Adjust the gamma curve of your screen.
Gamma Control is an application that gives you the possibility to adjust the gamma correction curve of the screen. Use the application to calibrate the screen for new ambient conditions without having to use the ColorSync Calibration Assistant. You can save your multiple settings in documents and retrieve them when needed. The settings you change are not saved into the current ColorSync profile and are restored when you quit Gamma Control.
Updated on Oct 20 2020