/* Now allocate a ramp of colors from the main color to the background. */
rgb_to_hsv (start.red, start.green, start.blue, &h1, &s1, &v1);
rgb_to_hsv (end.red, end.green, end.blue, &h2, &s2, &v2);
/* Now allocate a ramp of colors from the main color to the background. */
rgb_to_hsv (start.red, start.green, start.blue, &h1, &s1, &v1);
rgb_to_hsv (end.red, end.green, end.blue, &h2, &s2, &v2);