Name:         PGSCR

Purpose:      set color representation

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE PGSCR (CI, CR, CG, CB)
            INTEGER CI
            REAL    CR, CG, CB
      
       Set color representation: i.e., define the color to be
       associated with a color index.  Ignored for devices which do not
       support variable color or intensity.  Color indices 0-15
       have predefined color representations (see the PGPLOT manual), but
       these may be changed with PGSCR.  Color indices 16-maximum have no
       predefined representations: if these indices are used, PGSCR must
       be called to define the representation. On monochrome output
       devices (e.g. VT125 terminals with monochrome monitors), the
       monochrome intensity is computed from the specified Red, Green, Blue
       intensities as 0.30*R + 0.59*G + 0.11*B, as in US color television
       systems, NTSC encoding.  Note that most devices do not have an
       infinite range of colors or monochrome intensities available;
       the nearest available color is used.  Examples: for black,
       set CR=CG=CB=0.0; for white, set CR=CG=CB=1.0; for medium gray,
       set CR=CG=CB=0.5; for medium yellow, set CR=CG=0.5, CB=0.0.
      
       Argument:
        CI     (input)  : the color index to be defined, in the range 0-max.
                          If the color index greater than the device
                          maximum is specified, the call is ignored. Color
                          index 0 applies to the background color.
        CR     (input)  : red, green, and blue intensities,
        CG     (input)    in range 0.0 to 1.0.
        CB     (input)

Updates:      Oct 16, 1998: JPT automatically extracted from source.