def test_n_dimensional_RGB_to_YCbCr(self):
"""
Tests :func:`colour.models.rgb.ycbcr.RGB_to_YCbCr` definition
n-dimensional arrays support.
"""
RGB = np.array([0.75, 0.5, 0.25])
YCbCr = RGB_to_YCbCr(RGB)
RGB = np.tile(RGB, 4)
RGB = np.reshape(RGB, (4, 3))
YCbCr = np.tile(YCbCr, 4)
YCbCr = np.reshape(YCbCr, (4, 3))
np.testing.assert_almost_equal(RGB_to_YCbCr(RGB), YCbCr)
RGB = np.tile(RGB, 4)
RGB = np.reshape(RGB, (4, 4, 3))
YCbCr = np.tile(YCbCr, 4)
YCbCr = np.reshape(YCbCr, (4, 4, 3))
np.testing.assert_almost_equal(RGB_to_YCbCr(RGB), YCbCr)
RGB = np.tile(RGB, 4)
RGB = np.reshape(RGB, (4, 4, 4, 3))
YCbCr = np.tile(YCbCr, 4)
YCbCr = np.reshape(YCbCr, (4, 4, 4, 3))
np.testing.assert_almost_equal(RGB_to_YCbCr(RGB), YCbCr)
def test_RGB_to_YCbCr(self):
"""
Tests :func:`colour.models.rgb.ycbcr.RGB_to_YCbCr` definition.
"""
np.testing.assert_almost_equal(
RGB_to_YCbCr(np.array([0.75, 0.75, 0.0])),
np.array([0.66035745, 0.17254902, 0.53216593]),
decimal=7)
np.testing.assert_almost_equal(RGB_to_YCbCr(
np.array([0.25, 0.5, 0.75]),
K=WEIGHTS_YCBCR['ITU-R BT.601'],
out_int=True,
out_legal=True,
out_bits=10),
np.array([461, 662, 382]),
decimal=7)
np.testing.assert_almost_equal(
RGB_to_YCbCr(np.array([0.0, 0.75, 0.75]),
K=WEIGHTS_YCBCR['ITU-R BT.2020'],
out_int=False,
out_legal=False),
np.array([0.55297500, 0.10472255, -0.37500000]),
decimal=7)
np.testing.assert_almost_equal(
RGB_to_YCbCr(np.array([0.75, 0.0, 0.75]),
K=WEIGHTS_YCBCR['ITU-R BT.709'],
out_range=(16 / 255, 235 / 255, 15.5 / 255,
239.5 / 255)),
np.array([0.24618980, 0.75392897, 0.79920662]),
decimal=7)
def test_domain_range_scale_RGB_to_YCbCr(self):
"""
Tests :func:`colour.models.rgb.prismatic.RGB_to_YCbCr` definition
domain and range scale support.
"""
RGB = np.array([0.75, 0.5, 0.25])
YCbCr = RGB_to_YCbCr(RGB)
d_r = (('reference', 1), (1, 1), (100, 100))
for scale, factor in d_r:
with domain_range_scale(scale):
np.testing.assert_almost_equal(
RGB_to_YCbCr(RGB * factor), YCbCr * factor, decimal=7)
def test_nan_RGB_to_YCbCr(self):
"""
Tests :func:`colour.models.rgb.ycbcr.RGB_to_YCbCr` definition nan
support.
"""
cases = [-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]
cases = set(permutations(cases * 3, r=3))
for case in cases:
RGB = np.array(case)
RGB_to_YCbCr(RGB)