From 86d5c5c3894f58895f31287081cdd146f5fe00f7 Mon Sep 17 00:00:00 2001
From: wiredfool <eric-github@soroos.net>
Date: Mon, 7 Apr 2014 16:01:49 -0700
Subject: [PATCH] Have the tempfile use a suffix with a dot

---
 PIL/Image.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/PIL/Image.py b/PIL/Image.py
index 40a467d12..359aae716 100644
--- a/PIL/Image.py
+++ b/PIL/Image.py
@@ -505,8 +505,11 @@ class Image:
 
     def _dump(self, file=None, format=None):
         import tempfile, os
+        suffix = ''
+        if format:
+            suffix = '.'+format
         if not file:
-            f, file = tempfile.mkstemp(format or '')
+            f, file = tempfile.mkstemp(suffix)
             os.close(f)
             
         self.load()