use new rawmodes in BMP and TGA image plugins

Author: Yay295

src/PIL/BmpImagePlugin.py

@@ -43,7 +43,7 @@
     1: ("P", "P;1"),
     4: ("P", "P;4"),
     8: ("P", "P"),
-    16: ("RGB", "BGR;15"),
+    16: ("RGB", "XRGB;1555"),
     24: ("RGB", "BGR"),
     32: ("RGB", "BGRX"),
 }
@@ -205,8 +205,8 @@ def _bitmap(self, header=0, offset=0):
                 (32, (0xFF000000, 0xFF00, 0xFF, 0xFF0000)): "BGAR",
                 (32, (0x0, 0x0, 0x0, 0x0)): "BGRA",
                 (24, (0xFF0000, 0xFF00, 0xFF)): "BGR",
-                (16, (0xF800, 0x7E0, 0x1F)): "BGR;16",
-                (16, (0x7C00, 0x3E0, 0x1F)): "BGR;15",
+                (16, (0xF800, 0x7E0, 0x1F)): "RGB;565",
+                (16, (0x7C00, 0x3E0, 0x1F)): "XRGB;1555",
             }
             if file_info["bits"] in SUPPORTED:
                 if (

src/PIL/TgaImagePlugin.py

@@ -36,7 +36,7 @@
     (3, 1): "1",
     (3, 8): "L",
     (3, 16): "LA",
-    (2, 16): "BGR;5",
+    (2, 16): "ARGB;1555",
     (2, 24): "BGR",
     (2, 32): "BGRA",
 }
@@ -118,8 +118,9 @@ def _open(self) -> None:
             start, size, mapdepth = i16(s, 3), i16(s, 5), s[7]
             if mapdepth == 16:
                 self.palette = ImagePalette.raw(
-                    "BGR;15", b"\0" * 2 * start + self.fp.read(2 * size)
+                    "ARGB;1555", b"\0" * 2 * start + self.fp.read(2 * size)
                 )
+                self.palette.mode = "RGBA"
             elif mapdepth == 24:
                 self.palette = ImagePalette.raw(
                     "BGR", b"\0" * 3 * start + self.fp.read(3 * size)