--- Image.py.orig	2012-06-01 19:37:25.158096324 -0400
+++ Image.py	2012-06-01 19:44:30.030094635 -0400
@@ -486,10 +486,12 @@
         if not file:
             file = tempfile.mktemp()
         self.load()
-        if not format or format == "PPM":
+        if not format:
+            format = "PPM"
+        file = file + "." + format
+        if format == "PPM":
             self.im.save_ppm(file)
         else:
-            file = file + "." + format
             self.save(file, format)
         return file