From b5160591bc9da2425ff15b632215139eafc2cce6 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Fri, 7 Jan 2022 16:29:38 +1100
Subject: [PATCH] Return an empty bytestring from tobytes() for an empty image

---
 Tests/test_image.py | 5 +++++
 src/PIL/Image.py    | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/Tests/test_image.py b/Tests/test_image.py
index 4dde66f11..2d46d760d 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -786,6 +786,11 @@ class TestImage:
                 34665: 196,
             }
 
+    @pytest.mark.parametrize("size", ((1, 0), (0, 1), (0, 0)))
+    def test_zero_tobytes(self, size):
+        im = Image.new("RGB", size)
+        assert im.tobytes() == b""
+
     def test_categories_deprecation(self):
         with pytest.warns(DeprecationWarning):
             assert hopper().category == 0
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 0bafd3907..69089a290 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -716,6 +716,9 @@ class Image:
 
         self.load()
 
+        if self.width == 0 or self.height == 0:
+            return b""
+
         # unpack data
         e = _getencoder(self.mode, encoder_name, args)
         e.setimage(self.im)