Computer monitor (CRT) gamma measurement and adjustment

[image for measuring computer monitor gamma]
The number under the bar with equal brightness top and bottom is the gamma for your current display setup. The gamma for a properly adjusted system is 1. If the contrast, brightness and gamma are properly set, the figure below will have nine vertical bars, each a constant brightness half that of the bar on the left. For an in depth discussion of gamma correction, see http://www.inforamp.net/~poynton/notes/colour_and_gamma/GammaFAQ.html

[image to test computer monitor gamma]