Coverage for models/rgb/datasets/eci_rgb_v2.py: 7%

1""" 

2ECI RGB v2 Colourspace 

3====================== 

4 

5Define the *ECI RGB v2* colourspace: 

6 

7- :attr:`colour.models.RGB_COLOURSPACE_ECI_RGB_V2`. 

8 

9References 

10---------- 

11- :cite:`EuropeanColorInitiative2002a` : European Color Initiative. (2002). 

12 ECI RGB v2. 

13 http://www.eci.org/_media/downloads/icc_profiles_from_eci/ecirgbv20.zip 

14""" 

15 

16from __future__ import annotations 

17 

18import typing 

19from functools import partial 

20 

21import numpy as np 

22 

23from colour.colorimetry import CCS_ILLUMINANTS, lightness_CIE1976, luminance_CIE1976 

24 

25if typing.TYPE_CHECKING: 

26 from colour.hints import ( 

27 ArrayLike, 

28 Callable, 

29 NDArrayFloat, 

30 ) 

31 

32from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix 

33from colour.utilities import as_float_array 

34 

35__author__ = "Colour Developers" 

36__copyright__ = "Copyright 2013 Colour Developers" 

37__license__ = "BSD-3-Clause - https://opensource.org/licenses/BSD-3-Clause" 

38__maintainer__ = "Colour Developers" 

39__email__ = "colour-developers@colour-science.org" 

40__status__ = "Production" 

41 

42__all__ = [ 

43 "PRIMARIES_ECI_RGB_V2", 

44 "WHITEPOINT_NAME_ECI_RGB_V", 

45 "CCS_WHITEPOINT_ECI_RGB_V2", 

46 "MATRIX_ECI_RGB_V2_TO_XYZ", 

47 "MATRIX_XYZ_TO_ECI_RGB_V2", 

48 "RGB_COLOURSPACE_ECI_RGB_V2", 

49] 

50 

51PRIMARIES_ECI_RGB_V2: NDArrayFloat = np.array( 

52 [ 

53 [0.670103092783505, 0.329896907216495], 

54 [0.209905660377358, 0.709905660377358], 

55 [0.140061791967044, 0.080329557157570], 

56 ] 

57) 

58"""*ECI RGB v2* colourspace primaries.""" 

59 

60WHITEPOINT_NAME_ECI_RGB_V: str = "D50" 

61"""*ECI RGB v2* colourspace whitepoint name.""" 

62 

63CCS_WHITEPOINT_ECI_RGB_V2: NDArrayFloat = CCS_ILLUMINANTS[ 

64 "CIE 1931 2 Degree Standard Observer" 

65][WHITEPOINT_NAME_ECI_RGB_V] 

66"""*ECI RGB v2* colourspace whitepoint chromaticity coordinates.""" 

67 

68MATRIX_ECI_RGB_V2_TO_XYZ: NDArrayFloat = normalised_primary_matrix( 

69 PRIMARIES_ECI_RGB_V2, CCS_WHITEPOINT_ECI_RGB_V2 

70) 

71"""*ECI RGB v2* colourspace to *CIE XYZ* tristimulus values matrix.""" 

72 

73MATRIX_XYZ_TO_ECI_RGB_V2: NDArrayFloat = np.linalg.inv(MATRIX_ECI_RGB_V2_TO_XYZ) 

74"""*CIE XYZ* tristimulus values to *ECI RGB v2* colourspace matrix.""" 

75 

76 

77def _scale_domain_0_100_range_0_1(a: ArrayLike, callable_: Callable) -> NDArrayFloat: 

78 """ 

79 Scale the input domain of the specified *luminance* :math:`Y` or *Lightness* 

80 :math:`L^*` array to [0, 100], call the specified callable, and 

81 scales the output range to [0, 1]. 

82 

83 Parameters 

84 ---------- 

85 a 

86 *Luminance* :math:`Y` or *Lightness* :math:`L^*` array. 

87 callable_ 

88 *Luminance* :math:`Y` or *Lightness* :math:`L^*` computation 

89 definition, i.e., :func:`colour.colorimetry.lightness_CIE1976` or 

90 :func:`colour.colorimetry.luminance_CIE1976`. Reference white 

91 *luminance* :math:`Y_n` has implicit value of :math:`100\\ cd/m^2`. 

92 

93 Returns 

94 ------- 

95 :class:`numpy.ndarray` 

96 Scaled *luminance* :math:`Y` or *Lightness* :math:`L^*` array. 

97 """ 

98 

99 a = as_float_array(a) 

100 

101 return callable_(a * 100, Y_n=100) / 100 

102 

103 

104RGB_COLOURSPACE_ECI_RGB_V2: RGB_Colourspace = RGB_Colourspace( 

105 "ECI RGB v2", 

106 PRIMARIES_ECI_RGB_V2, 

107 CCS_WHITEPOINT_ECI_RGB_V2, 

108 WHITEPOINT_NAME_ECI_RGB_V, 

109 MATRIX_ECI_RGB_V2_TO_XYZ, 

110 MATRIX_XYZ_TO_ECI_RGB_V2, 

111 partial(_scale_domain_0_100_range_0_1, callable_=lightness_CIE1976), 

112 partial(_scale_domain_0_100_range_0_1, callable_=luminance_CIE1976), 

113) 

114RGB_COLOURSPACE_ECI_RGB_V2.__doc__ = """ 

115*ECI RGB v2* colourspace. 

116 

117References 

118---------- 

119:cite:`EuropeanColorInitiative2002a` 

120"""