Coverage for colour/models/rgb/transfer_functions/tests/test__init__.py: 100%

1""" 

2Define the unit tests for the 

3:mod:`colour.models.rgb.transfer_functions.common` module. 

4""" 

5 

6import numpy as np 

7import pytest 

8 

9from colour.constants import TOLERANCE_ABSOLUTE_TESTS 

10from colour.models.rgb.transfer_functions import ( 

11 CCTF_DECODINGS, 

12 CCTF_ENCODINGS, 

13 EOTF_INVERSES, 

14 EOTFS, 

15 LOG_DECODINGS, 

16 LOG_ENCODINGS, 

17 OETF_INVERSES, 

18 OETFS, 

19 OOTF_INVERSES, 

20 OOTFS, 

21 cctf_decoding, 

22 cctf_encoding, 

23) 

24from colour.utilities import ColourUsageWarning 

25 

26__author__ = "Colour Developers" 

27__copyright__ = "Copyright 2013 Colour Developers" 

28__license__ = "BSD-3-Clause - https://opensource.org/licenses/BSD-3-Clause" 

29__maintainer__ = "Colour Developers" 

30__email__ = "colour-developers@colour-science.org" 

31__status__ = "Development" 

32 

33__all__ = [ 

34 "TestCctfEncoding", 

35 "TestCctfDecoding", 

36 "TestTransferFunctions", 

37] 

38 

39 

40class TestCctfEncoding: 

41 """ 

42 Define :func:`colour.models.rgb.transfer_functions.cctf_encoding` 

43 definition unit tests methods. 

44 """ 

45 

46 def test_raise_exception_cctf_encoding(self) -> None: 

47 """ 

48 Test :func:`colour.models.rgb.transfer_functions.aces.\ 

49log_encoding_ACESproxy` definition raised exception. 

50 """ 

51 

52 pytest.warns( 

53 ColourUsageWarning, 

54 cctf_encoding, 

55 0.18, 

56 function="ITU-R BT.2100 HLG", 

57 ) 

58 pytest.warns( 

59 ColourUsageWarning, 

60 cctf_encoding, 

61 0.18, 

62 function="ITU-R BT.2100 PQ", 

63 ) 

64 

65 

66class TestCctfDecoding: 

67 """ 

68 Define :func:`colour.models.rgb.transfer_functions.cctf_decoding` 

69 definition unit tests methods. 

70 """ 

71 

72 def test_raise_exception_cctf_decoding(self) -> None: 

73 """ 

74 Test :func:`colour.models.rgb.transfer_functions.aces.\ 

75log_encoding_ACESproxy` definition raised exception. 

76 """ 

77 

78 pytest.warns( 

79 ColourUsageWarning, 

80 cctf_decoding, 

81 0.18, 

82 function="ITU-R BT.2100 HLG", 

83 ) 

84 pytest.warns( 

85 ColourUsageWarning, 

86 cctf_decoding, 

87 0.18, 

88 function="ITU-R BT.2100 PQ", 

89 ) 

90 

91 

92class TestTransferFunctions: 

93 """Define the transfer functions unit tests methods.""" 

94 

95 def test_transfer_functions(self) -> None: 

96 """Test the transfer functions reciprocity.""" 

97 

98 ignored_transfer_functions = ( 

99 "ACESproxy", 

100 "DICOM GSDF", 

101 "Filmic Pro 6", 

102 ) 

103 

104 tolerance = {"D-Log": 0.1, "F-Log": 5e-4, "L-Log": 5e-4, "N-Log": 5e-3} 

105 

106 reciprocal_mappings = [ 

107 (LOG_ENCODINGS, LOG_DECODINGS), 

108 (OETFS, OETF_INVERSES), 

109 (EOTFS, EOTF_INVERSES), 

110 (CCTF_ENCODINGS, CCTF_DECODINGS), 

111 (OOTFS, OOTF_INVERSES), 

112 ] 

113 

114 samples = np.hstack( 

115 [np.linspace(0, 1, int(1e5)), np.linspace(0, 65504, 65504 * 10)] 

116 ) 

117 

118 for encoding_mapping, _decoding_mapping in reciprocal_mappings: 

119 for name in encoding_mapping: 

120 if name in ignored_transfer_functions: 

121 continue 

122 

123 samples_r = np.copy(samples) 

124 

125 if name == "ITU-T H.273 Log": 

126 samples_r = np.clip(samples_r, 0.1, np.inf) 

127 

128 if name == "ITU-T H.273 Log Sqrt": 

129 samples_r = np.clip(samples_r, np.sqrt(10) / 1000, np.inf) 

130 

131 samples_e = CCTF_ENCODINGS[name](samples_r) 

132 samples_d = CCTF_DECODINGS[name](samples_e) 

133 

134 np.testing.assert_allclose( 

135 samples_r, 

136 samples_d, 

137 atol=tolerance.get(name, TOLERANCE_ABSOLUTE_TESTS), 

138 )