Converts an RGB color value to HSV
Assumes: r, g, and b are contained in the set [0, 255] or [0, 1] Returns: { h, s, v } in [0,1]
Converts an RGB color value to HSV
Assumes: r, g, and b are contained in the set [0, 255] or [0, 1] Returns: { h, s, v } in [0,1]