, which is unrelated to the monitor profile. The whole point of color management is that those two are divorced and do not need to match.

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

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