diff --git a/Tests/images/rgb8.dds b/Tests/images/rgb8.dds
deleted file mode 100644
index 8193e8e5ac6..00000000000
Binary files a/Tests/images/rgb8.dds and /dev/null differ
diff --git a/Tests/images/rgb8.png b/Tests/images/rgb8.png
deleted file mode 100644
index 9d22a26a446..00000000000
Binary files a/Tests/images/rgb8.png and /dev/null differ
diff --git a/Tests/test_file_dds.py b/Tests/test_file_dds.py
index da7260cbf3b..e0f9fe7de15 100644
--- a/Tests/test_file_dds.py
+++ b/Tests/test_file_dds.py
@@ -41,7 +41,7 @@
         TEST_FILE_DX10_BC1_TYPELESS,
     ),
 )
-def test_sanity_bc1(image_path):
+def test_sanity_dxt1_bc1(image_path):
     """Check DXT1 images can be opened"""
     with Image.open(TEST_FILE_DXT1.replace(".dds", ".png")) as target:
         target = target.convert("RGBA")
@@ -350,12 +350,6 @@ def test_save_unsupported_mode(tmp_path):
         im.save(out)
 
 
-def test_open_rgb8():
-    with Image.open("Tests/images/rgb8.dds") as im:
-        assert im.mode == "L"
-        assert_image_equal_tofile(im, "Tests/images/rgb8.png")
-
-
 @pytest.mark.parametrize(
     ("mode", "test_file"),
     [
diff --git a/src/PIL/DdsImagePlugin.py b/src/PIL/DdsImagePlugin.py
index 30f021b7dc5..c09a8db3b9c 100644
--- a/src/PIL/DdsImagePlugin.py
+++ b/src/PIL/DdsImagePlugin.py
@@ -9,6 +9,7 @@
 Full text of the CC0 license:
   https://creativecommons.org/publicdomain/zero/1.0/
 """
+
 import io
 import struct
 import sys
@@ -183,8 +184,8 @@ class DXGI_FORMAT(IntEnum):
     P208 = 130
     V208 = 131
     V408 = 132
-    SAMPLER_FEEDBACK_MIN_MIP_OPAQUE = 133
-    SAMPLER_FEEDBACK_MIP_REGION_USED_OPAQUE = 134
+    SAMPLER_FEEDBACK_MIN_MIP_OPAQUE = 189
+    SAMPLER_FEEDBACK_MIP_REGION_USED_OPAQUE = 190
 
 
 class D3DFMT(IntEnum):
@@ -351,9 +352,7 @@ def _open(self):
             # Texture contains uncompressed RGB data
             masks = struct.unpack("<4I", header.read(16))
             masks = {mask: ["R", "G", "B", "A"][i] for i, mask in enumerate(masks)}
-            if bitcount == 8:
-                self._mode = "L"
-            elif bitcount == 24:
+            if bitcount == 24:
                 self._mode = "RGB"
                 rawmode = masks[0x000000FF] + masks[0x0000FF00] + masks[0x00FF0000]
             elif bitcount == 32 and pfflags & DDPF.ALPHAPIXELS:
@@ -379,7 +378,7 @@ def _open(self):
             self._mode = "P"
             self.palette = ImagePalette.raw("RGBA", self.fp.read(1024))
         elif pfflags & DDPF.FOURCC:
-            data_offs = header_size + 4
+            offset = header_size + 4
             if fourcc == D3DFMT.DXT1:
                 self._mode = "RGBA"
                 self.pixel_format = "DXT1"
@@ -405,7 +404,7 @@ def _open(self):
                 self.pixel_format = "BC5"
                 n = 5
             elif fourcc == D3DFMT.DX10:
-                data_offs += 20
+                offset += 20
                 # ignoring flags which pertain to volume textures and cubemaps
                 (dxgi_format,) = struct.unpack("<I", self.fp.read(4))
                 self.fp.read(16)
@@ -462,9 +461,11 @@ def _open(self):
 
