Allow encoderconfig and encoderinfo to be set for appended TIFF images

Tests/test_file_tiff.py

@@ -661,6 +661,18 @@ def test_rowsperstrip(self, tmp_path: Path) -> None:
             assert isinstance(im, TiffImagePlugin.TiffImageFile)
             assert im.tag_v2[278] == 256
 
+        im = hopper()
+        im2 = Image.new("L", (128, 128))
+        im2.encoderinfo = {"tiffinfo": {278: 256}}
+        im.save(outfile, save_all=True, append_images=[im2])
+
+        with Image.open(outfile) as im:
+            assert isinstance(im, TiffImagePlugin.TiffImageFile)
+            assert im.tag_v2[278] == 128
+
+            im.seek(1)
+            assert im.tag_v2[278] == 256
+
     def test_strip_raw(self) -> None:
         infile = "Tests/images/tiff_strip_raw.tif"
         with Image.open(infile) as im:

docs/handbook/image-file-formats.rst

@@ -1162,9 +1162,7 @@ The :py:meth:`~PIL.Image.Image.save` method can take the following keyword argum
 
 **append_images**
     A list of images to append as additional frames. Each of the
-    images in the list can be single or multiframe images. Note however, that for
-    correct results, all the appended images should have the same
-    ``encoderinfo`` and ``encoderconfig`` properties.
+    images in the list can be single or multiframe images.
 
     .. versionadded:: 4.2.0
 

src/PIL/Image.py

@@ -2475,7 +2475,21 @@ def save(
            format to use is determined from the filename extension.
            If a file object was used instead of a filename, this
            parameter should always be used.
-        :param params: Extra parameters to the image writer.
+        :param params: Extra parameters to the image writer. These can also be
+           set on the image itself through ``encoderinfo``. This is useful when
+           saving multiple images::
+
+             # Saving XMP data to a single image
+             from PIL import Image
+             red = Image.new("RGB", (1, 1), "#f00")
+             red.save("out.mpo", xmp=b"test")
+
+             # Saving XMP data to the second frame of an image
+             from PIL import Image
+             black = Image.new("RGB", (1, 1))
+             red = Image.new("RGB", (1, 1), "#f00")
+             red.encoderinfo = {"xmp": b"test"}
+             black.save("out.mpo", save_all=True, append_images=[red])
         :returns: None
         :exception ValueError: If the output format could not be determined
            from the file name.  Use the format option to solve this.

src/PIL/TiffImagePlugin.py

@@ -2295,22 +2295,19 @@
 
 
 def _save_all(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
-    encoderinfo = im.encoderinfo.copy()
-    encoderconfig = im.encoderconfig
-    append_images = list(encoderinfo.get("append_images", []))
+    append_images = list(im.encoderinfo.get("append_images", []))
     if not hasattr(im, "n_frames") and not append_images:
         return _save(im, fp, filename)
 
     cur_idx = im.tell()
     try:
         with AppendingTiffWriter(fp) as tf:
             for ims in [im] + append_images:
-                ims.encoderinfo = encoderinfo
-                ims.encoderconfig = encoderconfig
-                if not hasattr(ims, "n_frames"):
-                    nfr = 1
-                else:
-                    nfr = ims.n_frames
+                if not hasattr(ims, "encoderinfo"):
+                    ims.encoderinfo = {}
+                if not hasattr(ims, "encoderconfig"):
+                    ims.encoderconfig = ()
+                nfr = getattr(ims, "n_frames", 1)
 
                 for idx in range(nfr):
                     ims.seek(idx)