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d50445ff30
Similar to the recent adoption of Black. isort is a Python utility to sort imports alphabetically and automatically separate into sections. By using isort, contributors can quickly and automatically conform to the projects style without thinking. Just let the tool do it. Uses the configuration recommended by the Black to avoid conflicts of style. Rewrite TestImageQt.test_deprecated to no rely on import order.
137 lines
3.7 KiB
Python
137 lines
3.7 KiB
Python
from PIL import Image, ImagePalette
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from .helper import PillowTestCase
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class TestImagePalette(PillowTestCase):
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def test_sanity(self):
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ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
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self.assertRaises(
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ValueError, ImagePalette.ImagePalette, "RGB", list(range(256)) * 2
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)
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def test_getcolor(self):
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palette = ImagePalette.ImagePalette()
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test_map = {}
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for i in range(256):
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test_map[palette.getcolor((i, i, i))] = i
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self.assertEqual(len(test_map), 256)
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self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
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# Test unknown color specifier
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self.assertRaises(ValueError, palette.getcolor, "unknown")
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def test_file(self):
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palette = ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
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f = self.tempfile("temp.lut")
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palette.save(f)
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p = ImagePalette.load(f)
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# load returns raw palette information
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self.assertEqual(len(p[0]), 768)
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self.assertEqual(p[1], "RGB")
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p = ImagePalette.raw(p[1], p[0])
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self.assertIsInstance(p, ImagePalette.ImagePalette)
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self.assertEqual(p.palette, palette.tobytes())
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def test_make_linear_lut(self):
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# Arrange
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black = 0
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white = 255
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# Act
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lut = ImagePalette.make_linear_lut(black, white)
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# Assert
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self.assertIsInstance(lut, list)
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self.assertEqual(len(lut), 256)
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# Check values
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for i in range(0, len(lut)):
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self.assertEqual(lut[i], i)
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def test_make_linear_lut_not_yet_implemented(self):
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# Update after FIXME
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# Arrange
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black = 1
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white = 255
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# Act
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self.assertRaises(
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NotImplementedError, ImagePalette.make_linear_lut, black, white
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)
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def test_make_gamma_lut(self):
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# Arrange
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exp = 5
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# Act
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lut = ImagePalette.make_gamma_lut(exp)
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# Assert
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self.assertIsInstance(lut, list)
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self.assertEqual(len(lut), 256)
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# Check a few values
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self.assertEqual(lut[0], 0)
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self.assertEqual(lut[63], 0)
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self.assertEqual(lut[127], 8)
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self.assertEqual(lut[191], 60)
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self.assertEqual(lut[255], 255)
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def test_rawmode_valueerrors(self):
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# Arrange
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palette = ImagePalette.raw("RGB", list(range(256)) * 3)
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# Act / Assert
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self.assertRaises(ValueError, palette.tobytes)
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self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
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f = self.tempfile("temp.lut")
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self.assertRaises(ValueError, palette.save, f)
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def test_getdata(self):
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# Arrange
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data_in = list(range(256)) * 3
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palette = ImagePalette.ImagePalette("RGB", data_in)
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# Act
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mode, data_out = palette.getdata()
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# Assert
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self.assertEqual(mode, "RGB;L")
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def test_rawmode_getdata(self):
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# Arrange
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data_in = list(range(256)) * 3
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palette = ImagePalette.raw("RGB", data_in)
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# Act
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rawmode, data_out = palette.getdata()
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# Assert
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self.assertEqual(rawmode, "RGB")
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self.assertEqual(data_in, data_out)
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def test_2bit_palette(self):
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# issue #2258, 2 bit palettes are corrupted.
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outfile = self.tempfile("temp.png")
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rgb = b"\x00" * 2 + b"\x01" * 2 + b"\x02" * 2
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img = Image.frombytes("P", (6, 1), rgb)
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img.putpalette(b"\xFF\x00\x00\x00\xFF\x00\x00\x00\xFF") # RGB
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img.save(outfile, format="PNG")
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reloaded = Image.open(outfile)
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self.assert_image_equal(img, reloaded)
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def test_invalid_palette(self):
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self.assertRaises(IOError, ImagePalette.load, "Tests/images/hopper.jpg")
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