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883 lines
25 KiB
Python
883 lines
25 KiB
Python
from io import BytesIO
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import pytest
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from PIL import GifImagePlugin, Image, ImageDraw, ImagePalette, features
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from .helper import (
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assert_image_equal,
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assert_image_equal_tofile,
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assert_image_similar,
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hopper,
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is_pypy,
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netpbm_available,
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)
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# sample gif stream
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TEST_GIF = "Tests/images/hopper.gif"
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with open(TEST_GIF, "rb") as f:
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data = f.read()
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def test_sanity():
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with Image.open(TEST_GIF) as im:
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im.load()
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assert im.mode == "P"
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assert im.size == (128, 128)
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assert im.format == "GIF"
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assert im.info["version"] == b"GIF89a"
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@pytest.mark.skipif(is_pypy(), reason="Requires CPython")
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def test_unclosed_file():
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def open():
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im = Image.open(TEST_GIF)
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im.load()
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pytest.warns(ResourceWarning, open)
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def test_closed_file():
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with pytest.warns(None) as record:
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im = Image.open(TEST_GIF)
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im.load()
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im.close()
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assert not record
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def test_context_manager():
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with pytest.warns(None) as record:
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with Image.open(TEST_GIF) as im:
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im.load()
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assert not record
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def test_invalid_file():
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invalid_file = "Tests/images/flower.jpg"
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with pytest.raises(SyntaxError):
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GifImagePlugin.GifImageFile(invalid_file)
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def test_optimize():
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def test_grayscale(optimize):
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im = Image.new("L", (1, 1), 0)
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filename = BytesIO()
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im.save(filename, "GIF", optimize=optimize)
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return len(filename.getvalue())
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def test_bilevel(optimize):
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im = Image.new("1", (1, 1), 0)
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test_file = BytesIO()
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im.save(test_file, "GIF", optimize=optimize)
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return len(test_file.getvalue())
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assert test_grayscale(0) == 799
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assert test_grayscale(1) == 43
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assert test_bilevel(0) == 799
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assert test_bilevel(1) == 799
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def test_optimize_correctness():
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# 256 color Palette image, posterize to > 128 and < 128 levels
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# Size bigger and smaller than 512x512
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# Check the palette for number of colors allocated.
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# Check for correctness after conversion back to RGB
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def check(colors, size, expected_palette_length):
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# make an image with empty colors in the start of the palette range
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im = Image.frombytes(
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"P", (colors, colors), bytes(range(256 - colors, 256)) * colors
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)
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im = im.resize((size, size))
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outfile = BytesIO()
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im.save(outfile, "GIF")
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outfile.seek(0)
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with Image.open(outfile) as reloaded:
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# check palette length
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palette_length = max(i + 1 for i, v in enumerate(reloaded.histogram()) if v)
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assert expected_palette_length == palette_length
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assert_image_equal(im.convert("RGB"), reloaded.convert("RGB"))
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# These do optimize the palette
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check(128, 511, 128)
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check(64, 511, 64)
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check(4, 511, 4)
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# These don't optimize the palette
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check(128, 513, 256)
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check(64, 513, 256)
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check(4, 513, 256)
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# Other limits that don't optimize the palette
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check(129, 511, 256)
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check(255, 511, 256)
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check(256, 511, 256)
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def test_optimize_full_l():
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im = Image.frombytes("L", (16, 16), bytes(range(256)))
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test_file = BytesIO()
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im.save(test_file, "GIF", optimize=True)
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assert im.mode == "L"
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def test_roundtrip(tmp_path):
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out = str(tmp_path / "temp.gif")
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im = hopper()
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im.save(out)
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with Image.open(out) as reread:
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assert_image_similar(reread.convert("RGB"), im, 50)
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def test_roundtrip2(tmp_path):
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# see https://github.com/python-pillow/Pillow/issues/403
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out = str(tmp_path / "temp.gif")
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with Image.open(TEST_GIF) as im:
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im2 = im.copy()
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im2.save(out)
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with Image.open(out) as reread:
