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Subroutine: GRSNCR

Purpose: set multiple color representations

Category: GRAPHICS

File: pgplot.src

Author: J. P. Terlouw

Use: see description below.

Description:

SUBROUTINE GRSNCR (CI, CR, CG, CB, N)
INTEGER CI, N
REAL CR(N), CG(N), CB(N)

GRPCKG: SET COLOUR REPRESENTATION -- define the colour to be
associated with a colour index. Ignored for devices which do not
support variable colour or intensity. 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 colours or monochrome intensities available;
the nearest available colour is used.

Arguments:

CI (integer, input): first colour index. If any colour index is
outside the range available on the device, the call is ignored.
Colour index 0 applies to the background colour.
CR, CG, CB (real array, input): red, green, and blue intensities,
in range 0.0 to 1.0.
N (integer, input): number of colour indices to be modified.

This subroutine is an extension of GRSCR, which allows one
color index to be modified. It is only called by PGSNCR.

Updates: Sep 3, 1999: JPT document created.