Adjust the contrast and brightness, and color balance of your monitor to ensure you are viewing the images as they are actually intended to look. The full process of calibration includes profiling your monitor i.e. creating an ICC profile that renders accurate color and requires third-party software. The viewing tip below excludes creating an ICC profile. It would be highly recommended nevertheless to profile your monitor with a suitable software.

To assist you a quick and easy calibration procedure is provided below that  will help you adjust the Black Point of your display and set the White Point consequently. This helps you eliminate any color cast, make your monitor grays as neutral as possible. By completing the simple process below you will have standardized your display of images.
Note: if you change any setting after completing the steps (if you change the room lighting, or readjust the brightness or contrast for example) you will need to re-calibrate your display.

To start calibrating:

• Make sure your monitor has been turned on for at least 20-30 minutes, that is important to stabilize the monitor display.

• Avoid direct light shining on your monitor in the first place.

• Make sure ambient light level is lower than your monitor display.

Next Step: Set the Black Level

• Turn up the brightness and contrast controls to their maximum setting.

• Using the 100% black area below adjust the brightness until the bar marked with W becomes the darkest gray in the row of gray bars. The bar marked with the letter M would almost blend into the background but is still discernable.

• Note: If your monitor seems to be unable to display the above requirements the ambient light level is most probably too high. Make necessary adjustments. 

• On a Mac use the bar marked with the letter M as the base point.

Next Step: Set the Color Balance or White Point

• While in the previous step the brightness control was used to adjust the black level, here the contrast control should be set to adjust the brightness.

• Reduce the contrast control to create a clean pure white in the 100% white below area.

• Use the light gray bars to maintain sharpness and highlight detail.

Calibration is complete!

You may want to check out a sample image to verify the adjustments you have made.
Note: there shouldn't be be any greenish or bluish or other type of color cast. If you have the impression the sample picture is too dark or bright you should re-calibrate your monitor.
Preview sample image