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assert_image_similar(reread.convert("RGB"), hopper(), 50)
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def test_roundtrip_save_all(tmp_path):
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# Single frame image
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out = str(tmp_path / "temp.gif")
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im = hopper()
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im.save(out, save_all=True)
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with Image.open(out) as reread:
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assert_image_similar(reread.convert("RGB"), im, 50)
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# Multiframe image
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with Image.open("Tests/images/dispose_bgnd.gif") as im:
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out = str(tmp_path / "temp.gif")
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im.save(out, save_all=True)
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with Image.open(out) as reread:
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assert reread.n_frames == 5
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def test_headers_saving_for_animated_gifs(tmp_path):
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important_headers = ["background", "version", "duration", "loop"]
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# Multiframe image
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with Image.open("Tests/images/dispose_bgnd.gif") as im:
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info = im.info.copy()
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out = str(tmp_path / "temp.gif")
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im.save(out, save_all=True)
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with Image.open(out) as reread:
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for header in important_headers:
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assert info[header] == reread.info[header]
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def test_palette_handling(tmp_path):
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# see https://github.com/python-pillow/Pillow/issues/513
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with Image.open(TEST_GIF) as im:
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im = im.convert("RGB")
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im = im.resize((100, 100), Image.LANCZOS)
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im2 = im.convert("P", palette=Image.ADAPTIVE, colors=256)
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f = str(tmp_path / "temp.gif")
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im2.save(f, optimize=True)
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with Image.open(f) as reloaded:
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assert_image_similar(im, reloaded.convert("RGB"), 10)
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def test_palette_434(tmp_path):
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# see https://github.com/python-pillow/Pillow/issues/434
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def roundtrip(im, *args, **kwargs):
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out = str(tmp_path / "temp.gif")
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im.copy().save(out, *args, **kwargs)
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reloaded = Image.open(out)
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return reloaded
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orig = "Tests/images/test.colors.gif"
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with Image.open(orig) as im:
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with roundtrip(im) as reloaded:
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assert_image_similar(im, reloaded, 1)
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with roundtrip(im, optimize=True) as reloaded:
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assert_image_similar(im, reloaded, 1)
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im = im.convert("RGB")
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# check automatic P conversion
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with roundtrip(im) as reloaded:
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reloaded = reloaded.convert("RGB")
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assert_image_equal(im, reloaded)
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@pytest.mark.skipif(not netpbm_available(), reason="Netpbm not available")
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def test_save_netpbm_bmp_mode(tmp_path):
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with Image.open(TEST_GIF) as img:
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img = img.convert("RGB")
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tempfile = str(tmp_path / "temp.gif")
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GifImagePlugin._save_netpbm(img, 0, tempfile)
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with Image.open(tempfile) as reloaded:
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assert_image_similar(img, reloaded.convert("RGB"), 0)
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@pytest.mark.skipif(not netpbm_available(), reason="Netpbm not available")
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def test_save_netpbm_l_mode(tmp_path):
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with Image.open(TEST_GIF) as img:
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img = img.convert("L")
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tempfile = str(tmp_path / "temp.gif")
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GifImagePlugin._save_netpbm(img, 0, tempfile)
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with Image.open(tempfile) as reloaded:
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assert_image_similar(img, reloaded.convert("L"), 0)
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def test_seek():
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with Image.open("Tests/images/dispose_none.gif") as img:
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frame_count = 0
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try:
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while True:
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frame_count += 1
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img.seek(img.tell() + 1)
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except EOFError:
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assert frame_count == 5
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def test_seek_info():
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with Image.open("Tests/images/iss634.gif") as im:
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info = im.info.copy()
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im.seek(1)
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im.seek(0)
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assert im.info == info
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def test_seek_rewind():
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with Image.open("Tests/images/iss634.gif") as im:
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im.seek(2)
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im.seek(1)
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with Image.open("Tests/images/iss634.gif") as expected:
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expected.seek(1)
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assert_image_equal(im, expected)
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def test_n_frames():
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for path, n_frames in [[TEST_GIF, 1], ["Tests/images/iss634.gif", 42]]:
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# Test is_animated before n_frames
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with Image.open(path) as im:
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assert im.is_animated == (n_frames != 1)
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# Test is_animated after n_frames
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with Image.open(path) as im:
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assert im.n_frames == n_frames
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assert im.is_animated == (n_frames != 1)
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def test_eoferror():
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with Image.open(TEST_GIF) as im:
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n_frames = im.n_frames
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# Test seeking past the last frame
