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test for levels

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This commit is contained in:
homm 2016-05-09 21:13:44 +02:00
parent d8c4ef349c
commit 05d1022e99
1 changed files with 17 additions and 0 deletions
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Tests/test_image_resample.py
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@ -186,5 +186,22 @@ class CoreResampleConsistencyTest(PillowTestCase):
self.run_case(self.make_case('F', 1.192093e-07))
class CoreResampleAlphaCorrectTest(PillowTestCase):
def test_levels(self):
i = Image.new('RGBA', (256, 16))
px = i.load()
for y in range(i.size[1]):
for x in range(i.size[0]):
px[x, y] = (x, x, x, 255 - y * 16)
i = i.resize((512, 32), Image.BILINEAR)
px = i.load()
for y in range(i.size[1]):
used_colors = set(px[x, y][0] for x in range(i.size[0]))
self.assertEqual(256, len(used_colors),
'All colors should present in resized image. '
'Only {0} on {1} line.'.format(len(used_colors), y))
if __name__ == '__main__':
unittest.main()