http://www.macnn.com/articles/02/02/23/gamma.control/
Gamma Control 2.0 offers gamma calibration
updated 06:45 pm EST, Sat February 23, 2002
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Gamma Control 2.0 offers an the option to adjust the gamma curve of the screen under Mac OS X: "You can calibrate the screen for new ambiant conditions whithout having to use ColorSync Calibration Assistant. The settings you change are not saved into the current ColorSync profile and are restored when you quit Gamma Control."
