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49 lines
1.2 KiB
Python
49 lines
1.2 KiB
Python
import pytest
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from .helper import assert_image_equal, hopper
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def test_sanity():
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im = hopper()
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with pytest.raises(ValueError):
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im.point(list(range(256)))
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im.point(list(range(256)) * 3)
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im.point(lambda x: x)
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im = im.convert("I")
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with pytest.raises(ValueError):
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im.point(list(range(256)))
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im.point(lambda x: x * 1)
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im.point(lambda x: x + 1)
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im.point(lambda x: x * 1 + 1)
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with pytest.raises(TypeError):
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im.point(lambda x: x - 1)
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with pytest.raises(TypeError):
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im.point(lambda x: x / 1)
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def test_16bit_lut():
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""" Tests for 16 bit -> 8 bit lut for converting I->L images
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see https://github.com/python-pillow/Pillow/issues/440
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"""
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im = hopper("I")
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im.point(list(range(256)) * 256, "L")
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def test_f_lut():
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""" Tests for floating point lut of 8bit gray image """
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im = hopper("L")
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lut = [0.5 * float(x) for x in range(256)]
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out = im.point(lut, "F")
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int_lut = [x // 2 for x in range(256)]
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assert_image_equal(out.convert("L"), im.point(int_lut, "L"))
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def test_f_mode():
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im = hopper("F")
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with pytest.raises(ValueError):
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im.point(None)
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