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ncl_rgbhls
Langue: en
Version: 160323 (fedora - 05/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
RGBHLS - Converts a color specification given in the Red, Green, Blue (RGB) color space to color values in the Hue, Lightness, Saturation (HLS) color space.SYNOPSIS
CALL RGBHLS (R, G, B, H, L, S)C-BINDING SYNOPSIS
#include <ncarg/ncargC.h>void c_rgbhls (float r, float g, float b, float *h,
float *l, float *s)
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 HLS color space. A value of (0.,0.,B) in the input space will result in a hue of 0. in the output space.
- L
- (REAL, output, range [0.,100.]) represents the lightness value of the input point 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, output, range [0.,100.]) represents the saturation value of the input point in HLS 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 the lightness value L). Saturation values 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. The saturation value should be thought of as a percentage.
EXAMPLES
Use the ncargex command to see the following relevant examples: tcolcv, fcce02.C-BINDING DESCRIPTION
The C-binding argument descriptions are the same as the FORTRAN argument descriptions.ACCESS
To use RGBHLS or c_rgbhls, 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, rgbhsv, rgbyiq, yiqrgb, ncarg_cbind.Hardcopy: NCAR Graphics Fundamentals, UNIX Version
COPYRIGHT
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The use of this Software is governed by a License Agreement.
Contenus ©2006-2024 Benjamin Poulain
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