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First, adjust screen contrast to maximum, then
reduce it until you see a separation between the white (farthest left) and
the light gray blocks next to it.
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Then, adjust the brightness until you see a
separation between the black and dark gray blocks on the far right. The
black block (farthest right) should be as black as possible.
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Finally, look for any color cast in the white
and gray tones -- they should appear neutral in color. Monitors tend to have
a magenta cast to them until they have warmed up for about 30 minutes, so if
the bar looks pinkish to you, wait a bit if you want to see colors more
accurately.
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