def test_nan_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976`
definition nan support.
"""
lightness_1976(np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))
def test_n_dimensional_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976`
definition n-dimensional arrays support.
"""
Y = 10.08
Lstar = 37.98562909765304
np.testing.assert_almost_equal(
lightness_1976(Y),
Lstar,
decimal=7)
Y = np.tile(Y, 6)
Lstar = np.tile(Lstar, 6)
np.testing.assert_almost_equal(
lightness_1976(Y),
Lstar,
decimal=7)
Y = np.reshape(Y, (2, 3))
Lstar = np.reshape(Lstar, (2, 3))
np.testing.assert_almost_equal(
lightness_1976(Y),
Lstar,
decimal=7)
Y = np.reshape(Y, (2, 3, 1))
Lstar = np.reshape(Lstar, (2, 3, 1))
np.testing.assert_almost_equal(
lightness_1976(Y),
Lstar,
decimal=7)
def test_nan_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976`
definition nan support.
"""
lightness_1976(
np.array([-1.0, 0.0, 1.0, -np.inf, np.inf, np.nan]))
def test_n_dimensional_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976`
definition n-dimensional arrays support.
"""
Y = 10.08
Lstar = 37.98562909765304
np.testing.assert_almost_equal(lightness_1976(Y), Lstar, decimal=7)
Y = np.tile(Y, 6)
Lstar = np.tile(Lstar, 6)
np.testing.assert_almost_equal(lightness_1976(Y), Lstar, decimal=7)
Y = np.reshape(Y, (2, 3))
Lstar = np.reshape(Lstar, (2, 3))
np.testing.assert_almost_equal(lightness_1976(Y), Lstar, decimal=7)
Y = np.reshape(Y, (2, 3, 1))
Lstar = np.reshape(Lstar, (2, 3, 1))
np.testing.assert_almost_equal(lightness_1976(Y), Lstar, decimal=7)
def test_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976` definition.
"""
self.assertAlmostEqual(
lightness_1976(10.08),
37.9856290977,
places=7)
self.assertAlmostEqual(
lightness_1976(56.76),
80.0444155585,
places=7)
self.assertAlmostEqual(
lightness_1976(98.32),
99.3467279026,
places=7)
self.assertAlmostEqual(
lightness_1976(10.08, 50),
52.01763049195023,
places=7)
self.assertAlmostEqual(
lightness_1976(10.08, 75),
43.41887325541973,
places=7)
self.assertAlmostEqual(
lightness_1976(10.08, 95),
38.91659875709282,
places=7)
def _eci_rgb_v2_transfer_function(value):
"""
Defines the *ECI RGB v2* colourspace transfer function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
return lightness_1976(value * 100) / 100
def _eci_rgb_v2_OECF(value):
"""
Defines the *ECI RGB v2* colourspace opto-electronic conversion function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
return lightness_1976(value * 100) / 100
def _eci_rgb_v2_OECF(value):
"""
Defines the *ECI RGB v2* colourspace opto-electronic conversion function.
Parameters
----------
value : numeric or array_like
Value.
Returns
-------
numeric or ndarray
Companded value.
"""
return lightness_1976(value * 100) / 100
def test_lightness_1976(self):
"""
Tests :func:`colour.colorimetry.lightness.lightness_1976` definition.
"""
self.assertAlmostEqual(lightness_1976(10.08), 37.9856290977, places=7)
self.assertAlmostEqual(lightness_1976(56.76), 80.0444155585, places=7)
self.assertAlmostEqual(lightness_1976(98.32), 99.3467279026, places=7)
self.assertAlmostEqual(lightness_1976(10.08, 50),
52.01763049195023,
places=7)
self.assertAlmostEqual(lightness_1976(10.08, 75),
43.41887325541973,
places=7)
self.assertAlmostEqual(lightness_1976(10.08, 95),
38.91659875709282,
places=7)
ECI_RGB_V2_TO_XYZ_MATRIX = normalised_primary_matrix(ECI_RGB_V2_PRIMARIES, ECI_RGB_V2_WHITEPOINT)
"""
*ECI RGB v2* colourspace to *CIE XYZ* colourspace matrix.
ECI_RGB_V2_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_ECI_RGB_V2_MATRIX = np.linalg.inv(ECI_RGB_V2_TO_XYZ_MATRIX)
"""
*CIE XYZ* colourspace to *ECI RGB v2* colourspace matrix.
XYZ_TO_ECI_RGB_V2_MATRIX : array_like, (3, 3)
"""
ECI_RGB_V2_TRANSFER_FUNCTION = lambda x: lightness_1976(x * 100) / 100
"""
Transfer function from linear to *ECI RGB v2* colourspace.
ECI_RGB_V2_TRANSFER_FUNCTION : object
"""
ECI_RGB_V2_INVERSE_TRANSFER_FUNCTION = lambda x: (luminance_1976(x * 100) / 100)
"""
Inverse transfer function from *ECI RGB v2* colourspace to linear.
ECI_RGB_V2_INVERSE_TRANSFER_FUNCTION : object
"""
ECI_RGB_V2_COLOURSPACE = RGB_Colourspace(
"ECI RGB v2",
ECI_RGB_V2_TO_XYZ_MATRIX = normalised_primary_matrix(ECI_RGB_V2_PRIMARIES,
ECI_RGB_V2_WHITEPOINT)
"""
*ECI RGB v2* colourspace to *CIE XYZ* colourspace matrix.
ECI_RGB_V2_TO_XYZ_MATRIX : array_like, (3, 3)
"""
XYZ_TO_ECI_RGB_V2_MATRIX = np.linalg.inv(ECI_RGB_V2_TO_XYZ_MATRIX)
"""
*CIE XYZ* colourspace to *ECI RGB v2* colourspace matrix.
XYZ_TO_ECI_RGB_V2_MATRIX : array_like, (3, 3)
"""
ECI_RGB_V2_TRANSFER_FUNCTION = lambda x: lightness_1976(x * 100) / 100
"""
Transfer function from linear to *ECI RGB v2* colourspace.
ECI_RGB_V2_TRANSFER_FUNCTION : object
"""
ECI_RGB_V2_INVERSE_TRANSFER_FUNCTION = lambda x: (luminance_1976(x * 100) / 100
)
"""
Inverse transfer function from *ECI RGB v2* colourspace to linear.
ECI_RGB_V2_INVERSE_TRANSFER_FUNCTION : object
"""
ECI_RGB_V2_COLOURSPACE = RGB_Colourspace('ECI RGB v2', ECI_RGB_V2_PRIMARIES,
