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Additional jpeg qtables tests

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wiredfool 2014-06-20 01:09:59 -07:00
parent fcd4c662bf
commit dfe7ff515f
1 changed files with 44 additions and 0 deletions
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44
Tests/test_file_jpeg.py
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@ -229,8 +229,52 @@ class TestFileJpeg(PillowTestCase):
qtables = im.quantization
reloaded = self.roundtrip(im, qtables=qtables, subsampling=0)
self.assertEqual(im.quantization, reloaded.quantization)
self.assert_image_similar(im, self.roundtrip(im, qtables='web_low'), 30)
self.assert_image_similar(im, self.roundtrip(im, qtables='web_high'), 30)
self.assert_image_similar(im, self.roundtrip(im, qtables='keep'), 30)
#values from wizard.txt in jpeg9-a src package.
standard_l_qtable = [int(s) for s in """
16 11 10 16 24 40 51 61
12 12 14 19 26 58 60 55
14 13 16 24 40 57 69 56
14 17 22 29 51 87 80 62
18 22 37 56 68 109 103 77
24 35 55 64 81 104 113 92
49 64 78 87 103 121 120 101
72 92 95 98 112 100 103 99
""".split(None)]
standard_chrominance_qtable= [int(s) for s in """
17 18 24 47 99 99 99 99
18 21 26 66 99 99 99 99
24 26 56 99 99 99 99 99
47 66 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
""".split(None)]
# list of qtable lists
self.assert_image_similar(im,
self.roundtrip(im,
qtables=[standard_l_qtable,
standard_chrominance_qtable]),
30)
# tuple of qtable lists
self.assert_image_similar(im,
self.roundtrip(im,
qtables=(standard_l_qtable,
standard_chrominance_qtable)),
30)
# dict of qtable lists
self.assert_image_similar(im,
self.roundtrip(im,
qtables={0:standard_l_qtable,
1:standard_chrominance_qtable}),
30)
if __name__ == '__main__':
unittest.main()