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from __future__ import annotations
import pytest
from .helper import assert_image_equal, hopper
def test_sanity() -> None:
im = hopper()
with pytest.raises(ValueError):
im.point(list(range(256)))
im.point(list(range(256)) * 3)
im.point(lambda x: x)
im.point(lambda x: x * 1.2)
im = im.convert("I")
with pytest.raises(ValueError):
im.point(list(range(256)))
im.point(lambda x: x * 1)
im.point(lambda x: x + 1)
im.point(lambda x: x - 1)
im.point(lambda x: x * 1 + 1)
im.point(lambda x: 0.1 + 0.2 * x)
im.point(lambda x: -x)
im.point(lambda x: x - 0.5)
im.point(lambda x: 1 - x / 2)
im.point(lambda x: (2 + x) / 3)
im.point(lambda x: 0.5)
im.point(lambda x: x / 1)
im.point(lambda x: x + x)
with pytest.raises(TypeError):
im.point(lambda x: x * x)
with pytest.raises(TypeError):
im.point(lambda x: x / x)
with pytest.raises(TypeError):
im.point(lambda x: 1 / x)
with pytest.raises(TypeError):
im.point(lambda x: x // 2)
def test_16bit_lut() -> None:
"""Tests for 16 bit -> 8 bit lut for converting I->L images
see https://github.com/python-pillow/Pillow/issues/440
"""
im = hopper("I")
im.point(list(range(256)) * 256, "L")
def test_f_lut() -> None:
"""Tests for floating point lut of 8bit gray image"""
im = hopper("L")
lut = [0.5 * float(x) for x in range(256)]
out = im.point(lut, "F")
int_lut = [x // 2 for x in range(256)]
assert_image_equal(out.convert("L"), im.point(int_lut, "L"))
def test_f_mode() -> None:
im = hopper("F")
with pytest.raises(ValueError):
im.point([])
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