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151 lines
3.2 KiB
Python
151 lines
3.2 KiB
Python
import pytest
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from PIL import Image, ImagePalette
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from .helper import assert_image_equal
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def test_sanity():
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ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
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with pytest.raises(ValueError):
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ImagePalette.ImagePalette("RGB", list(range(256)) * 2)
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def test_getcolor():
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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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assert len(test_map) == 256
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with pytest.raises(ValueError):
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palette.getcolor((1, 2, 3))
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# Test unknown color specifier
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with pytest.raises(ValueError):
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palette.getcolor("unknown")
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def test_file(tmp_path):
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palette = ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
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f = str(tmp_path / "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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assert len(p[0]) == 768
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assert p[1] == "RGB"
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p = ImagePalette.raw(p[1], p[0])
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assert isinstance(p, ImagePalette.ImagePalette)
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assert p.palette == palette.tobytes()
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def test_make_linear_lut():
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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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assert isinstance(lut, list)
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assert len(lut) == 256
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# Check values
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for i in range(0, len(lut)):
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assert lut[i] == i
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def test_make_linear_lut_not_yet_implemented():
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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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with pytest.raises(NotImplementedError):
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ImagePalette.make_linear_lut(black, white)
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def test_make_gamma_lut():
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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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assert isinstance(lut, list)
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assert len(lut) == 256
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# Check a few values
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assert lut[0] == 0
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assert lut[63] == 0
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assert lut[127] == 8
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assert lut[191] == 60
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assert lut[255] == 255
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def test_rawmode_valueerrors(tmp_path):
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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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with pytest.raises(ValueError):
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palette.tobytes()
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with pytest.raises(ValueError):
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palette.getcolor((1, 2, 3))
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f = str(tmp_path / "temp.lut")
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with pytest.raises(ValueError):
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palette.save(f)
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def test_getdata():
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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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assert mode == "RGB;L"
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def test_rawmode_getdata():
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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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assert rawmode == "RGB"
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assert data_in == data_out
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def test_2bit_palette(tmp_path):
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# issue #2258, 2 bit palettes are corrupted.
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outfile = str(tmp_path / "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():
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with pytest.raises(OSError):
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ImagePalette.load("Tests/images/hopper.jpg")
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