Pillow/Tests/test_image_putpalette.py

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from __future__ import annotations
import pytest
from PIL import Image, ImagePalette
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from .helper import assert_image_equal, assert_image_equal_tofile, hopper
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def test_putpalette():
def palette(mode):
im = hopper(mode).copy()
im.putpalette(list(range(256)) * 3)
p = im.getpalette()
if p:
return im.mode, p[:10]
return im.mode
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with pytest.raises(ValueError):
palette("1")
for mode in ["L", "LA", "P", "PA"]:
assert palette(mode) == (
"PA" if "A" in mode else "P",
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
)
with pytest.raises(ValueError):
palette("I")
with pytest.raises(ValueError):
palette("F")
with pytest.raises(ValueError):
palette("RGB")
with pytest.raises(ValueError):
palette("RGBA")
with pytest.raises(ValueError):
palette("YCbCr")
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with Image.open("Tests/images/hopper_gray.jpg") as im:
assert im.mode == "L"
im.putpalette(list(range(256)) * 3)
with Image.open("Tests/images/la.tga") as im:
assert im.mode == "LA"
im.putpalette(list(range(256)) * 3)
def test_imagepalette():
im = hopper("P")
im.putpalette(ImagePalette.negative())
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assert_image_equal_tofile(im.convert("RGB"), "Tests/images/palette_negative.png")
im.putpalette(ImagePalette.random())
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im.putpalette(ImagePalette.sepia())
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assert_image_equal_tofile(im.convert("RGB"), "Tests/images/palette_sepia.png")
im.putpalette(ImagePalette.wedge())
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assert_image_equal_tofile(im.convert("RGB"), "Tests/images/palette_wedge.png")
def test_putpalette_with_alpha_values():
with Image.open("Tests/images/transparent.gif") as im:
expected = im.convert("RGBA")
palette = im.getpalette()
transparency = im.info.pop("transparency")
palette_with_alpha_values = []
for i in range(256):
color = palette[i * 3 : i * 3 + 3]
alpha = 0 if i == transparency else 255
palette_with_alpha_values += color + [alpha]
im.putpalette(palette_with_alpha_values, "RGBA")
assert_image_equal(im.convert("RGBA"), expected)
@pytest.mark.parametrize(
"mode, palette",
(
("RGBA", (1, 2, 3, 4)),
("RGBAX", (1, 2, 3, 4, 0)),
),
)
def test_rgba_palette(mode, palette):
im = Image.new("P", (1, 1))
im.putpalette(palette, mode)
assert im.getpalette() == [1, 2, 3]
assert im.palette.colors == {(1, 2, 3, 4): 0}
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def test_empty_palette():
im = Image.new("P", (1, 1))
assert im.getpalette() == []
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def test_undefined_palette_index():
im = Image.new("P", (1, 1), 3)
im.putpalette((1, 2, 3))
assert im.convert("RGB").getpixel((0, 0)) == (0, 0, 0)