the midrange tones of photographs or game scenes often appear too dark due to technically inevitable non-linearities in the brightness of crt screens, or as a result of a variety of image compression algorithms. attempts to compensate these errors using the brightness and contrast controls generally available on monitors usually results in an overall worsening of the display quality. generally the brighter parts of the image will be washed out, or the image as a whole will appear too hard.
color correction affects the processing of image information on the graphics board (i.e. before the signal reaches the monitor), thus permitting a targeted adjustment of the midrange brightness. as a result, you can then take advantage of the full contrast and brightness ranges of your monitor.
