Use TIFF orientation

Tests/test_file_libtiff.py

@@ -831,3 +831,12 @@ class TestFileLibTiff(LibTiffTestCase):
         self.assert_image_equal_tofile(
             im, "Tests/images/old-style-jpeg-compression.png"
         )
+
+    def test_orientation(self):
+        base_im = Image.open("Tests/images/g4_orientation_1.tif")
+
+        for i in range(2, 9):
+            im = Image.open("Tests/images/g4_orientation_" + str(i) + ".tif")
+            im.load()
+
+            self.assert_image_similar(base_im, im, 0.7)

src/PIL/TiffImagePlugin.py

@@ -1098,6 +1098,20 @@ class TiffImageFile(ImageFile.ImageFile):
         return super(TiffImageFile, self).load()
 
     def load_end(self):
+        if self._tile_orientation:
+            method = {
+                2: Image.FLIP_LEFT_RIGHT,
+                3: Image.ROTATE_180,
+                4: Image.FLIP_TOP_BOTTOM,
+                5: Image.TRANSPOSE,
+                6: Image.ROTATE_270,
+                7: Image.TRANSVERSE,
+                8: Image.ROTATE_90,
+            }.get(self._tile_orientation)
+            if method is not None:
+                self.im = self.im.transpose(method)
+                self._size = self.im.size
+
         # allow closing if we're on the first frame, there's no next
         # This is the ImageFile.load path only, libtiff specific below.
         if not self._is_animated:
@@ -1181,6 +1195,9 @@ class TiffImageFile(ImageFile.ImageFile):
 
         self.tile = []
         self.readonly = 0
+
+        self.load_end()
+
         # libtiff closed the fp in a, we need to close self.fp, if possible
         if self._exclusive_fp and not self._is_animated:
             self.fp.close()
@@ -1388,6 +1405,8 @@ class TiffImageFile(ImageFile.ImageFile):
             palette = [o8(b // 256) for b in self.tag_v2[COLORMAP]]
             self.palette = ImagePalette.raw("RGB;L", b"".join(palette))
 
+        self._tile_orientation = self.tag_v2.get(0x0112)
+
     def _close__fp(self):
         try:
             if self.__fp != self.fp: