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import unittest
import colorsys
def frange(start, stop, step):
while start <= stop:
yield start
start += step
class ColorsysTest(unittest.TestCase):
def assertTripleEqual(self, tr1, tr2):
self.assertEqual(len(tr1), 3)
self.assertEqual(len(tr2), 3)
self.assertAlmostEqual(tr1[0], tr2[0])
self.assertAlmostEqual(tr1[1], tr2[1])
self.assertAlmostEqual(tr1[2], tr2[2])
def test_hsv_roundtrip(self):
for r in frange(0.0, 1.0, 0.2):
for g in frange(0.0, 1.0, 0.2):
for b in frange(0.0, 1.0, 0.2):
rgb = (r, g, b)
self.assertTripleEqual(
rgb,
colorsys.hsv_to_rgb(*colorsys.rgb_to_hsv(*rgb))
)
def test_hsv_values(self):
values = [
# rgb, hsv
((0.0, 0.0, 0.0), ( 0 , 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (4./6., 1.0, 1.0)), # blue
((0.0, 1.0, 0.0), (2./6., 1.0, 1.0)), # green
((0.0, 1.0, 1.0), (3./6., 1.0, 1.0)), # cyan
((1.0, 0.0, 0.0), ( 0 , 1.0, 1.0)), # red
((1.0, 0.0, 1.0), (5./6., 1.0, 1.0)), # purple
((1.0, 1.0, 0.0), (1./6., 1.0, 1.0)), # yellow
((1.0, 1.0, 1.0), ( 0 , 0.0, 1.0)), # white
((0.5, 0.5, 0.5), ( 0 , 0.0, 0.5)), # grey
]
for (rgb, hsv) in values:
self.assertTripleEqual(hsv, colorsys.rgb_to_hsv(*rgb))
self.assertTripleEqual(rgb, colorsys.hsv_to_rgb(*hsv))
def test_hls_roundtrip(self):
for r in frange(0.0, 1.0, 0.2):
for g in frange(0.0, 1.0, 0.2):
for b in frange(0.0, 1.0, 0.2):
rgb = (r, g, b)
self.assertTripleEqual(
rgb,
colorsys.hls_to_rgb(*colorsys.rgb_to_hls(*rgb))
)
def test_hls_values(self):
values = [
# rgb, hls
((0.0, 0.0, 0.0), ( 0 , 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
((1.0, 0.0, 0.0), ( 0 , 0.5, 1.0)), # red
((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
((1.0, 1.0, 1.0), ( 0 , 1.0, 0.0)), # white
((0.5, 0.5, 0.5), ( 0 , 0.5, 0.0)), # grey
]
for (rgb, hls) in values:
self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls))
def test_yiq_roundtrip(self):
for r in frange(0.0, 1.0, 0.2):
for g in frange(0.0, 1.0, 0.2):
for b in frange(0.0, 1.0, 0.2):
rgb = (r, g, b)
self.assertTripleEqual(
rgb,
colorsys.yiq_to_rgb(*colorsys.rgb_to_yiq(*rgb))
)
def test_yiq_values(self):
values = [
# rgb, yiq
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.11, -0.3217, 0.3121)), # blue
((0.0, 1.0, 0.0), (0.59, -0.2773, -0.5251)), # green
((0.0, 1.0, 1.0), (0.7, -0.599, -0.213)), # cyan
((1.0, 0.0, 0.0), (0.3, 0.599, 0.213)), # red
((1.0, 0.0, 1.0), (0.41, 0.2773, 0.5251)), # purple
((1.0, 1.0, 0.0), (0.89, 0.3217, -0.3121)), # yellow
((1.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.0, 0.0)), # grey
]
for (rgb, yiq) in values:
self.assertTripleEqual(yiq, colorsys.rgb_to_yiq(*rgb))
self.assertTripleEqual(rgb, colorsys.yiq_to_rgb(*yiq))
if __name__ == "__main__":
unittest.main()