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