Monitor Calibration — Mac OS
How to calibrate your Mac monitor using the System Preferences Display dialogue.
System Preference
Go to System Preferences (under the Apple menu or in your dock)
Choose Displays (in the Hardware row)
Next click the Color tab
Display Calibrator Assistant
You will see a list of Display Profiles (once you have created profiles you can switch between them here)
Click the Calibrate… button on the lower right
You will be taken through the process step-by-step. Expect it to take a few minutes as you fine-tune the settings.
In the final step you will be asked to name your new monitor profile. It is helpful to name your profile to remind you of the lighting environment in which it was created (time of day, location, etc) so that you can later easily switch profiles to suit your viewing environment.

