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test for issue #2195

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wiredfool 2016-12-27 03:30:47 -08:00
parent 2ba2763f0b
commit 915270ef6f
1 changed files with 23 additions and 0 deletions
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Tests/test_file_gif.py
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@ -362,5 +362,28 @@ class TestFileGif(PillowTestCase):
reread = Image.open(out)
self.assertEqual(reread.n_frames, 10)
def test_transparent_optimize(self):
# from issue #2195, if the transparent color is incorrectly
# optimized out, gif loses transparency Need a palette that
# isn't using the 0 color, and one that's > 128 items where
# the transparent color is actually the top palette entry to
# trigger the bug.
from PIL import ImagePalette
data = bytes(bytearray(range(1,254)))
palette = ImagePalette.ImagePalette("RGB", list(range(256))*3)
im = Image.new('L', (253,1))
im.frombytes(data)
im.putpalette(palette)
out = self.tempfile('temp.gif')
im.save(out, transparency=253)
reloaded = Image.open(out)
self.assertEqual(reloaded.info['transparency'], 253)
if __name__ == '__main__':
unittest.main()