Merge pull request #406 from wiredfool/gif-save

Roundtrip tests for saving Gifs

Tests/test_file_gif.py

@@ -27,3 +27,22 @@ def test(optimize):
         return len(file.getvalue())
     assert_equal(test(0), 800)
     assert_equal(test(1), 38)
+
+def test_roundtrip():
+    out = tempfile('temp.gif')
+    im = lena()
+    im.save(out)
+    reread = Image.open(out)
+
+    assert_image_similar(reread.convert('RGB'), im, 50)
+
+def test_roundtrip2():
+    #see https://github.com/python-imaging/Pillow/issues/403
+    out = 'temp.gif'#tempfile('temp.gif')
+    im = Image.open('Images/lena.gif')
+    im2 = im.copy()
+    im2.save(out)
+    reread = Image.open(out)
+
+    assert_image_similar(reread.convert('RGB'), lena(), 50)
+