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90 lines
3.1 KiB
Python
90 lines
3.1 KiB
Python
from PIL import Image, ImageFilter
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from .helper import PillowTestCase
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class TestImageOpsUsm(PillowTestCase):
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def setUp(self):
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super().setUp()
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self.im = Image.open("Tests/images/hopper.ppm")
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self.addCleanup(self.im.close)
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self.snakes = Image.open("Tests/images/color_snakes.png")
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self.addCleanup(self.snakes.close)
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def test_filter_api(self):
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test_filter = ImageFilter.GaussianBlur(2.0)
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i = self.im.filter(test_filter)
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self.assertEqual(i.mode, "RGB")
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self.assertEqual(i.size, (128, 128))
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test_filter = ImageFilter.UnsharpMask(2.0, 125, 8)
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i = self.im.filter(test_filter)
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self.assertEqual(i.mode, "RGB")
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self.assertEqual(i.size, (128, 128))
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def test_usm_formats(self):
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usm = ImageFilter.UnsharpMask
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self.assertRaises(ValueError, self.im.convert("1").filter, usm)
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self.im.convert("L").filter(usm)
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self.assertRaises(ValueError, self.im.convert("I").filter, usm)
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self.assertRaises(ValueError, self.im.convert("F").filter, usm)
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self.im.convert("RGB").filter(usm)
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self.im.convert("RGBA").filter(usm)
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self.im.convert("CMYK").filter(usm)
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self.assertRaises(ValueError, self.im.convert("YCbCr").filter, usm)
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def test_blur_formats(self):
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blur = ImageFilter.GaussianBlur
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self.assertRaises(ValueError, self.im.convert("1").filter, blur)
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blur(self.im.convert("L"))
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self.assertRaises(ValueError, self.im.convert("I").filter, blur)
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self.assertRaises(ValueError, self.im.convert("F").filter, blur)
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self.im.convert("RGB").filter(blur)
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self.im.convert("RGBA").filter(blur)
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self.im.convert("CMYK").filter(blur)
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self.assertRaises(ValueError, self.im.convert("YCbCr").filter, blur)
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def test_usm_accuracy(self):
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src = self.snakes.convert("RGB")
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i = src.filter(ImageFilter.UnsharpMask(5, 1024, 0))
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# Image should not be changed because it have only 0 and 255 levels.
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self.assertEqual(i.tobytes(), src.tobytes())
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def test_blur_accuracy(self):
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i = self.snakes.filter(ImageFilter.GaussianBlur(0.4))
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# These pixels surrounded with pixels with 255 intensity.
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# They must be very close to 255.
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for x, y, c in [
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(1, 0, 1),
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(2, 0, 1),
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(7, 8, 1),
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(8, 8, 1),
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(2, 9, 1),
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(7, 3, 0),
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(8, 3, 0),
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(5, 8, 0),
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(5, 9, 0),
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(1, 3, 0),
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(4, 3, 2),
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(4, 2, 2),
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]:
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self.assertGreaterEqual(i.im.getpixel((x, y))[c], 250)
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# Fuzzy match.
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def gp(x, y):
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return i.im.getpixel((x, y))
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self.assertTrue(236 <= gp(7, 4)[0] <= 239)
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self.assertTrue(236 <= gp(7, 5)[2] <= 239)
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self.assertTrue(236 <= gp(7, 6)[2] <= 239)
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self.assertTrue(236 <= gp(7, 7)[1] <= 239)
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self.assertTrue(236 <= gp(8, 4)[0] <= 239)
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self.assertTrue(236 <= gp(8, 5)[2] <= 239)
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self.assertTrue(236 <= gp(8, 6)[2] <= 239)
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self.assertTrue(236 <= gp(8, 7)[1] <= 239)
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