RGB to HSV 0

 1def RGBtoHSV(rgb):
 2    hsv = [0, 0, 0]
 3    trgb = list(rgb)
 4    trgb.sort()
 5
 6    min = trgb[0]
 7    max = trgb[2]
 8
 9    delta = float(max - min)
10    hsv[2] = max
11
12    if delta == 0:
13        # r = g = b = 0        # s = 0, v is undefined
14        hsv[1] = 0
15        hsv[0] = - 1
16    else:
17        hsv[1] = delta / max
18
19        if rgb[0] == max:
20            hsv[0] = (rgb[1] - rgb[2]) / delta        # between yellow & magenta
21        elif rgb[1] == max:
22            hsv[0] = 2 + (rgb[2] - rgb[0]) / delta    # between cyan & yellow
23        else:
24            hsv[0] = 4 + (rgb[0] - rgb[1]) / delta    # between magenta & cyan
25
26    hsv[0] *= 60                # degrees
27    if hsv[0] < 0:
28        hsv[0] += 360
29
30    return hsv