; RGBGAMMA
;---------------------------------------------------------------
;! specifies the desired color gamma corrections
;# ADVERB TV HARDCOPY
;-----------------------------------------------------------------------
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;-----------------------------------------------------------------------
RGBGAMMA  LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
RGBGAMMA
Type: Adverb  (Real array(3))
Use:  Array used to specify a red, green, blue (resp.) gamma correction.
      Most display devices do not produce a linear appearance for a
      linear input.  If input values, range from 0 to 1, the gamma
      correction causes (input ** (1/gamma)) to be sent to the device.
      The higher the gamma, the more "pastel" the appearance of color.
      Typical values for workstations are around 2.  Try the verb
      GAMMASET to see the effect of the gamma correction.
Null value:
      RGBGAMMA(1) = 0 => use gamma of the TV display.
      RGBGAMMA(2) = 0 => use RGBGAMMA(1)
      RGBGAMMA(3) = 0 => use RGBGAMMA(1)
Verbs:
   GAMMASET...Play with TV gamma correction (setting it on button C if
              you know the Manager password).  Sets RGBGAMMA.
Tasks:
   LWPLA......Translates plot file(s) to a PostScript printer or file.
   TVRGB......Display 3-color images on TV displays.  RGBGAMMA is used
              on any PostScript output.
Procedure:
   CIRCLEVS...Sets RGBLEVS to fill LEVS with a circular color scheme.
   FLAMLEVS...Sets RGBLEVS to fill LEVS with a red flame color scheme.
   RAINLEVS...Sets RGBLEVS to fill LEVS with a rainbow color scheme.
   STEPLEVS...Sets RGBLEVS to fill LEVS with a repeated sequence of
              colors.
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