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62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
from PIL import Image
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from .helper import PillowTestCase, hopper
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class TestImageReduce(PillowTestCase):
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# There are several internal implementations
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remarkable_factors = [
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1, 2, 3, 4, 5, 6, # special implementations
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(1, 2), (1, 3), (1, 4), # 1xN implementation
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(2, 1), (3, 1), (4, 1), # Nx1 implementation
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# general implementation with different paths
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(4, 6), (5, 6), (4, 7), (5, 7),
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]
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def test_args(self):
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im = Image.new('L', (10, 10))
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self.assertEqual((4, 4), im.reduce(3).size)
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self.assertEqual((4, 10), im.reduce((3, 1)).size)
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self.assertEqual((10, 4), im.reduce((1, 3)).size)
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with self.assertRaises(ValueError):
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im.reduce(0)
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with self.assertRaises(TypeError):
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im.reduce(2.0)
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with self.assertRaises(ValueError):
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im.reduce((0, 10))
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def check_correctness(self, im, factor):
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if not isinstance(factor, (list, tuple)):
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factor = (factor, factor)
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# Image.reduce() should works very similar to Image.resize(BOX)
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# when image size is dividable by the factor.
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desired_size = (im.width // factor[0], im.height // factor[1])
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im = im.crop((0, 0, desired_size[0] * factor[0], desired_size[1] * factor[1]))
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reduced = im.reduce(factor)
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resized = im.resize(desired_size, Image.BOX)
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epsilon = 0.5 * len(reduced.getbands())
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self.assert_image_similar(reduced, resized, epsilon)
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def test_mode_RGB(self):
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im = hopper('RGB')
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for factor in self.remarkable_factors:
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self.check_correctness(im, factor)
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def test_mode_LA(self):
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im = Image.open("Tests/images/transparent.png").convert('LA')
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for factor in self.remarkable_factors:
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print(factor)
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self.check_correctness(im, factor)
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def test_mode_RGBA(self):
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im = Image.open("Tests/images/transparent.png").convert('RGBA')
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for factor in self.remarkable_factors:
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print(factor)
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self.check_correctness(im, factor)
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