From cdf4936c07a48372f9120afb5a83ed426db0f14a Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Mon, 29 Jun 2020 21:20:57 +1000
Subject: [PATCH] Fixed loading non-RGBA mode images with dispose background

---
 .../images/apng/dispose_op_background_p_mode.png | Bin 0 -> 1239 bytes
 Tests/test_file_apng.py                          |   7 +++++++
 src/PIL/PngImagePlugin.py                        |   2 +-
 3 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 Tests/images/apng/dispose_op_background_p_mode.png

diff --git a/Tests/images/apng/dispose_op_background_p_mode.png b/Tests/images/apng/dispose_op_background_p_mode.png
new file mode 100644
index 0000000000000000000000000000000000000000..e5fb4784d260cd9fb1556011c97eb070e2d0a351
GIT binary patch
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diff --git a/Tests/test_file_apng.py b/Tests/test_file_apng.py
index deb043fdd..93aa922dd 100644
--- a/Tests/test_file_apng.py
+++ b/Tests/test_file_apng.py
@@ -104,6 +104,13 @@ def test_apng_dispose_region():
         assert im.getpixel((64, 32)) == (0, 255, 0, 255)
 
 
+def test_apng_dispose_op_background_p_mode():
+    with Image.open("Tests/images/apng/dispose_op_background_p_mode.png") as im:
+        im.seek(1)
+        im.load()
+        assert im.size == (128, 64)
+
+
 def test_apng_blend():
     with Image.open("Tests/images/apng/blend_op_source_solid.png") as im:
         im.seek(im.n_frames - 1)
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index 0ee36fcb8..3ecfd5f08 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -904,7 +904,7 @@ class PngImageFile(ImageFile.ImageFile):
                 dispose = self._prev_im.copy()
                 dispose = self._crop(dispose, self.dispose_extent)
             elif self.dispose_op == APNG_DISPOSE_OP_BACKGROUND:
-                dispose = Image.core.fill("RGBA", self.size, (0, 0, 0, 0))
+                dispose = Image.core.fill(self.im.mode, self.size)
                 dispose = self._crop(dispose, self.dispose_extent)
             else:
                 dispose = None