def test_nan_oetf_reverse_BT709(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_709.\
oetf_reverse_BT709` definition nan support.
"""
oetf_reverse_BT709(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))
def test_domain_range_scale_oetf_reverse_BT709(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_709.\
oetf_reverse_BT709` definition domain and range scale support.
"""
V = 0.409007728864150
L = oetf_reverse_BT709(V)
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_BT709(V * factor), L * factor, decimal=7)
def test_oetf_reverse_BT709(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_709.\
oetf_reverse_BT709` definition.
"""
self.assertAlmostEqual(oetf_reverse_BT709(0.0), 0.0, places=7)
self.assertAlmostEqual(
oetf_reverse_BT709(0.067500000000000), 0.015, places=7)
self.assertAlmostEqual(
oetf_reverse_BT709(0.409007728864150), 0.18, places=7)
self.assertAlmostEqual(oetf_reverse_BT709(1.0), 1.0, places=7)
def ootf_reverse_BT2100_PQ(F_D):
"""
Defines *Recommendation ITU-R BT.2100* *Reference PQ* reverse opto-optical
transfer function (OOTF / OOCF).
Parameters
----------
F_D : numeric or array_like
:math:`F_D` is the luminance of a displayed linear component
(:math:`R_D`, :math:`G_D`, :math:`B_D`; :math:`Y_D`; or :math:`I_D`).
Returns
-------
numeric or ndarray
:math:`E = {R_S, G_S, B_S; Y_S; or I_S}` is the signal determined by
scene light and scaled by camera exposure. The values :math:`E`,
:math:`R_S`, :math:`G_S`, :math:`B_S`, :math:`Y_S`, :math:`I_S` are in
the range [0, 1].
References
----------
- :cite:`Borer2017a`
- :cite:`InternationalTelecommunicationUnion2016a`
Examples
--------
>>> ootf_reverse_BT2100_PQ(779.988360834115840) # doctest: +ELLIPSIS
0.1000000...
"""
F_D = np.asarray(F_D)
return oetf_reverse_BT709(eotf_reverse_BT1886(F_D / 100)) / 59.5208
def test_n_dimensional_oetf_reverse_BT709(self):
"""
Tests :func:`colour.models.rgb.transfer_functions.itur_bt_709.\
oetf_reverse_BT709` definition n-dimensional arrays support.
"""
V = 0.409007728864150
L = oetf_reverse_BT709(V)
V = np.tile(V, 6)
L = np.tile(L, 6)
np.testing.assert_almost_equal(oetf_reverse_BT709(V), L, decimal=7)
V = np.reshape(V, (2, 3))
L = np.reshape(L, (2, 3))
np.testing.assert_almost_equal(oetf_reverse_BT709(V), L, decimal=7)
V = np.reshape(V, (2, 3, 1))
L = np.reshape(L, (2, 3, 1))
np.testing.assert_almost_equal(oetf_reverse_BT709(V), L, decimal=7)
def ootf_reverse_BT2100_PQ(F_D):
"""
Defines *Recommendation ITU-R BT.2100* *Reference PQ* reverse opto-optical
transfer function (OOTF / OOCF).
Parameters
----------
F_D : numeric or array_like
:math:`F_D` is the luminance of a displayed linear component
(:math:`R_D`, :math:`G_D`, :math:`B_D`; :math:`Y_D`; or :math:`I_D`).
Returns
-------
numeric or ndarray
:math:`E = {R_S, G_S, B_S; Y_S; or I_S}` is the signal determined by
scene light and scaled by camera exposure.
Notes
-----
+------------+-----------------------+---------------+
| **Domain** | **Scale - Reference** | **Scale - 1** |
+============+=======================+===============+
| ``F_D`` | [0, 1] | [0, 1] |
+------------+-----------------------+---------------+
+------------+-----------------------+---------------+
| **Range** | **Scale - Reference** | **Scale - 1** |
+============+=======================+===============+
| ``E`` | [0, 1] | [0, 1] |
+------------+-----------------------+---------------+
References
----------
:cite:`Borer2017a`, :cite:`InternationalTelecommunicationUnion2016a`
Examples
--------
>>> ootf_reverse_BT2100_PQ(779.988360834115840) # doctest: +ELLIPSIS
0.1000000...
"""
F_D = as_float_array(F_D)
return oetf_reverse_BT709(eotf_reverse_BT1886(F_D / 100)) / 59.5208