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with pytest.raises(EOFError):
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im.seek(n_frames)
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assert im.tell() < n_frames
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# Test that seeking to the last frame does not raise an error
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im.seek(n_frames - 1)
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def test_dispose_none():
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with Image.open("Tests/images/dispose_none.gif") as img:
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try:
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while True:
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img.seek(img.tell() + 1)
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assert img.disposal_method == 1
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except EOFError:
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pass
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def test_dispose_none_load_end():
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# Test image created with:
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#
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# im = Image.open("transparent.gif")
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# im_rotated = im.rotate(180)
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# im.save("dispose_none_load_end.gif",
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# save_all=True, append_images=[im_rotated], disposal=[1,2])
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with Image.open("Tests/images/dispose_none_load_end.gif") as img:
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img.seek(1)
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assert_image_equal_tofile(img, "Tests/images/dispose_none_load_end_second.gif")
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def test_dispose_background():
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with Image.open("Tests/images/dispose_bgnd.gif") as img:
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try:
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while True:
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img.seek(img.tell() + 1)
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assert img.disposal_method == 2
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except EOFError:
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pass
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def test_dispose_previous():
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with Image.open("Tests/images/dispose_prev.gif") as img:
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try:
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while True:
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img.seek(img.tell() + 1)
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assert img.disposal_method == 3
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except EOFError:
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pass
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def test_dispose_previous_first_frame():
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with Image.open("Tests/images/dispose_prev_first_frame.gif") as im:
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im.seek(1)
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assert_image_equal_tofile(
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im, "Tests/images/dispose_prev_first_frame_seeked.gif"
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)
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def test_previous_frame_loaded():
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with Image.open("Tests/images/dispose_none.gif") as img:
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img.load()
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img.seek(1)
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img.load()
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img.seek(2)
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with Image.open("Tests/images/dispose_none.gif") as img_skipped:
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img_skipped.seek(2)
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assert_image_equal(img_skipped, img)
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def test_save_dispose(tmp_path):
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out = str(tmp_path / "temp.gif")
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im_list = [
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Image.new("L", (100, 100), "#000"),
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Image.new("L", (100, 100), "#111"),
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Image.new("L", (100, 100), "#222"),
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]
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for method in range(0, 4):
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im_list[0].save(out, save_all=True, append_images=im_list[1:], disposal=method)
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with Image.open(out) as img:
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for _ in range(2):
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img.seek(img.tell() + 1)
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assert img.disposal_method == method
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# Check per frame disposal
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im_list[0].save(
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out,
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save_all=True,
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append_images=im_list[1:],
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disposal=tuple(range(len(im_list))),
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)
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with Image.open(out) as img:
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for i in range(2):
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img.seek(img.tell() + 1)
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assert img.disposal_method == i + 1
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def test_dispose2_palette(tmp_path):
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out = str(tmp_path / "temp.gif")
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# 4 backgrounds: White, Grey, Black, Red
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circles = [(255, 255, 255), (153, 153, 153), (0, 0, 0), (255, 0, 0)]
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im_list = []
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for circle in circles:
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img = Image.new("RGB", (100, 100), (255, 0, 0))
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# Red circle in center of each frame
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d = ImageDraw.Draw(img)
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d.ellipse([(40, 40), (60, 60)], fill=circle)
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im_list.append(img)
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im_list[0].save(out, save_all=True, append_images=im_list[1:], disposal=2)
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with Image.open(out) as img:
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for i, circle in enumerate(circles):
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img.seek(i)
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rgb_img = img.convert("RGB")
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# Check top left pixel matches background
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assert rgb_img.getpixel((0, 0)) == (255, 0, 0)
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# Center remains red every frame
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assert rgb_img.getpixel((50, 50)) == circle
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def test_dispose2_diff(tmp_path):
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out = str(tmp_path / "temp.gif")
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# 4 frames: red/blue, red/red, blue/blue, red/blue
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circles = [
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((255, 0, 0, 255), (0, 0, 255, 255)),
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((255, 0, 0, 255), (255, 0, 0, 255)),
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((0, 0, 255, 255), (0, 0, 255, 255)),
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((255, 0, 0, 255), (0, 0, 255, 255)),
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]