         extents = (0, 0) + self.size
         if n:
-            self.tile = [Image._Tile("bcn", extents, data_offs, (n, self.pixel_format))]
+            self.tile = [
+                ImageFile._Tile("bcn", extents, offset, (n, self.pixel_format))
+            ]
         else:
-            self.tile = [Image._Tile("raw", extents, 0, rawmode or self.mode)]
+            self.tile = [ImageFile._Tile("raw", extents, 0, rawmode or self.mode)]
 
     def load_seek(self, pos):
         pass
@@ -496,8 +497,8 @@ def _save(im, fp, filename):
     rgba_mask.append(0xFF000000 if alpha else 0)
 
     flags = DDSD.CAPS | DDSD.HEIGHT | DDSD.WIDTH | DDSD.PITCH | DDSD.PIXELFORMAT
-    bit_count = len(im.getbands()) * 8
-    stride = (im.width * bit_count + 7) // 8
+    bitcount = len(im.getbands()) * 8
+    pitch = (im.width * bitcount + 7) // 8
 
     fp.write(
         o32(DDS_MAGIC)
@@ -507,17 +508,19 @@ def _save(im, fp, filename):
             flags,  # flags
             im.height,
             im.width,
-            stride,  # pitch
+            pitch,
             0,  # depth
             0,  # mipmaps
         )
         + struct.pack("11I", *((0,) * 11))  # reserved
         # pfsize, pfflags, fourcc, bitcount
-        + struct.pack("<4I", 32, pixel_flags, 0, bit_count)
+        + struct.pack("<4I", 32, pixel_flags, 0, bitcount)
         + struct.pack("<4I", *rgba_mask)  # dwRGBABitMask
         + struct.pack("<5I", DDSCAPS.TEXTURE, 0, 0, 0, 0)
     )
-    ImageFile._save(im, fp, [Image._Tile("raw", (0, 0) + im.size, 0, (rawmode, 0, 1))])
+    ImageFile._save(
+        im, fp, [ImageFile._Tile("raw", (0, 0) + im.size, 0, (rawmode, 0, 1))]
+    )
 
 
 def _accept(prefix):
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 3f0863b1840..2853bd5964a 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -23,7 +23,6 @@
 #
 # See the README file for information on usage and redistribution.
 #
-from __future__ import annotations
 
 import atexit
 import builtins
@@ -39,7 +38,6 @@
 from collections.abc import Callable, MutableMapping
 from enum import IntEnum
 from pathlib import Path
-from typing import NamedTuple
 
 try:
     from defusedxml import ElementTree
@@ -208,13 +206,6 @@ class Quantize(IntEnum):
     FIXED = core.FIXED
 
 
-class _Tile(NamedTuple):
-    encoder_name: str
-    extents: tuple[int, int, int, int]
-    offset: int
-    args: tuple
-
-
 # --------------------------------------------------------------------
 # Registries
 
@@ -706,7 +697,6 @@ def __getstate__(self):
 
     def __setstate__(self, state):
         Image.__init__(self)
-        self.tile: list[_Tile] = []
         info, mode, size, palette, data = state
         self.info = info
         self._mode = mode
diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
index e8455d0642f..8bca19a4b8d 100644
--- a/src/PIL/ImageFile.py
+++ b/src/PIL/ImageFile.py
@@ -32,6 +32,7 @@
 import itertools
 import struct
 import sys
+from typing import NamedTuple
 
 from . import Image
 from ._util import is_path
@@ -78,6 +79,13 @@ def _tilesort(t):
     return t[2]
 
 
+class _Tile(NamedTuple):
+    encoder_name: str
+    extents: tuple[int, int, int, int]
+    offset: int
+    args: tuple | str | None
+
+
 #
 # --------------------------------------------------------------------
 # ImageFile base class
@@ -521,7 +529,7 @@ def _save(im, fp, tile, bufsize=0):
         fp.flush()
 
 
-def _encode_tile(im, fp, tile: list[Image._Tile], bufsize, fh, exc=None):
+def _encode_tile(im, fp, tile: list[_Tile], bufsize, fh, exc=None):
     for encoder_name, extents, offset, args in tile:
         if offset > 0:
             fp.seek(offset)