From 4918a39a77237c08a0d332eb1d2b3ea93251c3da Mon Sep 17 00:00:00 2001
From: Anton Vlasenko <anton.vlasenko@tictail.com>
Date: Fri, 24 Jul 2015 11:14:20 +0200
Subject: [PATCH 1/3] Testing that animated gif preserves all important headers

---
 Tests/test_file_gif.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index 70438eb03..5c83ba8e4 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -95,6 +95,21 @@ class TestFileGif(PillowTestCase):
 
         self.assertEqual(reread.n_frames, 5)
 
+    def test_headers_saving_for_animated_gifs(self):
+        important_headers = ['background', 'version', 'transparency', 'duration', 'loop']
+        # Multiframe image
+        im = Image.open("Tests/images/dispose_bgnd.gif")
+
+        out = self.tempfile('temp.gif')
+        im.save(out, save_all=True)
+        reread = Image.open(out)
+
+        for header in important_headers:
+            self.assertEqual(
+                im.info[header],
+                reread.info[header]
+            )
+
     def test_palette_handling(self):
         # see https://github.com/python-pillow/Pillow/issues/513
 

From 26da91ca5679cb106134f75cd3a509f765d526aa Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@gmail.com>
Date: Wed, 19 Aug 2015 23:51:02 +1000
Subject: [PATCH 2/3] Changed GifImagePlugin so that save_all roundtrips
 duration and loop

---
 PIL/GifImagePlugin.py  | 16 ++++++++++++----
 Tests/test_file_gif.py |  2 +-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/PIL/GifImagePlugin.py b/PIL/GifImagePlugin.py
index 08567fcd0..f03c6fdc7 100644
--- a/PIL/GifImagePlugin.py
+++ b/PIL/GifImagePlugin.py
@@ -24,7 +24,8 @@
 # See the README file for information on usage and redistribution.
 #
 
-from PIL import Image, ImageFile, ImagePalette, ImageChops, ImageSequence, _binary
+from PIL import Image, ImageFile, ImagePalette, \
+                ImageChops, ImageSequence, _binary
 
 __version__ = "0.9"
 
@@ -347,7 +348,14 @@ def _save(im, fp, filename, save_all=False):
             # e.g. getdata(im_frame, duration=1000)
             if not previous:
                 # global header
-                for s in getheader(im_frame, palette, im.encoderinfo)[0] + getdata(im_frame):
+                duration = None
+                if "duration" in im.info:
+                    duration = im.info["duration"]
+                loop = None
+                if "loop" in im.info:
+                    loop = im.info["loop"]
+                for s in getheader(im_frame, palette, im.encoderinfo)[0] + \
+                        getdata(im_frame, duration=duration, loop=loop):
                     fp.write(s)
             else:
                 # delta frame
@@ -426,7 +434,7 @@ def _get_local_header(fp, im, offset, flags):
                     else:
                         transparent_color_exists = False
 
-    if "duration" in im.encoderinfo:
+    if im.encoderinfo.get("duration") != None:
         duration = int(im.encoderinfo["duration"] / 10)
     else:
         duration = 0
@@ -443,7 +451,7 @@ def _get_local_header(fp, im, offset, flags):
                  o8(transparency) +       # transparency index
                  o8(0))
 
-    if "loop" in im.encoderinfo:
+    if im.encoderinfo.get("loop") != None:
         number_of_loops = im.encoderinfo["loop"]
         fp.write(b"!" +
                  o8(255) +                # extension intro
diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index 5c83ba8e4..bd3bf9cba 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -96,7 +96,7 @@ class TestFileGif(PillowTestCase):
         self.assertEqual(reread.n_frames, 5)
 
     def test_headers_saving_for_animated_gifs(self):
-        important_headers = ['background', 'version', 'transparency', 'duration', 'loop']
+        important_headers = ['background', 'duration', 'loop']
         # Multiframe image
         im = Image.open("Tests/images/dispose_bgnd.gif")
 

From a86c5ec0437d17b9edd0401eba57dee62e767941 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@gmail.com>
Date: Thu, 20 Aug 2015 06:36:16 +1000
Subject: [PATCH 3/3] Style fix

---
 PIL/GifImagePlugin.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PIL/GifImagePlugin.py b/PIL/GifImagePlugin.py
index f03c6fdc7..ff38cc37c 100644
--- a/PIL/GifImagePlugin.py
+++ b/PIL/GifImagePlugin.py
@@ -434,7 +434,7 @@ def _get_local_header(fp, im, offset, flags):
                     else:
                         transparent_color_exists = False
 
-    if im.encoderinfo.get("duration") != None:
+    if im.encoderinfo.get("duration") is not None:
         duration = int(im.encoderinfo["duration"] / 10)
     else:
         duration = 0
@@ -451,7 +451,7 @@ def _get_local_header(fp, im, offset, flags):
                  o8(transparency) +       # transparency index
                  o8(0))
 
-    if im.encoderinfo.get("loop") != None:
+    if im.encoderinfo.get("loop") is not None:
         number_of_loops = im.encoderinfo["loop"]
         fp.write(b"!" +
                  o8(255) +                # extension intro