Removed forcing of BYTE to ASCII

Author: radarhere

Tests/test_file_libtiff.py

@@ -299,7 +299,11 @@ def check_tags(tiffinfo):
                             )
                             continue
 
-                        if libtiff and isinstance(value, bytes):
+                        if (
+                            libtiff
+                            and isinstance(value, bytes)
+                            and isinstance(tiffinfo, dict)
+                        ):
                             value = value.decode()
 
                         assert reloaded_value == value
@@ -322,6 +326,17 @@ def check_tags(tiffinfo):
             )
         TiffImagePlugin.WRITE_LIBTIFF = False
 
+    def test_xmlpacket_tag(self, tmp_path):
+        TiffImagePlugin.WRITE_LIBTIFF = True
+
+        out = str(tmp_path / "temp.tif")
+        hopper().save(out, tiffinfo={700: b"xmlpacket tag"})
+        TiffImagePlugin.WRITE_LIBTIFF = False
+
+        with Image.open(out) as reloaded:
+            if 700 in reloaded.tag_v2:
+                assert reloaded.tag_v2[700] == b"xmlpacket tag"
+
     def test_int_dpi(self, tmp_path):
         # issue #1765
         im = hopper("RGB")

src/encode.c

@@ -761,8 +761,7 @@ PyImaging_LibTiffEncoderNew(PyObject* self, PyObject* args)
             }
         }
 
-        if (PyBytes_Check(value) &&
-                (type == TIFF_BYTE || type == TIFF_UNDEFINED)) {
+        if (PyBytes_Check(value) && type == TIFF_UNDEFINED) {
             // For backwards compatibility
             type = TIFF_ASCII;
         }