|This target was
designed to allow computer users to adjust the contrast
and brightness of their computer monitor so that graphic
images, such as scans of photographs, textual documents,
or maps, look their best. After making the gamma
adjustments above, the target below should be clear.
The target consists
of two scales of shades of gray ranging from white to
black. The top scale illustrates the full range of tones
that a computer monitor can represent when set to 256 or
more colors (8 bits or higher). The lower scale consists
of three sets of shades, including two dark shades,
three middle gray shades and two light shades. The
shades in each set on the lower scale should be just
distinguishable from the adjacent similar shade(s).
The contrast and
brightness control on your monitor adust the appearance
of the top scale. You should see a broad range of shades
from white to black and all seven shades on the lower
scale should be distinguishable.