PIXCOLOR

       Assign colors to specified pixel values in a color lookup table

       PIXCOLOR, pixvalue, color         ;Set color at specified pixel values

       pixvalue - value or range of pixel value whose color will be modified.
               A single pixel value may be specified by an integer
               If a range of values is specified, then it must be written
               as a string, with a colon denoting the range (e.g.'102:123')
               If omitted, program will prompt for this parameter.
       color -    single character string giving specified color values.
               Available options are 'R' (red), 'B' (blue), 'G' (green)
               'Y' (yellow), 'T' (turquoise), 'V' (violet), 'W' (white)
               or 'D' (dark).  If omitted, program will prompt for this
               parameter.

       None

       TVLCT is used in RGB mode to load the specified pixel values.

       Set pixel values of 245 to a color of red
       IDL> pixcolor,245,'R'

       Written, W. Landsman ST Systems Corp.           February, 1987
       Converted to IDL V5.0   W. Landsman   September 1997

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