release notes

autodocs
fix docstring
note for `Image.split`

PIL/Image.py

@@ -1947,6 +1947,9 @@ class Image(object):
         containing a copy of one of the original bands (red, green,
         blue).
 
+        If you need only one band, :py:meth:`~PIL.Image.Image.getchannel`
+        method can be more convinient and faster.
+
         :returns: A tuple containing bands.
         """
 
@@ -1967,6 +1970,8 @@ class Image(object):
           (0 for "R" channel of "RGB") or channel name
           ("A" for alpha channel of "RGBA").
         :returns: An image in "L" mode.
+
+        .. versionadded:: 4.3.0
         """
         self.load()
 

docs/reference/Image.rst

@@ -146,6 +146,7 @@ ITU-R 709, using the D65 luminant) to the CIE XYZ color space:
 .. automethod:: PIL.Image.Image.seek
 .. automethod:: PIL.Image.Image.show
 .. automethod:: PIL.Image.Image.split
+.. automethod:: PIL.Image.Image.getchannel
 .. automethod:: PIL.Image.Image.tell
 .. automethod:: PIL.Image.Image.thumbnail
 .. automethod:: PIL.Image.Image.tobitmap

docs/releasenotes/4.3.0.rst

@@ -0,0 +1,9 @@
+4.3.0
+-----
+
+Get One Channel From Image
+============================
+
+New method :py:meth:`PIL.Image.Image.getchannel` added.
+It returns single channel by index or name. For example,
+``image.getchannel("A")`` will return alpha channel as seperate image.

docs/releasenotes/index.rst

@@ -6,6 +6,7 @@ Release Notes
 .. toctree::
   :maxdepth: 2
 
+  4.3.0
   4.2.1
   4.2.0
   4.1.1
@@ -21,5 +22,3 @@ Release Notes
   3.0.0
   2.8.0
   2.7.0
-
-