Uniquely define common gamma functions using partial.

README.rst

@@ -1495,9 +1495,12 @@ CCTFs Encoding / Decoding
      'F-Log',
      'F-Log2',
      'Filmic Pro 6',
+     'Gamma 1.8',
+     'Gamma 2.199',
      'Gamma 2.2',
      'Gamma 2.4',
      'Gamma 2.6',
+     'Gamma 2.8',
      'ITU-R BT.1886',
      'ITU-R BT.2020',
      'ITU-R BT.2100 HLG',

colour/models/rgb/datasets/adobe_rgb_1998.py

@@ -14,13 +14,15 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import RGB_Colourspace, gamma_function
+from colour.models.rgb import RGB_Colourspace
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_199,
+    encoding_gamma_function_2_199,
+)
 
 __author__ = "Colour Developers"
 __copyright__ = "Copyright 2013 Colour Developers"
@@ -80,8 +82,8 @@
     WHITEPOINT_NAME_ADOBE_RGB1998,
     MATRIX_ADOBE_RGB1998_TO_XYZ,
     MATRIX_XYZ_TO_ADOBE_RGB1998,
-    partial(gamma_function, exponent=1 / (563 / 256)),
-    partial(gamma_function, exponent=563 / 256),
+    encoding_gamma_function_2_199,
+    decoding_gamma_function_2_199,
 )
 RGB_COLOURSPACE_ADOBE_RGB1998.__doc__ = """
 *Adobe RGB (1998)* colourspace.

colour/models/rgb/datasets/adobe_wide_gamut_rgb.py

@@ -15,16 +15,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_199,
+    encoding_gamma_function_2_199,
 )
 
 __author__ = "Colour Developers"
@@ -77,8 +75,8 @@
     WHITEPOINT_NAME_ADOBE_WIDE_GAMUT_RGB,
     MATRIX_ADOBE_WIDE_GAMUT_RGB_TO_XYZ,
     MATRIX_XYZ_TO_ADOBE_WIDE_GAMUT_RGB,
-    partial(gamma_function, exponent=1 / (563 / 256)),
-    partial(gamma_function, exponent=563 / 256),
+    encoding_gamma_function_2_199,
+    decoding_gamma_function_2_199,
 )
 RGB_COLOURSPACE_ADOBE_WIDE_GAMUT_RGB.__doc__ = """
 *Adobe Wide Gamut RGB* colourspace.

colour/models/rgb/datasets/apple_rgb.py

@@ -14,17 +14,18 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
 from colour.models.rgb import (
     RGB_Colourspace,
-    gamma_function,
     normalised_primary_matrix,
 )
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_1_8,
+    encoding_gamma_function_1_8,
+)
 
 __author__ = "Colour Developers"
 __copyright__ = "Copyright 2013 Colour Developers"
@@ -74,8 +75,8 @@
     WHITEPOINT_NAME_APPLE_RGB,
     MATRIX_APPLE_RGB_TO_XYZ,
     MATRIX_XYZ_TO_APPLE_RGB,
-    partial(gamma_function, exponent=1 / 1.8),
-    partial(gamma_function, exponent=1.8),
+    encoding_gamma_function_1_8,
+    decoding_gamma_function_1_8,
 )
 RGB_COLOURSPACE_APPLE_RGB.__doc__ = """
 *Apple RGB* colourspace.

colour/models/rgb/datasets/best_rgb.py

@@ -14,16 +14,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_2,
+    encoding_gamma_function_2_2,
 )
 
 __author__ = "Colour Developers"
@@ -74,8 +72,8 @@
     WHITEPOINT_NAME_BEST_RGB,
     MATRIX_BEST_RGB_TO_XYZ,
     MATRIX_XYZ_TO_BEST_RGB,
-    partial(gamma_function, exponent=1 / 2.2),
-    partial(gamma_function, exponent=2.2),
+    encoding_gamma_function_2_2,
+    decoding_gamma_function_2_2,
 )
 RGB_COLOURSPACE_BEST_RGB.__doc__ = """
 *Best RGB* colourspace.

colour/models/rgb/datasets/beta_rgb.py

@@ -15,16 +15,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_2,
+    encoding_gamma_function_2_2,
 )
 
 __author__ = "Colour Developers"
@@ -75,8 +73,8 @@
     WHITEPOINT_NAME_BETA_RGB,
     MATRIX_BETA_RGB_TO_XYZ,
     MATRIX_XYZ_TO_BETA_RGB,
-    partial(gamma_function, exponent=1 / 2.2),
-    partial(gamma_function, exponent=2.2),
+    encoding_gamma_function_2_2,
+    decoding_gamma_function_2_2,
 )
 RGB_COLOURSPACE_BETA_RGB.__doc__ = """
 *Beta RGB* colourspace.

colour/models/rgb/datasets/cie_rgb.py

@@ -16,13 +16,15 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import RGB_Colourspace, gamma_function
+from colour.models.rgb import RGB_Colourspace
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_2,
+    encoding_gamma_function_2_2,
+)
 
 __author__ = "Colour Developers"
 __copyright__ = "Copyright 2013 Colour Developers"
@@ -84,8 +86,8 @@
     WHITEPOINT_NAME_CIE_RGB,
     MATRIX_CIE_RGB_TO_XYZ,
     MATRIX_XYZ_TO_CIE_RGB,
-    partial(gamma_function, exponent=1 / 2.2),
-    partial(gamma_function, exponent=2.2),
+    encoding_gamma_function_2_2,
+    decoding_gamma_function_2_2,
 )
 RGB_COLOURSPACE_CIE_RGB.__doc__ = """
 *CIE RGB* colourspace.

