rgb_to_hsv
Converts color values between the HSV and RGB colorspaces.
Description
void rgb_to_hsv(int r,
int g,
int b,
float *h,
float *s,
float *v
);
Convert color values between the HSV and RGB colorspaces. The RGB values
range from 0 to 255, hue is from 0 to 360, and saturation and value are
from 0 to 1. Example:
int r, g, b;
float hue, saturation, value;
...
/* Convert a reddish color to HSV format. */
rgb_to_hsv(255, 0, 128, &hue, &saturation, &value);
/* Now put our tin foil hat, and verify that. */
hsv_to_rgb(hue, saturation, value, &r, &g, &b);
ASSERT(r == 255);
ASSERT(g == 0);
ASSERT(b == 128);
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