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4de5477b61
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:
if __name__ == '__main__':
unittest.main()
To every test file. It is simply noise.
The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
376 lines
11 KiB
Python
376 lines
11 KiB
Python
from .helper import PillowTestCase, hopper
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from PIL import Image
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from PIL import ImageChops
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BLACK = (0, 0, 0)
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BROWN = (127, 64, 0)
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CYAN = (0, 255, 255)
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DARK_GREEN = (0, 128, 0)
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GREEN = (0, 255, 0)
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ORANGE = (255, 128, 0)
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WHITE = (255, 255, 255)
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GREY = 128
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class TestImageChops(PillowTestCase):
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def test_sanity(self):
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im = hopper("L")
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ImageChops.constant(im, 128)
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ImageChops.duplicate(im)
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ImageChops.invert(im)
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ImageChops.lighter(im, im)
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ImageChops.darker(im, im)
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ImageChops.difference(im, im)
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ImageChops.multiply(im, im)
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ImageChops.screen(im, im)
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ImageChops.add(im, im)
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ImageChops.add(im, im, 2.0)
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ImageChops.add(im, im, 2.0, 128)
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ImageChops.subtract(im, im)
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ImageChops.subtract(im, im, 2.0)
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ImageChops.subtract(im, im, 2.0, 128)
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ImageChops.add_modulo(im, im)
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ImageChops.subtract_modulo(im, im)
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ImageChops.blend(im, im, 0.5)
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ImageChops.composite(im, im, im)
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ImageChops.offset(im, 10)
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ImageChops.offset(im, 10, 20)
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def test_add(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.add(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), ORANGE)
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def test_add_scale_offset(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.add(im1, im2, scale=2.5, offset=100)
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# Assert
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self.assertEqual(new.getbbox(), (0, 0, 100, 100))
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self.assertEqual(new.getpixel((50, 50)), (202, 151, 100))
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def test_add_clip(self):
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# Arrange
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im = hopper()
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# Act
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new = ImageChops.add(im, im)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (255, 255, 254))
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def test_add_modulo(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.add_modulo(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), ORANGE)
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def test_add_modulo_no_clip(self):
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# Arrange
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im = hopper()
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# Act
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new = ImageChops.add_modulo(im, im)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (224, 76, 254))
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def test_blend(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.blend(im1, im2, 0.5)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), BROWN)
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def test_constant(self):
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# Arrange
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im = Image.new("RGB", (20, 10))
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# Act
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new = ImageChops.constant(im, GREY)
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# Assert
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self.assertEqual(new.size, im.size)
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self.assertEqual(new.getpixel((0, 0)), GREY)
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self.assertEqual(new.getpixel((19, 9)), GREY)
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def test_darker_image(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_outline_chord_RGB.png")
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# Act
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new = ImageChops.darker(im1, im2)
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# Assert
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self.assert_image_equal(new, im2)
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def test_darker_pixel(self):
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# Arrange
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im1 = hopper()
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im2 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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# Act
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new = ImageChops.darker(im1, im2)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (240, 166, 0))
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def test_difference(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_arc_end_le_start.png")
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im2 = Image.open("Tests/images/imagedraw_arc_no_loops.png")
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# Act
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new = ImageChops.difference(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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def test_difference_pixel(self):
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# Arrange
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im1 = hopper()
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im2 = Image.open("Tests/images/imagedraw_polygon_kite_RGB.png")
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# Act
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new = ImageChops.difference(im1, im2)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (240, 166, 128))
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def test_duplicate(self):
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# Arrange
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im = hopper()
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# Act
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new = ImageChops.duplicate(im)
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# Assert
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self.assert_image_equal(new, im)
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def test_invert(self):
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# Arrange
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im = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.invert(im)
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# Assert
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self.assertEqual(new.getbbox(), (0, 0, 100, 100))
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self.assertEqual(new.getpixel((0, 0)), WHITE)
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self.assertEqual(new.getpixel((50, 50)), CYAN)
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def test_lighter_image(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_outline_chord_RGB.png")
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# Act
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new = ImageChops.lighter(im1, im2)
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# Assert
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self.assert_image_equal(new, im1)
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def test_lighter_pixel(self):
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# Arrange
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im1 = hopper()
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im2 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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# Act
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new = ImageChops.lighter(im1, im2)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (255, 255, 127))
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def test_multiply_black(self):
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"""If you multiply an image with a solid black image,
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the result is black."""
