Removed support for RGB bitcount 8

Tests/test_file_dds.py

@@ -41,7 +41,7 @@ TEST_FILE_UNCOMPRESSED_RGB_WITH_ALPHA = "Tests/images/uncompressed_rgb.dds"
         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"),
     [

src/PIL/DdsImagePlugin.py

@@ -351,9 +351,7 @@ class DdsImageFile(ImageFile.ImageFile):
             # 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: