For optimal viewing of the images on these pages, you will need to adjust your monitor to the grayscale step tablet shown below.  

Adjust the brightness and contrast controls of your monitor so that you can see each step separately.  Make the darkest step as dark as possible while still being able to distinguish it from the next lighter step.  If you can accomplish this with your monitor contrast set to maximum then do so.  The background on this page should be medium blue.  If it has a color tint to it, then adjust your monitor's color balance.