ncl_colconv man page

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

Info

March 1993 UNIX NCAR GRAPHICS