Although many computers with varying screen characteristics are in use, having some kind of calibration method will help in promoting a unified presentation. This chart is an attempt to allow adjustment of your monitor to maximize it's gray scale and color fidelity.

  The top gray scale gradation is all 256 available steps, next is a 51 percent gray matched to the background, then 9 steps of gray between solid Black and White.   Below that is an attempt at a spectrum. At the bottom are strips of pure Blue, Green, and Red with White and Black added.