import pytest from PIL import Image, ImageFilter sample = Image.new("L", (7, 5)) # fmt: off sample.putdata(sum([ [210, 50, 20, 10, 220, 230, 80], [190, 210, 20, 180, 170, 40, 110], [120, 210, 250, 60, 220, 0, 220], [220, 40, 230, 80, 130, 250, 40], [250, 0, 80, 30, 60, 20, 110], ], [])) # fmt: on def test_imageops_box_blur(): i = sample.filter(ImageFilter.BoxBlur(1)) assert i.mode == sample.mode assert i.size == sample.size assert isinstance(i, Image.Image) def box_blur(image, radius=1, n=1): return image._new(image.im.box_blur(radius, n)) def assert_image(im, data, delta=0): it = iter(im.getdata()) for data_row in data: im_row = [next(it) for _ in range(im.size[0])] if any(abs(data_v - im_v) > delta for data_v, im_v in zip(data_row, im_row)): assert im_row == data_row with pytest.raises(StopIteration): next(it) def assert_blur(im, radius, data, passes=1, delta=0): # check grayscale image assert_image(box_blur(im, radius, passes), data, delta) rgba = Image.merge("RGBA", (im, im, im, im)) for band in box_blur(rgba, radius, passes).split(): assert_image(band, data, delta) def test_color_modes(): with pytest.raises(ValueError): box_blur(sample.convert("1")) with pytest.raises(ValueError): box_blur(sample.convert("P")) box_blur(sample.convert("L")) box_blur(sample.convert("LA")) box_blur(sample.convert("LA").convert("La")) with pytest.raises(ValueError): box_blur(sample.convert("I")) with pytest.raises(ValueError): box_blur(sample.convert("F")) box_blur(sample.convert("RGB")) box_blur(sample.convert("RGBA")) box_blur(sample.convert("RGBA").convert("RGBa")) box_blur(sample.convert("CMYK")) with pytest.raises(ValueError): box_blur(sample.convert("YCbCr")) def test_radius_0(): assert_blur( sample, 0, [ # fmt: off [210, 50, 20, 10, 220, 230, 80], [190, 210, 20, 180, 170, 40, 110], [120, 210, 250, 60, 220, 0, 220], [220, 40, 230, 80, 130, 250, 40], [250, 0, 80, 30, 60, 20, 110], # fmt: on ], ) def test_radius_0_02(): assert_blur( sample, 0.02, [ # fmt: off [206, 55, 20, 17, 215, 223, 83], [189, 203, 31, 171, 169, 46, 110], [125, 206, 241, 69, 210, 13, 210], [215, 49, 221, 82, 131, 235, 48], [244, 7, 80, 32, 60, 27, 107], # fmt: on ], delta=2, ) def test_radius_0_05(): assert_blur( sample, 0.05, [ # fmt: off [202, 62, 22, 27, 209, 215, 88], [188, 194, 44, 161, 168, 56, 111], [131, 201, 229, 81, 198, 31, 198], [209, 62, 209, 86, 133, 216, 59], [237, 17, 80, 36, 60, 35, 103], # fmt: on ], delta=2, ) def test_radius_0_1(): assert_blur( sample, 0.1, [ # fmt: off [196, 72, 24, 40, 200, 203, 93], [187, 183, 62, 148, 166, 68, 111], [139, 193, 213, 96, 182, 54, 182], [201, 78, 193, 91, 133, 191, 73], [227, 31, 80, 42, 61, 47, 99], # fmt: on ], delta=1, ) def test_radius_0_5(): assert_blur( sample, 0.5, [ # fmt: off [176, 101, 46, 83, 163, 165, 111], [176, 149, 108, 122, 144, 120, 117], [164, 171, 159, 141, 134, 119, 129], [170, 136, 133, 114, 116, 124, 109], [184, 95, 72, 70, 69, 81, 89], # fmt: on ], delta=1, ) def test_radius_1(): assert_blur( sample, 1, [ # fmt: off [170, 109, 63, 97, 146, 153, 116], [168, 142, 112, 128, 126, 143, 121], [169, 166, 142, 149, 126, 131, 114], [159, 156, 109, 127, 94, 117, 112], [164, 128, 63, 87, 76, 89, 90], # fmt: on ], delta=1, ) def test_radius_1_5(): assert_blur( sample, 1.5, [ # fmt: off [155, 120, 105, 112, 124, 137, 130], [160, 136, 124, 125, 127, 134, 130], [166, 147, 130, 125, 120, 121, 119], [168, 145, 119, 109, 103, 105, 110], [168, 134, 96, 85, 85, 89, 97], # fmt: on ], delta=1, ) def test_radius_bigger_then_half(): assert_blur( sample, 3, [ # fmt: off [144, 145, 142, 128, 114, 115, 117], [148, 145, 137, 122, 109, 111, 112], [152, 145, 131, 117, 103, 107, 108], [156, 144, 126, 111, 97, 102, 103], [160, 144, 121, 106, 92, 98, 99], # fmt: on ], delta=1, ) def test_radius_bigger_then_width(): assert_blur( sample, 10, [ [158, 153, 147, 141, 135, 129, 123], [159, 153, 147, 141, 136, 130, 124], [159, 154, 148, 142, 136, 130, 124], [160, 154, 148, 142, 137, 131, 125], [160, 155, 149, 143, 137, 131, 125], ], delta=0, ) def test_extreme_large_radius(): assert_blur( sample, 600, [ [162, 162, 162, 162, 162, 162, 162], [162, 162, 162, 162, 162, 162, 162], [162, 162, 162, 162, 162, 162, 162], [162, 162, 162, 162, 162, 162, 162], [162, 162, 162, 162, 162, 162, 162], ], delta=1, ) def test_two_passes(): assert_blur( sample, 1, [ # fmt: off [153, 123, 102, 109, 132, 135, 129], [159, 138, 123, 121, 133, 131, 126], [162, 147, 136, 124, 127, 121, 121], [159, 140, 125, 108, 111, 106, 108], [154, 126, 105, 87, 94, 93, 97], # fmt: on ], passes=2, delta=1, ) def test_three_passes(): assert_blur( sample, 1, [ # fmt: off [146, 131, 116, 118, 126, 131, 130], [151, 138, 125, 123, 126, 128, 127], [154, 143, 129, 123, 120, 120, 119], [152, 139, 122, 113, 108, 108, 108], [148, 132, 112, 102, 97, 99, 100], # fmt: on ], passes=3, delta=1, )