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# HSV: Hue, Saturation, Value
# H: position in the spectrum
# S: color saturation ("purity")
# V: color brightness
def rgb_to_hsv
(r, g, b):
    maxc = max
(r, g, b)
    minc = min
(r, g, b)
    rangec = (maxc-
minc)
    v =
 maxc
    if minc ==
 maxc:
        return 0.0, 0.0
, v
    s = rangec /
 maxc
    rc = (maxc-r) /
 rangec
    gc = (maxc-g) /
 rangec
    bc = (maxc-b) /
 rangec
    if r ==
 maxc:
        h = bc-
gc
    elif g ==
 maxc:
        h = 2.0+rc-
bc
    else
:
        h = 4.0+gc-
rc
    h = (h/6.0) % 1.0
    return
 h, s, v