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# Arrange
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im1 = hopper()
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black = Image.new("RGB", im1.size, "black")
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# Act
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new = ImageChops.multiply(im1, black)
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# Assert
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self.assert_image_equal(new, black)
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def test_multiply_green(self):
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# Arrange
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im = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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green = Image.new("RGB", im.size, "green")
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# Act
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new = ImageChops.multiply(im, green)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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self.assertEqual(new.getpixel((25, 25)), DARK_GREEN)
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self.assertEqual(new.getpixel((50, 50)), BLACK)
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def test_multiply_white(self):
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"""If you multiply with a solid white image,
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the image is unaffected."""
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# Arrange
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im1 = hopper()
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white = Image.new("RGB", im1.size, "white")
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# Act
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new = ImageChops.multiply(im1, white)
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# Assert
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self.assert_image_equal(new, im1)
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def test_offset(self):
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# Arrange
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im = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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xoffset = 45
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yoffset = 20
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# Act
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new = ImageChops.offset(im, xoffset, yoffset)
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# Assert
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self.assertEqual(new.getbbox(), (0, 45, 100, 96))
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self.assertEqual(new.getpixel((50, 50)), BLACK)
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self.assertEqual(new.getpixel((50+xoffset, 50+yoffset)), DARK_GREEN)
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# Test no yoffset
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self.assertEqual(ImageChops.offset(im, xoffset),
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ImageChops.offset(im, xoffset, xoffset))
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def test_screen(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_ellipse_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_floodfill_RGB.png")
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# Act
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new = ImageChops.screen(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 25, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), ORANGE)
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def test_subtract(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_outline_chord_RGB.png")
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# Act
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new = ImageChops.subtract(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 50, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), GREEN)
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self.assertEqual(new.getpixel((50, 51)), BLACK)
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def test_subtract_scale_offset(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_outline_chord_RGB.png")
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# Act
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new = ImageChops.subtract(im1, im2, scale=2.5, offset=100)
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# Assert
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self.assertEqual(new.getbbox(), (0, 0, 100, 100))
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self.assertEqual(new.getpixel((50, 50)), (100, 202, 100))
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def test_subtract_clip(self):
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# Arrange
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im1 = hopper()
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im2 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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# Act
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new = ImageChops.subtract(im1, im2)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (0, 0, 127))
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def test_subtract_modulo(self):
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# Arrange
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im1 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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im2 = Image.open("Tests/images/imagedraw_outline_chord_RGB.png")
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# Act
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new = ImageChops.subtract_modulo(im1, im2)
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# Assert
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self.assertEqual(new.getbbox(), (25, 50, 76, 76))
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self.assertEqual(new.getpixel((50, 50)), GREEN)
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self.assertEqual(new.getpixel((50, 51)), BLACK)
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def test_subtract_modulo_no_clip(self):
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# Arrange
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im1 = hopper()
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im2 = Image.open("Tests/images/imagedraw_chord_RGB.png")
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# Act
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new = ImageChops.subtract_modulo(im1, im2)
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# Assert
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self.assertEqual(new.getpixel((50, 50)), (241, 167, 127))
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def test_logical(self):
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def table(op, a, b):
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out = []
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for x in (a, b):
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imx = Image.new("1", (1, 1), x)
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for y in (a, b):
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imy = Image.new("1", (1, 1), y)
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out.append(op(imx, imy).getpixel((0, 0)))
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return tuple(out)
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self.assertEqual(
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table(ImageChops.logical_and, 0, 1), (0, 0, 0, 255))
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self.assertEqual(
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table(ImageChops.logical_or, 0, 1), (0, 255, 255, 255))
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self.assertEqual(
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table(ImageChops.logical_xor, 0, 1), (0, 255, 255, 0))
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self.assertEqual(
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table(ImageChops.logical_and, 0, 128), (0, 0, 0, 255))
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self.assertEqual(
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table(ImageChops.logical_or, 0, 128), (0, 255, 255, 255))
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self.assertEqual(
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table(ImageChops.logical_xor, 0, 128), (0, 255, 255, 0))
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self.assertEqual(
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table(ImageChops.logical_and, 0, 255), (0, 0, 0, 255))
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self.assertEqual(
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table(ImageChops.logical_or, 0, 255), (0, 255, 255, 255))
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self.assertEqual(
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table(ImageChops.logical_xor, 0, 255), (0, 255, 255, 0))
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