ncl_rgbhsv - Man Page

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

#include <ncarg/ncargC.h>

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

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.

The C-binding argument descriptions are the same as the FORTRAN  argument descriptions.

Use the ncargex command to see the following relevant examples:  tcolcv, fcce02.

To use RGBHSV or c_rgbhsv, 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, rgbyiq, yiqrgb, ncarg_cbind.

Hardcopy: NCAR Graphics Fundamentals, UNIX Version

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