Added ImageType as Image.Image TypeAlias

src/PIL/Image.py

@@ -40,6 +40,7 @@
 from collections.abc import Callable, MutableMapping
 from enum import IntEnum
 from pathlib import Path
+from typing import TypeAlias
 
 try:
     from defusedxml import ElementTree
@@ -60,6 +61,8 @@
 from ._binary import i32le, o32be, o32le
 from ._util import DeferredError, is_path
 
+ImageType: TypeAlias = Image.Image
+
 logger = logging.getLogger(__name__)
 
 

src/PIL/ImageChops.py

@@ -20,7 +20,7 @@
 from . import Image
 
 
-def constant(image: Image.Image, value: int) -> Image.Image:
+def constant(image: Image.ImageType, value: int) -> Image.ImageType:
     """Fill a channel with a given gray level.
 
     :rtype: :py:class:`~PIL.Image.Image`
@@ -29,7 +29,7 @@ def constant(image: Image.Image, value: int) -> Image.Image:
     return Image.new("L", image.size, value)
 
 
-def duplicate(image: Image.Image) -> Image.Image:
+def duplicate(image: Image.ImageType) -> Image.ImageType:
     """Copy a channel. Alias for :py:meth:`PIL.Image.Image.copy`.
 
     :rtype: :py:class:`~PIL.Image.Image`
@@ -38,7 +38,7 @@ def duplicate(image: Image.Image) -> Image.Image:
     return image.copy()
 
 
-def invert(image: Image.Image) -> Image.Image:
+def invert(image: Image.ImageType) -> Image.ImageType:
     """
     Invert an image (channel). ::
 
@@ -51,7 +51,7 @@ def invert(image: Image.Image) -> Image.Image:
     return image._new(image.im.chop_invert())
 
 
-def lighter(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def lighter(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Compares the two images, pixel by pixel, and returns a new image containing
     the lighter values. ::
@@ -66,7 +66,7 @@ def lighter(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_lighter(image2.im))
 
 
-def darker(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def darker(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Compares the two images, pixel by pixel, and returns a new image containing
     the darker values. ::
@@ -81,7 +81,7 @@ def darker(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_darker(image2.im))
 
 
-def difference(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def difference(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Returns the absolute value of the pixel-by-pixel difference between the two
     images. ::
@@ -96,7 +96,7 @@ def difference(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_difference(image2.im))
 
 
-def multiply(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def multiply(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Superimposes two images on top of each other.
 
@@ -113,7 +113,7 @@ def multiply(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_multiply(image2.im))
 
 
-def screen(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def screen(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Superimposes two inverted images on top of each other. ::
 
@@ -127,7 +127,7 @@ def screen(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_screen(image2.im))
 
 
-def soft_light(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def soft_light(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Superimposes two images on top of each other using the Soft Light algorithm
 
@@ -139,7 +139,7 @@ def soft_light(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_soft_light(image2.im))
 
 
-def hard_light(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def hard_light(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Superimposes two images on top of each other using the Hard Light algorithm
 
@@ -151,7 +151,7 @@ def hard_light(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_hard_light(image2.im))
 
 
-def overlay(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def overlay(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """
     Superimposes two images on top of each other using the Overlay algorithm
 
@@ -164,8 +164,11 @@ def overlay(image1: Image.Image, image2: Image.Image) -> Image.Image:
 
 
 def add(
-    image1: Image.Image, image2: Image.Image, scale: float = 1.0, offset: float = 0
-) -> Image.Image:
+    image1: Image.ImageType,
+    image2: Image.ImageType,
+    scale: float = 1.0,
+    offset: float = 0,
+) -> Image.ImageType:
     """
     Adds two images, dividing the result by scale and adding the
     offset. If omitted, scale defaults to 1.0, and offset to 0.0. ::
@@ -181,8 +184,11 @@ def add(
 
 
 def subtract(
-    image1: Image.Image, image2: Image.Image, scale: float = 1.0, offset: float = 0
-) -> Image.Image:
+    image1: Image.ImageType,
+    image2: Image.ImageType,
+    scale: float = 1.0,
+    offset: float = 0,
+) -> Image.ImageType:
     """
     Subtracts two images, dividing the result by scale and adding the offset.
     If omitted, scale defaults to 1.0, and offset to 0.0. ::
@@ -197,7 +203,7 @@ def subtract(
     return image1._new(image1.im.chop_subtract(image2.im, scale, offset))
 
 
-def add_modulo(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def add_modulo(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """Add two images, without clipping the result. ::
 
         out = ((image1 + image2) % MAX)
@@ -210,7 +216,9 @@ def add_modulo(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_add_modulo(image2.im))
 
 
-def subtract_modulo(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def subtract_modulo(
+    image1: Image.ImageType, image2: Image.ImageType
+) -> Image.ImageType:
     """Subtract two images, without clipping the result. ::
 
         out = ((image1 - image2) % MAX)
@@ -223,7 +231,7 @@ def subtract_modulo(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_subtract_modulo(image2.im))
 
 
-def logical_and(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def logical_and(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """Logical AND between two images.
 
     Both of the images must have mode "1". If you would like to perform a
@@ -241,7 +249,7 @@ def logical_and(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_and(image2.im))
 
 
-def logical_or(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def logical_or(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """Logical OR between two images.
 
     Both of the images must have mode "1". ::
@@ -256,7 +264,7 @@ def logical_or(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_or(image2.im))
 
 
-def logical_xor(image1: Image.Image, image2: Image.Image) -> Image.Image:
+def logical_xor(image1: Image.ImageType, image2: Image.ImageType) -> Image.ImageType:
     """Logical XOR between two images.
 
     Both of the images must have mode "1". ::
@@ -271,7 +279,9 @@ def logical_xor(image1: Image.Image, image2: Image.Image) -> Image.Image:
     return image1._new(image1.im.chop_xor(image2.im))
 
 
-def blend(image1: Image.Image, image2: Image.Image, alpha: float) -> Image.Image:
+def blend(
+    image1: Image.ImageType, image2: Image.ImageType, alpha: float
+) -> Image.ImageType:
     """Blend images using constant transparency weight. Alias for
     :py:func:`PIL.Image.blend`.
 
@@ -282,8 +292,8 @@ def blend(image1: Image.Image, image2: Image.Image, alpha: float) -> Image.Image
 
 
 def composite(
-    image1: Image.Image, image2: Image.Image, mask: Image.Image
-) -> Image.Image:
+    image1: Image.ImageType, image2: Image.ImageType, mask: Image.ImageType
+) -> Image.ImageType:
     """Create composite using transparency mask. Alias for
     :py:func:`PIL.Image.composite`.
 
@@ -293,7 +303,9 @@ def composite(
     return Image.composite(image1, image2, mask)
 
 
-def offset(image: Image.Image, xoffset: int, yoffset: int | None = None) -> Image.Image:
+def offset(
+    image: Image.ImageType, xoffset: int, yoffset: int | None = None
+) -> Image.ImageType:
     """Returns a copy of the image where data has been offset by the given
     distances. Data wraps around the edges. If ``yoffset`` is omitted, it
     is assumed to be equal to ``xoffset``.