Merge pull request #6800 from radarhere/int_ascii

Resolves #6799

Tests/test_file_tiff_metadata.py

@@ -185,20 +185,21 @@ def test_iptc(tmp_path):
         im.save(out)
 
 
-def test_writing_bytes_to_ascii(tmp_path):
-    im = hopper()
+@pytest.mark.parametrize("value, expected", ((b"test", "test"), (1, "1")))
+def test_writing_other_types_to_ascii(value, expected, tmp_path):
     info = TiffImagePlugin.ImageFileDirectory_v2()
 
     tag = TiffTags.TAGS_V2[271]
     assert tag.type == TiffTags.ASCII
 
-    info[271] = b"test"
+    info[271] = value
 
+    im = hopper()
     out = str(tmp_path / "temp.tiff")
     im.save(out, tiffinfo=info)
 
     with Image.open(out) as reloaded:
-        assert reloaded.tag_v2[271] == "test"
+        assert reloaded.tag_v2[271] == expected
 
 
 def test_writing_int_to_bytes(tmp_path):

src/PIL/TiffImagePlugin.py

@@ -732,6 +732,8 @@ def load_string(self, data, legacy_api=True):
     @_register_writer(2)
     def write_string(self, value):
         # remerge of https://github.com/python-pillow/Pillow/pull/1416
+        if isinstance(value, int):
+            value = str(value)
         if not isinstance(value, bytes):
             value = value.encode("ascii", "replace")
         return value + b"\0"