diff --git a/src/PIL/BlpImagePlugin.py b/src/PIL/BlpImagePlugin.py
index 782e28cf5df..2db115ccc4f 100644
--- a/src/PIL/BlpImagePlugin.py
+++ b/src/PIL/BlpImagePlugin.py
@@ -35,6 +35,7 @@
 import struct
 from enum import IntEnum
 from io import BytesIO
+from typing import IO
 
 from . import Image, ImageFile
 
@@ -448,7 +449,7 @@ def encode(self, bufsize):
         return len(data), 0, data
 
 
-def _save(im, fp, filename):
+def _save(im: Image.Image, fp: IO[bytes], filename: str) -> None:
     if im.mode != "P":
         msg = "Unsupported BLP image mode"
         raise ValueError(msg)
diff --git a/src/PIL/EpsImagePlugin.py b/src/PIL/EpsImagePlugin.py
index 5a44baa491e..d24a2ba80f0 100644
--- a/src/PIL/EpsImagePlugin.py
+++ b/src/PIL/EpsImagePlugin.py
@@ -228,7 +228,7 @@ def _open(self) -> None:
         reading_trailer_comments = False
         trailer_reached = False
 
-        def check_required_header_comments():
+        def check_required_header_comments() -> None:
             if "PS-Adobe" not in self.info:
                 msg = 'EPS header missing "%!PS-Adobe" comment'
                 raise SyntaxError(msg)
diff --git a/src/PIL/FpxImagePlugin.py b/src/PIL/FpxImagePlugin.py
index 4ba93bb3912..b3e6c6e362b 100644
--- a/src/PIL/FpxImagePlugin.py
+++ b/src/PIL/FpxImagePlugin.py
@@ -70,7 +70,7 @@ def _open(self):
 
         self._open_index(1)
 
-    def _open_index(self, index=1):
+    def _open_index(self, index: int = 1) -> None:
         #
         # get the Image Contents Property Set
 
@@ -85,7 +85,7 @@ def _open_index(self, index=1):
         size = max(self.size)
         i = 1
         while size > 64:
-            size = size / 2
+            size = size // 2
             i += 1
         self.maxid = i - 1
 
@@ -118,7 +118,7 @@ def _open_index(self, index=1):
 
         self._open_subimage(1, self.maxid)
 
-    def _open_subimage(self, index=1, subimage=0):
+    def _open_subimage(self, index: int = 1, subimage: int = 0) -> None:
         #
         # setup tile descriptors for a given subimage
 
diff --git a/src/PIL/ImageEnhance.py b/src/PIL/ImageEnhance.py
index 93a50d2a2b9..d7e99a96815 100644
--- a/src/PIL/ImageEnhance.py
+++ b/src/PIL/ImageEnhance.py
@@ -23,7 +23,10 @@
 
 
 class _Enhance:
-    def enhance(self, factor):
+    image: Image.Image
+    degenerate: Image.Image
+
+    def enhance(self, factor: float) -> Image.Image:
         """
         Returns an enhanced image.
 
@@ -46,7 +49,7 @@ 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():
@@ -63,7 +66,7 @@ class Contrast(_Enhance):
     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)
@@ -80,7 +83,7 @@ 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)
 
@@ -96,7 +99,7 @@ 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)
 
diff --git a/src/PIL/ImageFilter.py b/src/PIL/ImageFilter.py
index 43e700b7b30..02288e13576 100644
--- a/src/PIL/ImageFilter.py
+++ b/src/PIL/ImageFilter.py
@@ -18,7 +18,8 @@
 
 import abc
 import functools
-from typing import Sequence
+from types import ModuleType
+from typing import Any, Sequence
 
 
 class Filter:
@@ -57,7 +58,13 @@ class Kernel(BuiltinFilter):
 
     name = "Kernel"
 
-    def __init__(self, size, kernel, scale=None, offset=0):
+    def __init__(
+        self,
+        size: tuple[int, int],
+        kernel: Sequence[float],
+        scale: float | None = None,
+        offset: float = 0,
+    ) -> None:
         if scale is None:
             # default scale is sum of kernel
             scale = functools.reduce(lambda a, b: a + b, kernel)
@@ -194,10 +201,8 @@ class BoxBlur(MultibandFilter):
 
     name = "BoxBlur"
 
-    def __init__(self, radius):
-        xy = radius
-        if not isinstance(xy, (tuple, list)):
-            xy = (xy, xy)
+    def __init__(self, radius: float | Sequence[float]) -> None:
+        xy = radius if isinstance(radius, (tuple, list)) else (radius, radius)
         if xy[0] < 0 or xy[1] < 0:
             msg = "radius must be >= 0"
             raise ValueError(msg)
@@ -381,7 +386,9 @@ class Color3DLUT(MultibandFilter):
 
     name = "Color 3D LUT"
 
-    def __init__(self, size, table, channels=3, target_mode=None, **kwargs):
+    def __init__(
+        self, size, table, channels: int = 3, target_mode: str | None = None, **kwargs
+    ):
         if channels not in (3, 4):
             msg = "Only 3 or 4 output channels are supported"
             raise ValueError(msg)
@@ -395,7 +402,7 @@ def __init__(self, size, table, channels=3, target_mode=None, **kwargs):
         items = size[0] * size[1] * size[2]
         wrong_size = False
 
-        numpy = None
+        numpy: ModuleType | None = None
         if hasattr(table, "shape"):
             try:
                 import numpy
@@ -442,7 +449,7 @@ def __init__(self, size, table, channels=3, target_mode=None, **kwargs):
         self.table = table
 
