HLSRGB - Converts a color specification given as Hue, Lightness,
and Saturation (HLS) values to Red, Green, and Blue (RGB) intensity
values.
CALL HLSRGB ( H, L, S, R, G, B )
#include <ncarg/ncargC.h>
void c_hlsrgb (float h, float l, float s, float *r,
float *g, float *b)
- H
- (REAL, input, range [0.,360.) ) represents the hue of the input color in
HLS color space. H=0. corresponds to blue.
- L
- (REAL, input, range [0.,100.]) represents the lightness value of the input
color in HLS color space. Lightness is a measure of the quantity of light
- a lightness of 0. is black, and a lightness of 100. gives white. The
pure hues occur at lightness value 50.
- S
- (REAL, input, range [0.,100.]) represents the saturation value of the
input color in HLS color space. Saturation is a measure of how much white
light is mixed with the color. Colors having a saturation value of 0.
represent grays with a gray intensity value equal to the lightness L.
Colors with a saturation value of 100. are fully saturated colors. The hue
is undefined when S=0. The fully saturated pure hues occur when S=100. and
L=50.
- R
- (REAL, output, range [0.,1.]) represents the red intensity component of
the output color in RGB color space.
- G
- (REAL, output, range [0.,1.]) represents the green intensity component of
the output color in RGB color space.
- B
- (REAL, output, range [0.,1.]) represents the blue intensity component of
the output color in RGB color space.
The C-binding argument descriptions are the same as the FORTRAN
argument descriptions.
Use the ncargex command to see the following relevant examples:
ccpcldm, ccplbam, ccpllb, ccplll, ccpllw, colcon, fcce02.
To use HLSRGB or c_hlsrgb, load the NCAR Graphics libraries ncarg,
ncarg_gks, and ncarg_c, preferably in that order.
See the colconv man page for a description of all Colconv error
messages and/or informational messages.
Online: colconv, hlsrgb, hsvrgb, rgbhls, rgbhsv, rgbyiq, yiqrgb,
ncarg_cbind.
Hardcopy: NCAR Graphics Fundamentals, UNIX Version
Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.