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Gamma Correction Color monitors, which are by nature non-linear, appear
incorrect when given a linear ramp of some color. Gamma
correction can significantly improve perceptual correctness
by adjusting the brightness or darkness of the color data
sent from the monitor to any other non-linear device.
Gamma Correction
Command ?*t#I
# = Gamma number
Default = 0 (gamma correction off)
Range = 0.0 to 32767.0 (command is ignored
for invalid values) *
* The practical range for gamma values is 0.0
to 4.0.
Assuming 8 bits per primary (256 intensity levels per
primary), the corrected intensity for each color primary is
calculated as follows:
Intensity = ( (1 + log (input / 255) ) / gamma) * 255
Gamma correction is referred to in terms of device-
dependent RGB. This command does not destroy the
contents of device-dependent color lookup tables, but
setting a gamma value supercedes any lookup table input
in either Device CMY or Device RGB.
Note The default value (0) gives the same result as a gamma
value of 1.0, which results in a unity gamma curve.
Modifying Output Color 4-15Modifying Output Color 4-15