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158 lines
4.5 KiB
Python
158 lines
4.5 KiB
Python
from __future__ import annotations
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import pytest
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from packaging.version import parse as parse_version
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from PIL import Image, features
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from .helper import assert_image_similar, hopper, is_ppc64le, skip_unless_feature
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def test_sanity() -> None:
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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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@skip_unless_feature("libimagequant")
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def test_libimagequant_quantize() -> None:
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image = hopper()
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if is_ppc64le():
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version = features.version_feature("libimagequant")
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assert version is not None
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if parse_version(version) < parse_version("4"):
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pytest.skip("Fails with libimagequant earlier than 4.0.0 on ppc64le")
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converted = image.quantize(100, Image.Quantize.LIBIMAGEQUANT)
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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() -> None:
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image = hopper()
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converted = image.quantize(100, Image.Quantize.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() -> None:
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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() -> None:
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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() -> None:
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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=Image.Dither.NONE, 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_no_dither2() -> None:
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im = Image.new("RGB", (9, 1))
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im.putdata([(p,) * 3 for p in range(0, 36, 4)])
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palette = Image.new("P", (1, 1))
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data = (0, 0, 0, 32, 32, 32)
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palette.putpalette(data)
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quantized = im.quantize(dither=Image.Dither.NONE, palette=palette)
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assert tuple(quantized.palette.palette) == data
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px = quantized.load()
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for x in range(9):
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assert px[x, 0] == (0 if x < 5 else 1)
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def test_quantize_dither_diff() -> None:
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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=Image.Dither.FLOYDSTEINBERG, palette=palette)
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nodither = image.quantize(dither=Image.Dither.NONE, palette=palette)
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assert dither.tobytes() != nodither.tobytes()
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@pytest.mark.parametrize(
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"method", (Image.Quantize.MEDIANCUT, Image.Quantize.MAXCOVERAGE)
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)
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def test_quantize_kmeans(method: Image.Quantize) -> None:
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im = hopper()
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no_kmeans = im.quantize(kmeans=0, method=method)
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kmeans = im.quantize(kmeans=1, method=method)
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assert kmeans.tobytes() != no_kmeans.tobytes()
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with pytest.raises(ValueError):
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im.quantize(kmeans=-1, method=method)
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def test_colors() -> None:
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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() -> None:
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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.Quantize.MEDIANCUT, (0, 0, 0)),
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(Image.Quantize.MAXCOVERAGE, (0, 0, 0)),
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(Image.Quantize.FASTOCTREE, (0, 0, 0)),
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(Image.Quantize.FASTOCTREE, (0, 0, 0, 0)),
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),
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)
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def test_palette(method: Image.Quantize, color: tuple[int, ...]) -> None:
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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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def test_small_palette() -> None:
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# Arrange
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im = hopper()
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colors = (255, 0, 0, 0, 0, 255)
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p = Image.new("P", (1, 1))
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p.putpalette(colors)
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# Act
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im = im.quantize(palette=p)
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# Assert
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assert len(im.getcolors()) == 2
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