Added get_photoshop_blocks() to parse Photoshop tag

Tests/test_file_tiff.py

@@ -685,6 +685,32 @@ class TestFileTiff:
                 assert description[0]["format"] == "image/tiff"
                 assert description[3]["BitsPerSample"]["Seq"]["li"] == ["8", "8", "8"]
 
+    def test_get_photoshop_blocks(self):
+        with Image.open("Tests/images/lab.tif") as im:
+            assert list(im.get_photoshop_blocks().keys()) == [
+                1061,
+                1002,
+                1005,
+                1062,
+                1037,
+                1049,
+                1011,
+                1034,
+                10000,
+                1013,
+                1016,
+                1032,
+                1054,
+                1050,
+                1064,
+                1041,
+                1044,
+                1036,
+                1057,
+                4000,
+                4001,
+            ]
+
     def test_close_on_load_exclusive(self, tmp_path):
         # similar to test_fd_leak, but runs on unixlike os
         tmpfile = str(tmp_path / "temp.tif")

src/PIL/TiffImagePlugin.py

@@ -41,6 +41,7 @@
 import io
 import itertools
 import logging
+import math
 import os
 import struct
 import warnings
@@ -49,6 +50,8 @@ from fractions import Fraction
 from numbers import Number, Rational
 
 from . import Image, ImageFile, ImageOps, ImagePalette, TiffTags
+from ._binary import i16be as i16
+from ._binary import i32be as i32
 from ._binary import o8
 from .TiffTags import TYPES
 
@@ -1129,6 +1132,27 @@ class TiffImageFile(ImageFile.ImageFile):
         """
         return self._getxmp(self.tag_v2[700]) if 700 in self.tag_v2 else {}
 
+    def get_photoshop_blocks(self):
+        """
+        Returns a dictionary of Photoshop "Image Resource Blocks".
+        The keys are the image resource ID. For more information, see
+        https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1037727
+
+        :returns: Photoshop "Image Resource Blocks" in a dictionary.
+        """
+        blocks = {}
+        val = self.tag_v2.get(0x8649)
+        if val:
+            while val[:4] == b"8BIM":
+                id = i16(val[4:6])
+                n = math.ceil((val[6] + 1) / 2) * 2
+                size = i32(val[6 + n : 10 + n])
+                data = val[10 + n : 10 + n + size]
+                blocks[id] = {"data": data}
+
+                val = val[math.ceil((10 + n + size) / 2) * 2 :]
+        return blocks
+
     def load(self):
         if self.tile and self.use_load_libtiff:
             return self._load_libtiff()