HOW TO ADJUST YOUR MONITOR
(Brightness & Contrast Controls)
You should see all ten bars with a linear increase in contrast.
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
Correction Explained: http://www.cgsd.com/papers/gamma_intro.html