hsvrgb.py

def rgb2hsv(r, g, b):
	v = max(r,g,b)
	l = min(r,g,b)
	sxf = (1.0 / 6)
	trd = (1.0 / 3)
	
	# actual start
	s = l / v;
	
	# actual distance
	d = v - l
	
	r = (r - l) / d	
	g = (g - l) / d
	b = (b - l) / d
	
	h = 0
	
	if (r == 1):
		if (b > 0): h += sxf * (1 - b)
		if (g > 0): h += sxf * (1 + g)
	elif (g == 1):
		h += trd
		if (r > 0): h += sxf * (1 - r)
		if (b > 0): h += sxf * (1 + b)
	
	elif (b == 1):
		h += 2 * trd
		if (g > 0): h += sxf * (1 - g)
		if (r > 0): h += sxf * (1 + r)
		
	h -= sxf
	if (h < 0): h += 1
	
	return (h, s, v)
	
def hsv2rgb(h, s, v):
	r = 0
	g = 0
	b = 0

	sxf = (1.0 / 6)
	trd = (1.0 / 3)

	h += sxf
	
	if (h > 1): h -= 1.0
		
	if (h < trd):
		r = 1.0
		if (h < sxf):
			b = 1.0 - (h / sxf)
		else:
			g = ((h - sxf) / sxf)
	elif (h < 2 * trd):
		g = 1.0
		h -= 1 * trd
		if (h < sxf):
			r = 1.0 - (h / sxf)
		else:
			b = ((h - sxf) / sxf)
	else:
		b = 1.0
		h -= 2 * trd
		if (h < sxf):
			g = 1.0 - (h / sxf)
		else:
			r = ((h - sxf) / sxf)
	c = (s * v)
	r = c + (r * (v - c))
	g = c + (g * (v - c))
	b = c + (b * (v - c))
	
	return (r,g,b)
	
	

print (hsv2rgb(1.0/12, 0.5, 0.5))