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Step 10 - Target Response
This step allows the user to specify the target gamma for this profile.
There are two choices for target response curves:
Selecting "Gamma Curve" will activate the slider and allow the user to select a specific gamma value.
Selecting "Perceptual L*" produces a curve that accurately compensates for human vision's nonlinear perceptual response to luminance. To put it in simpler terms, it produces a curve where the magnitude of the difference between steps appears uniform. For example, the magnitude of the difference between 0% and 10% appears equal to the magnitude of the difference between 40% and 50%, which appears equal to the magnitude of the difference between 90% and 100%.
For users that are new to calibration, the target response is not specific to a particular type of display device. For example, you do not set a particular gamma because you have an LCD or because you have a projector. The target gamma is related to the type of content that you are creating, such as print or video. If you are in doubt and you are simply using your Mac in normal usage, choose the 2.2 gamma setting.