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65 lines
1.9 KiB
Python
65 lines
1.9 KiB
Python
import pytest
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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():
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def palette(mode):
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im = hopper(mode).copy()
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im.putpalette(list(range(256)) * 3)
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p = im.getpalette()
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if p:
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return im.mode, p[:10]
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return im.mode
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with pytest.raises(ValueError):
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palette("1")
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for mode in ["L", "LA", "P", "PA"]:
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assert palette(mode) == (
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"PA" if "A" in mode else "P",
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
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)
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with pytest.raises(ValueError):
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palette("I")
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with pytest.raises(ValueError):
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palette("F")
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with pytest.raises(ValueError):
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palette("RGB")
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with pytest.raises(ValueError):
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palette("RGBA")
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with pytest.raises(ValueError):
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palette("YCbCr")
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def test_imagepalette():
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im = hopper("P")
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im.putpalette(ImagePalette.negative())
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assert_image_equal_tofile(im.convert("RGB"), "Tests/images/palette_negative.png")
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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")
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im.putpalette(ImagePalette.wedge())
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assert_image_equal_tofile(im.convert("RGB"), "Tests/images/palette_wedge.png")
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def test_putpalette_with_alpha_values():
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with Image.open("Tests/images/transparent.gif") as im:
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expected = im.convert("RGBA")
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palette = im.getpalette()
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transparency = im.info.pop("transparency")
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palette_with_alpha_values = []
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for i in range(256):
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color = palette[i * 3 : i * 3 + 3]
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alpha = 0 if i == transparency else 255
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palette_with_alpha_values += color + [alpha]
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im.putpalette(palette_with_alpha_values, "RGBA")
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assert_image_equal(im.convert("RGBA"), expected)
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