Gamma correction is used to alter hardware colormaps to compensate
for the non-linearities in the phosphor brightness of monitors.
Gamma correction can be used to improve the "ropy" or modulated
appearance of antialiased lines. Gamma correction is also used to
improve the appearance of shaded graphics images as well as scanned
photographic images that have not already been gamma corrected.
For details on this feature, read the section "Gamma Correction"
found in Chapter 7 of the Graphics Administration Guide.
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