HOW TO ADJUST YOUR MONITOR
(Brightness & Contrast Controls)
Gray Scale
You should see all ten bars with a linear increase in contrast.
Gamma Scale
Step back from your monitor and the number you see in the in the
block that blends
with the background is your gamma setting. Most Web photographers
use 1.8.
Adjust your brightness and contrast for optimum setting.
Go to the source of this page: http://zonezero.com/calibration/english.html
Gamma
Correction Explained: http://www.cgsd.com/papers/gamma_intro.html