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The chart shows the 16 major greyscales (of the 255 available), created through html code.

You should be able to see all the shades on this chart

Try varying the brightness on your monitor

Check the temperature color of your monitor

If that does not help, play with the other settings on your monitor's menu

The above numbers and letters corespond with html coding for determining color

greyscale chart

Blue Scale
Red Scale
Green Scale

256 Greyscale

Vectorscope
Vectorscope: used to determine precicely the color in a broadcast video image.