Update colour.matrix_RGB_to_RGB and colour.RGB_to_RGB definition signatures.

Author: KelSolaar

colour/models/rgb/rgb_colourspace.py

@@ -1238,8 +1238,8 @@ def RGB_to_XYZ(
 
 
 def matrix_RGB_to_RGB(
-    input_colourspace: RGB_Colourspace,
-    output_colourspace: RGB_Colourspace,
+    input_colourspace: RGB_Colourspace | str,
+    output_colourspace: RGB_Colourspace | str,
     chromatic_adaptation_transform: Literal[
         "Bianco 2010",
         "Bianco PC 2010",
@@ -1285,11 +1285,38 @@ def matrix_RGB_to_RGB(
     ... )
     >>> matrix_RGB_to_RGB(RGB_COLOURSPACE_sRGB, RGB_COLOURSPACE_PROPHOTO_RGB)
     ... # doctest: +ELLIPSIS
+    array([[ 0.5288241...,  0.3340609...,  0.1373616...],
+           [ 0.0975294...,  0.8790074...,  0.0233981...],
+           [ 0.0163599...,  0.1066124...,  0.8772485...]])
+    >>> matrix_RGB_to_RGB("sRGB", "ProPhoto RGB")
+    ... # doctest: +ELLIPSIS
     array([[ 0.5288241...,  0.3340609...,  0.1373616...],
            [ 0.0975294...,  0.8790074...,  0.0233981...],
            [ 0.0163599...,  0.1066124...,  0.8772485...]])
     """
 
+    from colour.models import RGB_COLOURSPACES
+
+    if isinstance(input_colourspace, str):
+        input_colourspace = validate_method(
+            input_colourspace,
+            RGB_COLOURSPACES,
+            '"{0}" "RGB" colourspace is invalid, it must be one of {1}!',
+        )
+        input_colourspace = cast(
+            RGB_Colourspace, RGB_COLOURSPACES[input_colourspace]
+        )
+
+    if isinstance(output_colourspace, str):
+        output_colourspace = validate_method(
+            output_colourspace,
+            RGB_COLOURSPACES,
+            '"{0}" "RGB" colourspace is invalid, it must be one of {1}!',
+        )
+        output_colourspace = cast(
+            RGB_Colourspace, RGB_COLOURSPACES[output_colourspace]
+        )
+
     M = input_colourspace.matrix_RGB_to_XYZ
 
     if chromatic_adaptation_transform is not None:
@@ -1308,8 +1335,8 @@ def matrix_RGB_to_RGB(
 
 def RGB_to_RGB(
     RGB: ArrayLike,
-    input_colourspace: RGB_Colourspace,
-    output_colourspace: RGB_Colourspace,
+    input_colourspace: RGB_Colourspace | str,
+    output_colourspace: RGB_Colourspace | str,
     chromatic_adaptation_transform: Literal[
         "Bianco 2010",
         "Bianco PC 2010",
@@ -1386,8 +1413,33 @@ def RGB_to_RGB(
     >>> RGB_to_RGB(RGB, RGB_COLOURSPACE_sRGB, RGB_COLOURSPACE_PROPHOTO_RGB)
     ... # doctest: +ELLIPSIS
     array([ 0.2568891...,  0.0721446...,  0.0465553...])
+    >>> RGB_to_RGB(RGB, "sRGB", "ProPhoto RGB")
+    ... # doctest: +ELLIPSIS
+    array([ 0.2568891...,  0.0721446...,  0.0465553...])
     """
 
+    from colour.models import RGB_COLOURSPACES
+
+    if isinstance(input_colourspace, str):
+        input_colourspace = validate_method(
+            input_colourspace,
+            RGB_COLOURSPACES,
+            '"{0}" "RGB" colourspace is invalid, it must be one of {1}!',
+        )
+        input_colourspace = cast(
+            RGB_Colourspace, RGB_COLOURSPACES[input_colourspace]
+        )
+
+    if isinstance(output_colourspace, str):
+        output_colourspace = validate_method(
+            output_colourspace,
+            RGB_COLOURSPACES,
+            '"{0}" "RGB" colourspace is invalid, it must be one of {1}!',
+        )
+        output_colourspace = cast(
+            RGB_Colourspace, RGB_COLOURSPACES[output_colourspace]
+        )
+
     RGB = to_domain_1(RGB)
 
     if apply_cctf_decoding and input_colourspace.cctf_decoding is not None:

colour/models/rgb/tests/test_rgb_colourspace.py

@@ -761,6 +761,12 @@ def test_matrix_RGB_to_RGB(self):
             decimal=7,
         )
 
+        np.testing.assert_array_almost_equal(
+            matrix_RGB_to_RGB(aces_2065_1_colourspace, sRGB_colourspace),
+            matrix_RGB_to_RGB("ACES2065-1", "sRGB"),
+            decimal=7,
+        )
+
 
 class TestRGB_to_RGB(unittest.TestCase):
     """
@@ -854,6 +860,20 @@ def test_RGB_to_RGB(self):
             np.array([120, 59, 46]),
         )
 
+        np.testing.assert_array_almost_equal(
+            RGB_to_RGB(
+                np.array([0.21931722, 0.06950287, 0.04694832]),
+                aces_2065_1_colourspace,
+                sRGB_colourspace,
+            ),
+            RGB_to_RGB(
+                np.array([0.21931722, 0.06950287, 0.04694832]),
+                "ACES2065-1",
+                "sRGB",
+            ),
+            decimal=7,
+        )
+
     def test_n_dimensional_RGB_to_RGB(self):
         """
         Test :func:`colour.models.rgb.rgb_colourspace.RGB_to_RGB` definition