     @staticmethod
-    def _check_size(size):
+    def _check_size(size: Any) -> list[int]:
         try:
             _, _, _ = size
         except ValueError as e:
diff --git a/src/PIL/ImageMorph.py b/src/PIL/ImageMorph.py
index 6ee8c4f253d..6a43983d33d 100644
--- a/src/PIL/ImageMorph.py
+++ b/src/PIL/ImageMorph.py
@@ -200,7 +200,7 @@ def __init__(
         elif patterns is not None:
             self.lut = LutBuilder(patterns=patterns).build_lut()
 
-    def apply(self, image: Image.Image):
+    def apply(self, image: Image.Image) -> tuple[int, Image.Image]:
         """Run a single morphological operation on an image
 
         Returns a tuple of the number of changed pixels and the
@@ -216,7 +216,7 @@ def apply(self, image: Image.Image):
         count = _imagingmorph.apply(bytes(self.lut), image.im.id, outimage.im.id)
         return count, outimage
 
-    def match(self, image: Image.Image):
+    def match(self, image: Image.Image) -> list[tuple[int, int]]:
         """Get a list of coordinates matching the morphological operation on
         an image.
 
@@ -231,7 +231,7 @@ def match(self, image: Image.Image):
             raise ValueError(msg)
         return _imagingmorph.match(bytes(self.lut), image.im.id)
 
-    def get_on_pixels(self, image: Image.Image):
+    def get_on_pixels(self, image: Image.Image) -> list[tuple[int, int]]:
         """Get a list of all turned on pixels in a binary image
 
         Returns a list of tuples of (x,y) coordinates
diff --git a/src/PIL/Jpeg2KImagePlugin.py b/src/PIL/Jpeg2KImagePlugin.py
index ce6342bdba2..e6395b1cb96 100644
--- a/src/PIL/Jpeg2KImagePlugin.py
+++ b/src/PIL/Jpeg2KImagePlugin.py
@@ -34,7 +34,7 @@ def __init__(self, fp, length=-1):
         self.length = length
         self.remaining_in_box = -1
 
-    def _can_read(self, num_bytes):
+    def _can_read(self, num_bytes: int) -> bool:
         if self.has_length and self.fp.tell() + num_bytes > self.length:
             # Outside box: ensure we don't read past the known file length
             return False
@@ -44,7 +44,7 @@ def _can_read(self, num_bytes):
         else:
             return True  # No length known, just read
 
-    def _read_bytes(self, num_bytes):
+    def _read_bytes(self, num_bytes: int) -> bytes:
         if not self._can_read(num_bytes):
             msg = "Not enough data in header"
             raise SyntaxError(msg)
@@ -74,7 +74,7 @@ def has_next_box(self) -> bool:
         else:
             return True
 
-    def next_box_type(self):
+    def next_box_type(self) -> bytes:
         # Skip the rest of the box if it has not been read
         if self.remaining_in_box > 0:
             self.fp.seek(self.remaining_in_box, os.SEEK_CUR)
diff --git a/src/PIL/PaletteFile.py b/src/PIL/PaletteFile.py
index dc31754020e..eaed5367c99 100644
--- a/src/PIL/PaletteFile.py
+++ b/src/PIL/PaletteFile.py
@@ -48,5 +48,5 @@ def __init__(self, fp):
 
         self.palette = b"".join(self.palette)
 
-    def getpalette(self):
+    def getpalette(self) -> tuple[bytes, str]:
         return self.palette, self.rawmode
diff --git a/src/PIL/QoiImagePlugin.py b/src/PIL/QoiImagePlugin.py
index cea8b60da81..f2cf06d0dd7 100644
--- a/src/PIL/QoiImagePlugin.py
+++ b/src/PIL/QoiImagePlugin.py
@@ -38,7 +38,7 @@ def _open(self) -> None:
 class QoiDecoder(ImageFile.PyDecoder):
     _pulls_fd = True
 
-    def _add_to_previous_pixels(self, value):
+    def _add_to_previous_pixels(self, value: bytes | bytearray) -> None:
         self._previous_pixel = value
 
         r, g, b, a = value
diff --git a/src/PIL/SpiderImagePlugin.py b/src/PIL/SpiderImagePlugin.py
index 5b8ad47f0cd..e5242395f92 100644
--- a/src/PIL/SpiderImagePlugin.py
+++ b/src/PIL/SpiderImagePlugin.py
@@ -233,7 +233,7 @@ def loadImageSeries(filelist=None):
 # For saving images in Spider format
 
 
-def makeSpiderHeader(im):
+def makeSpiderHeader(im: Image.Image) -> list[bytes]:
     nsam, nrow = im.size
     lenbyt = nsam * 4  # There are labrec records in the header
     labrec = int(1024 / lenbyt)
diff --git a/src/PIL/WebPImagePlugin.py b/src/PIL/WebPImagePlugin.py
index ff7402dca32..463d6a62398 100644
--- a/src/PIL/WebPImagePlugin.py
+++ b/src/PIL/WebPImagePlugin.py
@@ -117,7 +117,7 @@ def seek(self, frame: int) -> None:
         # Set logical frame to requested position
         self.__logical_frame = frame
 
-    def _reset(self, reset=True):
+    def _reset(self, reset: bool = True) -> None:
         if reset:
             self._decoder.reset()
         self.__physical_frame = 0