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136 lines
3.7 KiB
Python
136 lines
3.7 KiB
Python
from PIL import Image, ImagePalette
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from .helper import PillowTestCase, assert_image_equal
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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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with Image.open(outfile) as reloaded:
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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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