| Colconv(3NCARG) | NCAR GRAPHICS | Colconv(3NCARG) |
NAME¶
Colconv - Allows a user to convert among the color models RGB, HSV, HLS, and YIQ.
SYNOPSIS¶
HLSRGB - Converts a color specification given as Hue, Lightness, and Saturation (HLS) values to Red, Green, and Blue (RGB) intensity values in the RGB color space.
HSVRGB - Converts a color specification given in the Hue, Saturation, and Value (HSV) color space to color values in the Red, Green, Blue (RGB) color space.
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.
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.
RGBYIQ - Converts a color specification given in the RGB Red, Green, Blue, (RGB) color space to a color specification in the YIQ color space.
YIQRGB - Converts a color specification given in the YIQ color space to the equivalent color specification in the Red, Green, Blue (RGB) color space.
C-BINDING SYNOPSIS¶
#include <ncarg/ncargC.h>
c_hlsrgb
c_hsvrgb
c_rgbhls
c_rgbhsv
c_rgbyiq
c_yiqrgb
ACCESS¶
To use Colconv or c_colconv routines, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.
MESSAGES¶
When error conditions are detected, the support routine SETER is called in such a way that it writes a message to the standard error file (as defined by I1MACH(4)) and then terminates execution. The possible error messages are as follows:
- HLSRGB - L out of range
- Lightness is less than 0. or greater than 100.
- HLSRGB - S out of range
- Saturation is less than 0. or greater than 100.
- HSVRGB - S out of range
- Saturation is less than 0. or greater than 1.
- HSVRGB - V out of range
- Value of input color is less than 0. or greater than 1.
- RGBHLS - R out of range
- Value of red intensity component is less than 0. or greater than 1.
- RGBHLS - G out of range
- Value of green intensity component is less than 0. or greater than 1.
- RGBHLS - B out of range
- Value of blue intensity component is less than 0. or greater than 1.
- RGBHSV - R out of range
- Value of red intensity component is less than 0. or greater than 1.
- RGBHSV - G out of range
- Value of green intensity component is less than 0. or greater than 1.
- RGBHSV - B out of range
- Value of blue intensity component is less than 0. or greater than 1.
SEE ALSO¶
Online: hlsrgb, hsvrgb, rgbhls, rgbhsv, 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.
| March 1993 | UNIX |