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rgb2hsl = (r,g,b) ->
if r != undefined and r.length >= 3
[r,g,b] = r
r /= 255
g /= 255
b /= 255
min = Math.min(r, g, b)
max = Math.max(r, g, b)
l = (max + min) / 2
if max == min
s = 0
h = Number.NaN
else
s = if l < 0.5 then (max - min) / (max + min) else (max - min) / (2 - max - min)
if r == max then h = (g - b) / (max - min)
else if (g == max) then h = 2 + (b - r) / (max - min)
else if (b == max) then h = 4 + (r - g) / (max - min)
h *= 60;
h += 360 if h < 0
[h,s,l]
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