NAME

       RGBYIQ - Converts a color specification given in the RGB Red, Green, Blue, (RGB) color space to a color
       specification in the YIQ color space.

SYNOPSIS

       CALL RGBYIQ (R, G, B, Y, I, Q)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

       void c_rgbyiq (float r, float g, float b, float *y,
       float *i, float *q)

DESCRIPTION

       R           (REAL,  input,  range  [0.,1.])  represents the red intensity component of the input point in
                   RGB color space.

       G           (REAL, input, range [0.,1.])  represents the green intensity component of the input point  in
                   RGB color space.

       B           (REAL,  input,  range [0.,1.])  represents the blue intensity component of the input point in
                   RGB color space.

       Y           (REAL, output, range [0.,1.])  This is the color component of a  television  signal  that  is
                   shown  on  black-and-white  televisions;  Y  minimizes  the  effect  of  two colors appearing
                   different to the human eye but mapping to similar monochrome intensities.

       I           (REAL, output, range [-.6,.6]) attains its maximum when the input  triple  is  (1.,0.,0.);  I
                   attains its minimum when the input triple is (0.,1.,1.).

       Q           (REAL,  output,  range [-.52,.52]) attains its maximum when the input triple is (1.,0.,1.); Q
                   attains its minimum when the input triple is (0.,1.,0.).

C-BINDING DESCRIPTION

       The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

EXAMPLES

       Use the ncargex command to see the following relevant example: tcolcv, fcce02.

ACCESS

       To use RGBYIQ or c_rgbyiq, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably  in
       that order.

SEE ALSO

       Online: colconv, hlsrgb, hsvrgb, rgbhls, rgbhsv, yiqrgb, ncarg_cbind.

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                     RGBYIQ(3NCARG)