def test_nan_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition nan support.
"""
oetf_reverse_BT601(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))
def test_nan_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition nan support.
"""
oetf_reverse_BT601(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))
def test_domain_range_scale_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition domain and range scale support.
"""
E = 0.409007728864150
L = oetf_reverse_BT601(E)
d_r = (('reference', 1), (1, 1), (100, 100))
for scale, factor in d_r:
with domain_range_scale(scale):
np.testing.assert_almost_equal(
oetf_reverse_BT601(E * factor), L * factor, decimal=7)
def test_domain_range_scale_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition domain and range scale support.
"""
E = 0.409007728864150
L = oetf_reverse_BT601(E)
d_r = (('reference', 1), (1, 1), (100, 100))
for scale, factor in d_r:
with domain_range_scale(scale):
np.testing.assert_almost_equal(
oetf_reverse_BT601(E * factor), L * factor, decimal=7)
def test_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition.
"""
self.assertAlmostEqual(oetf_reverse_BT601(0.0), 0.0, places=7)
self.assertAlmostEqual(
oetf_reverse_BT601(0.067500000000000), 0.015, places=7)
self.assertAlmostEqual(
oetf_reverse_BT601(0.409007728864150), 0.18, places=7)
self.assertAlmostEqual(oetf_reverse_BT601(1.0), 1.0, places=7)
def test_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition.
"""
self.assertAlmostEqual(oetf_reverse_BT601(0.0), 0.0, places=7)
self.assertAlmostEqual(
oetf_reverse_BT601(0.067500000000000), 0.015, places=7)
self.assertAlmostEqual(
oetf_reverse_BT601(0.409007728864150), 0.18, places=7)
self.assertAlmostEqual(oetf_reverse_BT601(1.0), 1.0, places=7)
def oetf_reverse_BT709(V):
"""
Defines *Recommendation ITU-R BT.709-6* reverse opto-electronic transfer
function (OETF / OECF).
Parameters
----------
V : numeric or array_like
Electrical signal :math:`V`.
Returns
-------
numeric or ndarray
Corresponding *luminance* :math:`L` of the image.
References
----------
- :cite:`InternationalTelecommunicationUnion2015i`
Examples
--------
>>> oetf_reverse_BT709(0.409007728864150) # doctest: +ELLIPSIS
0.1...
"""
return oetf_reverse_BT601(V)
def test_n_dimensional_oetf_reverse_BT601(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_601.\
oetf_reverse_BT601` definition n-dimensional arrays support.
"""
E = 0.409007728864150
L = oetf_reverse_BT601(E)
E = np.tile(E, 6)
L = np.tile(L, 6)
np.testing.assert_almost_equal(oetf_reverse_BT601(E), L, decimal=7)
E = np.reshape(E, (2, 3))
L = np.reshape(L, (2, 3))
np.testing.assert_almost_equal(oetf_reverse_BT601(E), L, decimal=7)
E = np.reshape(E, (2, 3, 1))
L = np.reshape(L, (2, 3, 1))
np.testing.assert_almost_equal(oetf_reverse_BT601(E), L, decimal=7)
def oetf_reverse_BT709(V):
"""
Defines *Recommendation ITU-R BT.709-6* reverse opto-electronic transfer
function (OETF / OECF).
Parameters
----------
V : numeric or array_like
Electrical signal :math:`V`.
Returns
-------
numeric or ndarray
Corresponding *luminance* :math:`L` of the image.
Notes
-----
+------------+-----------------------+---------------+
| **Domain** | **Scale - Reference** | **Scale - 1** |
+============+=======================+===============+
| ``V`` | [0, 1] | [0, 1] |
+------------+-----------------------+---------------+
+------------+-----------------------+---------------+
| **Range** | **Scale - Reference** | **Scale - 1** |
+============+=======================+===============+
| ``L`` | [0, 1] | [0, 1] |
+------------+-----------------------+---------------+
References
----------
:cite:`InternationalTelecommunicationUnion2015i`
Examples
--------
>>> oetf_reverse_BT709(0.409007728864150) # doctest: +ELLIPSIS
0.1...
"""
return oetf_reverse_BT601(V)
