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Merge pull request #1996 from uploadcare/test-for-1986

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Improve test for #1986
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wiredfool 2016-06-30 20:16:54 +01:00 committed by GitHub
commit d553a9d603
1 changed files with 5 additions and 16 deletions
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21
Tests/test_image_convert.py
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@ -123,25 +123,14 @@ class TestImageConvert(PillowTestCase):
self.assertNotIn('transparency', p.info)
p.save(f)
# ref https://github.com/python-pillow/Pillow/issues/1979
def test_p_la(self):
def L(rgb):
return int((rgb[0] * 299 + rgb[1] * 587 + rgb[2] * 114) / 1000)
im = hopper('RGBA')
alpha = hopper('L')
im.putalpha(alpha)
def convert_to_gray(im, pixel):
if im.mode == 'P':
color_id = im.getpixel(pixel)
color = im.getpalette()[color_id * 3:(color_id+1)*3]
return L(color)
elif im.mode == 'LA':
color = im.getpixel(pixel)
return color[0]
comparable = im.convert('P').convert('LA').split()[1]
im_p = hopper('P')
im_la = im_p.convert('LA')
self.assertEqual(convert_to_gray(im_p, (5, 5)),
convert_to_gray(im_la, (5, 5)))
self.assert_image_similar(alpha, comparable, 5)
if __name__ == '__main__':