import pytest from .helper import assert_image_equal, hopper def test_sanity(): 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 + 1) with pytest.raises(TypeError): im.point(lambda x: x - 1) with pytest.raises(TypeError): im.point(lambda x: x / 1) def test_16bit_lut(): """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(): """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(): im = hopper("F") with pytest.raises(ValueError): im.point(None)