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112 lines
3.1 KiB
Python
112 lines
3.1 KiB
Python
import pytest
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from PIL import Image
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from .helper import assert_image_similar, hopper, is_ppc64le
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def test_sanity():
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image = hopper()
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converted = image.quantize()
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assert converted.mode == "P"
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assert_image_similar(converted.convert("RGB"), image, 10)
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image = hopper()
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converted = image.quantize(palette=hopper("P"))
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assert converted.mode == "P"
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assert_image_similar(converted.convert("RGB"), image, 60)
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@pytest.mark.xfail(is_ppc64le(), reason="failing on ppc64le on GHA")
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def test_libimagequant_quantize():
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image = hopper()
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try:
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converted = image.quantize(100, Image.LIBIMAGEQUANT)
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except ValueError as ex: # pragma: no cover
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if "dependency" in str(ex).lower():
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pytest.skip("libimagequant support not available")
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else:
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raise
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assert converted.mode == "P"
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assert_image_similar(converted.convert("RGB"), image, 15)
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assert len(converted.getcolors()) == 100
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def test_octree_quantize():
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image = hopper()
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converted = image.quantize(100, Image.FASTOCTREE)
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assert converted.mode == "P"
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assert_image_similar(converted.convert("RGB"), image, 20)
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assert len(converted.getcolors()) == 100
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def test_rgba_quantize():
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image = hopper("RGBA")
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with pytest.raises(ValueError):
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image.quantize(method=0)
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assert image.quantize().convert().mode == "RGBA"
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def test_quantize():
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with Image.open("Tests/images/caption_6_33_22.png") as image:
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image = image.convert("RGB")
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converted = image.quantize()
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assert converted.mode == "P"
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assert_image_similar(converted.convert("RGB"), image, 1)
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def test_quantize_no_dither():
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image = hopper()
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with Image.open("Tests/images/caption_6_33_22.png") as palette:
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palette = palette.convert("P")
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converted = image.quantize(dither=0, palette=palette)
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assert converted.mode == "P"
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assert converted.palette.palette == palette.palette.palette
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def test_quantize_dither_diff():
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image = hopper()
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with Image.open("Tests/images/caption_6_33_22.png") as palette:
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palette = palette.convert("P")
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dither = image.quantize(dither=1, palette=palette)
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nodither = image.quantize(dither=0, palette=palette)
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assert dither.tobytes() != nodither.tobytes()
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def test_colors():
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im = hopper()
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colors = 2
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converted = im.quantize(colors)
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assert len(converted.palette.palette) == colors * len("RGB")
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def test_transparent_colors_equal():
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im = Image.new("RGBA", (1, 2), (0, 0, 0, 0))
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px = im.load()
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px[0, 1] = (255, 255, 255, 0)
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converted = im.quantize()
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converted_px = converted.load()
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assert converted_px[0, 0] == converted_px[0, 1]
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@pytest.mark.parametrize(
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"method, color",
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(
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(Image.MEDIANCUT, (0, 0, 0)),
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(Image.MAXCOVERAGE, (0, 0, 0)),
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(Image.FASTOCTREE, (0, 0, 0)),
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(Image.FASTOCTREE, (0, 0, 0, 0)),
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),
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)
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def test_palette(method, color):
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im = Image.new("RGBA" if len(color) == 4 else "RGB", (1, 1), color)
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converted = im.quantize(method=method)
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converted_px = converted.load()
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assert converted_px[0, 0] == converted.palette.colors[color]
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