ncl_rgbyiq (3) - Linux Manuals

ncl_rgbyiq: Converts a color specification given in the RGB

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.

COPYRIGHT

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