colour/models/rgb/datasets/color_match_rgb.py

@@ -15,16 +15,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_1_8,
+    encoding_gamma_function_1_8,
 )
 
 __author__ = "Colour Developers"
@@ -77,8 +75,8 @@
     WHITEPOINT_NAME_COLOR_MATCH_RGB,
     MATRIX_COLOR_MATCH_RGB_TO_XYZ,
     MATRIX_XYZ_TO_COLOR_MATCH_RGB,
-    partial(gamma_function, exponent=1 / 1.8),
-    partial(gamma_function, exponent=1.8),
+    encoding_gamma_function_1_8,
+    decoding_gamma_function_1_8,
 )
 RGB_COLOURSPACE_COLOR_MATCH_RGB.__doc__ = """
 *ColorMatch RGB* colourspace.

colour/models/rgb/datasets/dci_p3.py

@@ -26,16 +26,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_6,
+    encoding_gamma_function_2_6,
 )
 
 __author__ = "Colour Developers"
@@ -115,8 +113,8 @@
     WHITEPOINT_NAME_DCI_P3,
     MATRIX_DCI_P3_TO_XYZ,
     MATRIX_XYZ_TO_DCI_P3,
-    partial(gamma_function, exponent=1 / 2.6),
-    partial(gamma_function, exponent=2.6),
+    encoding_gamma_function_2_6,
+    decoding_gamma_function_2_6,
 )
 RGB_COLOURSPACE_DCI_P3.__doc__ = """
 *DCI-P3* colourspace.
@@ -134,8 +132,8 @@
     WHITEPOINT_NAME_DCI_P3,
     MATRIX_DCI_P3_P_TO_XYZ,
     MATRIX_XYZ_TO_DCI_P3_P,
-    partial(gamma_function, exponent=1 / 2.6),
-    partial(gamma_function, exponent=2.6),
+    encoding_gamma_function_2_6,
+    decoding_gamma_function_2_6,
 )
 RGB_COLOURSPACE_DCI_P3_P.__doc__ = """
 *DCI-P3+* colourspace.

colour/models/rgb/datasets/don_rgb_4.py

@@ -14,16 +14,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_2,
+    encoding_gamma_function_2_2,
 )
 
 __author__ = "Colour Developers"
@@ -74,8 +72,8 @@
     WHITEPOINT_NAME_DON_RGB_4,
     MATRIX_DON_RGB_4_TO_XYZ,
     MATRIX_XYZ_TO_DON_RGB_4,
-    partial(gamma_function, exponent=1 / 2.2),
-    partial(gamma_function, exponent=2.2),
+    encoding_gamma_function_2_2,
+    decoding_gamma_function_2_2,
 )
 RGB_COLOURSPACE_DON_RGB_4.__doc__ = """
 *Don RGB 4* colourspace.

colour/models/rgb/datasets/ekta_space_ps5.py

@@ -14,16 +14,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_2,
+    encoding_gamma_function_2_2,
 )
 
 __author__ = "Colour Developers"
@@ -76,8 +74,8 @@
     WHITEPOINT_NAME_EKTA_SPACE_PS_5_V,
     MATRIX_EKTA_SPACE_PS_5_TO_XYZ,
     MATRIX_XYZ_TO_EKTA_SPACE_PS_5,
-    partial(gamma_function, exponent=1 / 2.2),
-    partial(gamma_function, exponent=2.2),
+    encoding_gamma_function_2_2,
+    decoding_gamma_function_2_2,
 )
 RGB_COLOURSPACE_EKTA_SPACE_PS_5.__doc__ = """
 *Ekta Space PS 5* colourspace.

colour/models/rgb/datasets/itur_bt_470.py

@@ -18,16 +18,14 @@
 
 from __future__ import annotations
 
-from functools import partial
-
 import numpy as np
 
 from colour.colorimetry import CCS_ILLUMINANTS
 from colour.hints import NDArrayFloat
-from colour.models.rgb import (
-    RGB_Colourspace,
-    gamma_function,
-    normalised_primary_matrix,
+from colour.models.rgb import RGB_Colourspace, normalised_primary_matrix
+from colour.models.rgb.transfer_functions.gamma import (
+    decoding_gamma_function_2_8,
+    encoding_gamma_function_2_8,
 )
 
 __author__ = "Colour Developers"
@@ -93,8 +91,8 @@
     WHITEPOINT_NAME_BT470_525,
     MATRIX_BT470_525_TO_XYZ,
     MATRIX_XYZ_TO_BT470_525,
-    partial(gamma_function, exponent=1 / 2.8),
-    partial(gamma_function, exponent=2.8),
+    encoding_gamma_function_2_8,
+    decoding_gamma_function_2_8,
 )
 RGB_COLOURSPACE_BT470_525.__doc__ = """
 *Recommendation ITU-R BT.470 - 525* colourspace.
@@ -145,8 +143,8 @@
     WHITEPOINT_NAME_BT470_625,
     MATRIX_BT470_625_TO_XYZ,
     MATRIX_XYZ_TO_BT470_625,
-    partial(gamma_function, exponent=1 / 2.8),
-    partial(gamma_function, exponent=2.8),
+    encoding_gamma_function_2_8,
+    decoding_gamma_function_2_8,
 )
 RGB_COLOURSPACE_BT470_625.__doc__ = """
 *Recommendation ITU-R BT.470 - 625* colourspace.