Under the 0% column, there should be NO color, just plain bright white. If it is gray or dingy or has a color cast, adjust your monitor until that area is plain white. Under the 100% column, the colors should be recognizable process colors with a full rich representation. If they appear washed out, your monitor is probably set too bright.

This should give you the truest possible colors for the color swatches of Select Shades, however, there can still be slight differences due to the actual product you use Select Shades in.