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Python methods to convert colors between RGB, HSV and HSL
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import math | |
def rgb_to_hsv(r, g, b): | |
r = float(r) | |
g = float(g) | |
b = float(b) | |
high = max(r, g, b) | |
low = min(r, g, b) | |
h, s, v = high, high, high | |
d = high - low | |
s = 0 if high == 0 else d/high | |
if high == low: | |
h = 0.0 | |
else: | |
h = { | |
r: (g - b) / d + (6 if g < b else 0), | |
g: (b - r) / d + 2, | |
b: (r - g) / d + 4, | |
}[high] | |
h /= 6 | |
return h, s, v | |
def hsv_to_rgb(h, s, v): | |
i = math.floor(h*6) | |
f = h*6 - i | |
p = v * (1-s) | |
q = v * (1-f*s) | |
t = v * (1-(1-f)*s) | |
r, g, b = [ | |
(v, t, p), | |
(q, v, p), | |
(p, v, t), | |
(p, q, v), | |
(t, p, v), | |
(v, p, q), | |
][int(i%6)] | |
return r, g, b | |
def rgb_to_hsl(r, g, b): | |
r = float(r) | |
g = float(g) | |
b = float(b) | |
high = max(r, g, b) | |
low = min(r, g, b) | |
h, s, v = ((high + low) / 2,)*3 | |
if high == low: | |
h = 0.0 | |
s = 0.0 | |
else: | |
d = high - low | |
s = d / (2 - high - low) if l > 0.5 else d / (high + low) | |
h = { | |
r: (g - b) / d + (6 if g < b else 0), | |
g: (b - r) / d + 2, | |
b: (r - g) / d + 4, | |
}[high] | |
h /= 6 | |
return h, s, v | |
def hsl_to_rgb(h, s, l): | |
def hue_to_rgb(p, q, t): | |
t += 1 if t < 0 else 0 | |
t -= 1 if t > 1 else 0 | |
if t < 1/6: return p + (q - p) * 6 * t | |
if t < 1/2: return q | |
if t < 2/3: p + (q - p) * (2/3 - t) * 6 | |
return p | |
if s == 0: | |
r, g, b = l, l, l | |
else: | |
q = l * (1 + s) if l < 0.5 else l + s - l * s | |
p = 2 * l - q | |
r = hue_to_rgb(p, q, h + 1/3) | |
g = hue_to_rgb(p, q, h) | |
b = hue_to_rgb(p, q, h - 1/3) | |
return r, g, b | |
def hsv_to_hsl(h, s, v): | |
l = 0.5 * v * (2 - s) | |
s = v * s / (1 - math.fabs(2*l-1)) | |
return h, s, l | |
def hsl_to_hsv(h, s, l): | |
v = (2*l + s*(1-math.fabs(2*l-1)))/2 | |
s = 2*(v-l)/v | |
return h, s, v |
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