NAME¶
RGBHSV - Converts a color specification given in the Red, Green, Blue (RGB)
color space to color values in the Hue, Saturation, and Value (HSV) color
space.
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.
SEE ALSO¶
Online: colconv, hlsrgb, hsvrgb, rgbhls, rgbyiq, 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.