Colconv - Allows a user to convert among the color models RGB, HSV, HLS, and YIQ.

       To use Colconv or c_colconv routines, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c,
       preferably in that order.

       #include <ncarg/ncargC.h>

       c_hlsrgb
       c_hsvrgb
       c_rgbhls
       c_rgbhsv
       c_rgbyiq
       c_yiqrgb

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                    Colconv(3NCARG)

       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.

       Colconv - Allows a user to convert among the color models RGB, HSV, HLS, and YIQ.

       Online: hlsrgb, hsvrgb, rgbhls, rgbhsv, rgbyiq, yiqrgb, ncarg_cbind.

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

       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.