Calibrating your monitor ensures that you see what everyone else sees. Generally it's a good idea to turn off the gamma and color correction in your image editor, and make these corrections system-wide. This way an image will look the same in your browser as it will in your editor.

Gamma Calibration
Gamma Image

Gamma Image

Turn Contrast to maximum.  Adjust Brightness until all 20 shades are visible in each table.
RGB Gamma Calibration Applet

* Functionality reduced because Java is off.

View pattern with gamma:
Adjust the monitor brightness and colors until the center squares blend in. Windows systems are normally calibrated to a gamma of 2.5, Macintosh 1.7. Controls for this Touchup applet require Java and JavaScript to be on.

Related Links
The Amazing Gamma Measuring Applet determine your monitor's gamma (Windows default 2.5)
Luminous Landscape System Colour Calibration
shAf's display management page Definitions and calibration
Monitor Tests Test your monitor online with PC Magazine and DisplayMate
Accurate Image Manipulation Timo Autiokari's controversial color calibration

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