SYNOPSIS

CALL RGBHSV (R, G, B, H, S, V)

C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>

void c_rgbhsv (float r, float g, float b, float *h,
float *s, float *v)

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.

H

(REAL, output, range [0.,360.) ) represents the hue of the input point in HSV color space. A value of (R,0.,0.) in the input space will result in a hue of 0. in the output space.

S

(REAL, output, range [0.,1.]) represents the saturation value of the input point in HSV color space. Saturation is a measure of how much white light is mixed with the color. Saturation values of 0. represent grays (with a gray value equal to V). Saturation values of 1. are fully saturated colors. The hue is technically undefined when S=0.; the code leaves H at its previous value when S=0. (0. initially). The fully saturated pure hues occur when S=1. and V=1.

V

(REAL, output, range [0.,1.]) represents the value in HSV space.

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 examples: tcolcv, fcce02.

ACCESS

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

MESSAGES

See the colconv man page for a description of all Colconv error messages and/or informational messages.

COPYRIGHT

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