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import pytest
from PIL import Image, ImagePalette
from .helper import assert_image_equal, hopper
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
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")
def test_imagepalette():
im = hopper("P")
im.putpalette(ImagePalette.negative())
im.putpalette(ImagePalette.random())
im.putpalette(ImagePalette.sepia())
im.putpalette(ImagePalette.wedge())
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)
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