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56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from PIL import Image
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from PIL import ImageEnhance
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class TestImageEnhance(PillowTestCase):
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def test_sanity(self):
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# FIXME: assert_image
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# Implicit asserts no exception:
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ImageEnhance.Color(hopper()).enhance(0.5)
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ImageEnhance.Contrast(hopper()).enhance(0.5)
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ImageEnhance.Brightness(hopper()).enhance(0.5)
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ImageEnhance.Sharpness(hopper()).enhance(0.5)
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def test_crash(self):
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# crashes on small images
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im = Image.new("RGB", (1, 1))
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ImageEnhance.Sharpness(im).enhance(0.5)
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def _half_transparent_image(self):
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# returns an image, half transparent, half solid
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im = hopper('RGB')
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transparent = Image.new('L', im.size, 0)
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solid = Image.new('L', (im.size[0]//2, im.size[1]), 255)
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transparent.paste(solid, (0, 0))
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im.putalpha(transparent)
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return im
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def _check_alpha(self, im, original, op, amount):
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self.assertEqual(im.getbands(), original.getbands())
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self.assert_image_equal(im.split()[-1], original.split()[-1],
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"Diff on %s: %s" % (op, amount))
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def test_alpha(self):
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# Issue https://github.com/python-pillow/Pillow/issues/899
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# Is alpha preserved through image enhancement?
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original = self._half_transparent_image()
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for op in ['Color', 'Brightness', 'Contrast', 'Sharpness']:
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for amount in [0, 0.5, 1.0]:
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self._check_alpha(getattr(ImageEnhance, op)(original).enhance(amount),
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original, op, amount)
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if __name__ == '__main__':
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unittest.main()
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# End of file
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