Use transposed size after opening for TIFF images

Tests/test_image_copy.py

@@ -49,5 +49,7 @@ def test_copy_zero() -> None:
 @skip_unless_feature("libtiff")
 def test_deepcopy() -> None:
     with Image.open("Tests/images/g4_orientation_5.tif") as im:
+        assert im.size == (590, 88)
+
         out = copy.deepcopy(im)
     assert out.size == (590, 88)

Tests/test_image_resize.py

@@ -300,9 +300,7 @@ class TestImageResize:
                 im.resize((10, 10), "unknown")
 
     @skip_unless_feature("libtiff")
-    def test_load_first(self) -> None:
+    def test_transposed(self) -> None:
-        # load() may change the size of the image
-        # Test that resize() is calling it before getting the size
         with Image.open("Tests/images/g4_orientation_5.tif") as im:
             im = im.resize((64, 64))
             assert im.size == (64, 64)

Tests/test_image_thumbnail.py

@@ -92,15 +92,13 @@ def test_no_resize() -> None:
 
 
 @skip_unless_feature("libtiff")
-def test_load_first() -> None:
+def test_transposed() -> None:
-    # load() may change the size of the image
-    # Test that thumbnail() is calling it before performing size calculations
     with Image.open("Tests/images/g4_orientation_5.tif") as im:
+        assert im.size == (590, 88)
+
         im.thumbnail((64, 64))
         assert im.size == (64, 10)
 
-    # Test thumbnail(), without draft(),
-    # on an image that is large enough once load() has changed the size
     with Image.open("Tests/images/g4_orientation_5.tif") as im:
         im.thumbnail((590, 88), reducing_gap=None)
         assert im.size == (590, 88)

Tests/test_numpy.py

@@ -238,8 +238,10 @@ def test_zero_size() -> None:
 
 
 @skip_unless_feature("libtiff")
-def test_load_first() -> None:
+def test_transposed() -> None:
     with Image.open("Tests/images/g4_orientation_5.tif") as im:
+        assert im.size == (590, 88)
+
         a = numpy.array(im)
         assert a.shape == (88, 590)
 

src/PIL/Image.py

@@ -2332,7 +2332,6 @@ class Image:
             msg = "reducing_gap must be 1.0 or greater"
             raise ValueError(msg)
 
-        self.load()
         if box is None:
             box = (0, 0) + self.size
 
@@ -2781,27 +2780,18 @@ class Image:
                 )
             return x, y
 
-        box = None
+        preserved_size = preserve_aspect_ratio()
-        final_size: tuple[int, int]
+        if preserved_size is None:
-        if reducing_gap is not None:
+            return
-            preserved_size = preserve_aspect_ratio()
+        final_size = preserved_size
-            if preserved_size is None:
-                return
-            final_size = preserved_size
 
+        box = None
+        if reducing_gap is not None:
             res = self.draft(
                 None, (int(size[0] * reducing_gap), int(size[1] * reducing_gap))
             )
             if res is not None:
                 box = res[1]
-        if box is None:
-            self.load()
-
-            # load() may have changed the size of the image
-            preserved_size = preserve_aspect_ratio()
-            if preserved_size is None:
-                return
-            final_size = preserved_size
 
         if self.size != final_size:
             im = self.resize(final_size, resample, box=box, reducing_gap=reducing_gap)

src/PIL/ImageFile.py

@@ -322,7 +322,7 @@ class ImageFile(Image.Image):
 
     def load_prepare(self) -> None:
         # create image memory if necessary
-        if self._im is None or self.im.mode != self.mode or self.im.size != self.size:
+        if self._im is None or self.im.mode != self.mode:
             self.im = Image.core.new(self.mode, self.size)
         # create palette (optional)
         if self.mode == "P":

src/PIL/TiffImagePlugin.py

@@ -1275,6 +1275,11 @@ class TiffImageFile(ImageFile.ImageFile):
             return self._load_libtiff()
         return super().load()
 
+    def load_prepare(self) -> None:
+        if self._im is None and self._will_be_transposed:
+            self.im = Image.core.new(self.mode, self.size[::-1])
+        ImageFile.ImageFile.load_prepare(self)
+
     def load_end(self) -> None:
         # allow closing if we're on the first frame, there's no next
         # This is the ImageFile.load path only, libtiff specific below.
@@ -1416,7 +1421,16 @@ class TiffImageFile(ImageFile.ImageFile):
         if not isinstance(xsize, int) or not isinstance(ysize, int):
             msg = "Invalid dimensions"
             raise ValueError(msg)
-        self._size = xsize, ysize
+        self._will_be_transposed = self.tag_v2.get(ExifTags.Base.Orientation) in (
+            5,
+            6,
+            7,
+            8,
+        )
+        if self._will_be_transposed:
+            self._size = ysize, xsize
+        else:
+            self._size = xsize, ysize
 
         logger.debug("- size: %s", self.size)