updates

Backend/venv/lib/python3.12/site-packages/PIL/ImageEnhance.py

@@ -17,12 +17,16 @@
 #
 # See the README file for information on usage and redistribution.
 #
+from __future__ import annotations
 
 from . import Image, ImageFilter, ImageStat
 
 
 class _Enhance:
-    def enhance(self, factor):
+    image: Image.Image
+    degenerate: Image.Image
+
+    def enhance(self, factor: float) -> Image.Image:
         """
         Returns an enhanced image.
 
@@ -45,13 +49,15 @@ class Color(_Enhance):
     the original image.
     """
 
-    def __init__(self, image):
+    def __init__(self, image: Image.Image) -> None:
         self.image = image
         self.intermediate_mode = "L"
         if "A" in image.getbands():
             self.intermediate_mode = "LA"
 
-        self.degenerate = image.convert(self.intermediate_mode).convert(image.mode)
+        if self.intermediate_mode != image.mode:
+            image = image.convert(self.intermediate_mode).convert(image.mode)
+        self.degenerate = image
 
 
 class Contrast(_Enhance):
@@ -59,16 +65,20 @@ class Contrast(_Enhance):
 
     This class can be used to control the contrast of an image, similar
     to the contrast control on a TV set. An enhancement factor of 0.0
-    gives a solid grey image. A factor of 1.0 gives the original image.
+    gives a solid gray image. A factor of 1.0 gives the original image.
     """
 
-    def __init__(self, image):
+    def __init__(self, image: Image.Image) -> None:
         self.image = image
-        mean = int(ImageStat.Stat(image.convert("L")).mean[0] + 0.5)
-        self.degenerate = Image.new("L", image.size, mean).convert(image.mode)
+        if image.mode != "L":
+            image = image.convert("L")
+        mean = int(ImageStat.Stat(image).mean[0] + 0.5)
+        self.degenerate = Image.new("L", image.size, mean)
+        if self.degenerate.mode != self.image.mode:
+            self.degenerate = self.degenerate.convert(self.image.mode)
 
-        if "A" in image.getbands():
-            self.degenerate.putalpha(image.getchannel("A"))
+        if "A" in self.image.getbands():
+            self.degenerate.putalpha(self.image.getchannel("A"))
 
 
 class Brightness(_Enhance):
@@ -79,7 +89,7 @@ class Brightness(_Enhance):
     original image.
     """
 
-    def __init__(self, image):
+    def __init__(self, image: Image.Image) -> None:
         self.image = image
         self.degenerate = Image.new(image.mode, image.size, 0)
 
@@ -95,7 +105,7 @@ class Sharpness(_Enhance):
     original image, and a factor of 2.0 gives a sharpened image.
     """
 
-    def __init__(self, image):
+    def __init__(self, image: Image.Image) -> None:
         self.image = image
         self.degenerate = image.filter(ImageFilter.SMOOTH)