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im_list = []
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for i in range(len(circles)):
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# Transparent BG
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img = Image.new("RGBA", (100, 100), (255, 255, 255, 0))
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# Two circles per frame
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d = ImageDraw.Draw(img)
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d.ellipse([(0, 30), (40, 70)], fill=circles[i][0])
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d.ellipse([(60, 30), (100, 70)], fill=circles[i][1])
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im_list.append(img)
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im_list[0].save(
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out, save_all=True, append_images=im_list[1:], disposal=2, transparency=0
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)
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with Image.open(out) as img:
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for i, colours in enumerate(circles):
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img.seek(i)
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rgb_img = img.convert("RGBA")
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# Check left circle is correct colour
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assert rgb_img.getpixel((20, 50)) == colours[0]
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# Check right circle is correct colour
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assert rgb_img.getpixel((80, 50)) == colours[1]
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# Check BG is correct colour
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assert rgb_img.getpixel((1, 1)) == (255, 255, 255, 0)
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def test_dispose2_background(tmp_path):
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out = str(tmp_path / "temp.gif")
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im_list = []
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im = Image.new("P", (100, 100))
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d = ImageDraw.Draw(im)
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d.rectangle([(50, 0), (100, 100)], fill="#f00")
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d.rectangle([(0, 0), (50, 100)], fill="#0f0")
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im_list.append(im)
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im = Image.new("P", (100, 100))
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d = ImageDraw.Draw(im)
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d.rectangle([(0, 0), (100, 50)], fill="#f00")
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d.rectangle([(0, 50), (100, 100)], fill="#0f0")
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im_list.append(im)
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im_list[0].save(
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out, save_all=True, append_images=im_list[1:], disposal=[0, 2], background=1
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)
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with Image.open(out) as im:
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im.seek(1)
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assert im.getpixel((0, 0)) == 0
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def test_transparency_in_second_frame():
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with Image.open("Tests/images/different_transparency.gif") as im:
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assert im.info["transparency"] == 0
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# Seek to the second frame
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im.seek(im.tell() + 1)
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assert im.info["transparency"] == 0
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assert_image_equal_tofile(im, "Tests/images/different_transparency_merged.gif")
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def test_no_transparency_in_second_frame():
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with Image.open("Tests/images/iss634.gif") as img:
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# Seek to the second frame
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img.seek(img.tell() + 1)
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assert "transparency" not in img.info
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# All transparent pixels should be replaced with the color from the first frame
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assert img.histogram()[255] == 0
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def test_duration(tmp_path):
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duration = 1000
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out = str(tmp_path / "temp.gif")
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im = Image.new("L", (100, 100), "#000")
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# Check that the argument has priority over the info settings
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im.info["duration"] = 100
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im.save(out, duration=duration)
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with Image.open(out) as reread:
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assert reread.info["duration"] == duration
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def test_multiple_duration(tmp_path):
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duration_list = [1000, 2000, 3000]
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out = str(tmp_path / "temp.gif")
|
|
im_list = [
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#111"),
|
|
Image.new("L", (100, 100), "#222"),
|
|
]
|
|
|
|
# Duration as list
|
|
im_list[0].save(
|
|
out, save_all=True, append_images=im_list[1:], duration=duration_list
|
|
)
|
|
with Image.open(out) as reread:
|
|
|
|
for duration in duration_list:
|
|
assert reread.info["duration"] == duration
|
|
try:
|
|
reread.seek(reread.tell() + 1)
|
|
except EOFError:
|
|
pass
|
|
|
|
# Duration as tuple
|
|
im_list[0].save(
|
|
out, save_all=True, append_images=im_list[1:], duration=tuple(duration_list)
|
|
)
|
|
with Image.open(out) as reread:
|
|
|
|
for duration in duration_list:
|
|
assert reread.info["duration"] == duration
|
|
try:
|
|
reread.seek(reread.tell() + 1)
|
|
except EOFError:
|
|
pass
|
|
|
|
|
|
def test_identical_frames(tmp_path):
|
|
duration_list = [1000, 1500, 2000, 4000]
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im_list = [
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#111"),
|
|
]
|
|
|
|
# Duration as list
|
|
im_list[0].save(
|
|
out, save_all=True, append_images=im_list[1:], duration=duration_list
|
|
)
|
|
with Image.open(out) as reread:
|
|
|
|
# Assert that the first three frames were combined
|
|
assert reread.n_frames == 2
|
|
|
|
# Assert that the new duration is the total of the identical frames
|
|
assert reread.info["duration"] == 4500
|
|
|
|
|
|
def test_identical_frames_to_single_frame(tmp_path):
|
|
for duration in ([1000, 1500, 2000, 4000], (1000, 1500, 2000, 4000), 8500):
|
|
out = str(tmp_path / "temp.gif")
|
|
im_list = [
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#000"),
|
|
Image.new("L", (100, 100), "#000"),
|
|
]
|
|
|
|
im_list[0].save(
|
|
out, save_all=True, append_images=im_list[1:], duration=duration
|
|
)
|
|
with Image.open(out) as reread:
|
|
# Assert that all frames were combined
|
|
assert reread.n_frames == 1
|
|
|
|
# Assert that the new duration is the total of the identical frames
|
|
assert reread.info["duration"] == 8500
|
|
|
|
|
|
def test_number_of_loops(tmp_path):
|
|
number_of_loops = 2
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im = Image.new("L", (100, 100), "#000")
|
|
im.save(out, loop=number_of_loops)
|
|
with Image.open(out) as reread:
|
|
|
|
assert reread.info["loop"] == number_of_loops
|
|
|
|
|
|
def test_background(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
im = Image.new("L", (100, 100), "#000")
|
|
im.info["background"] = 1
|
|
im.save(out)
|
|
with Image.open(out) as reread:
|
|
|
|
assert reread.info["background"] == im.info["background"]
|
|
|
|
if features.check("webp") and features.check("webp_anim"):
|
|
with Image.open("Tests/images/hopper.webp") as im:
|
|
assert isinstance(im.info["background"], tuple)
|
|
im.save(out)
|
|
|
|
|
|
def test_comment(tmp_path):
|
|
with Image.open(TEST_GIF) as im:
|
|
assert im.info["comment"] == b"File written by Adobe Photoshop\xa8 4.0"
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im = Image.new("L", (100, 100), "#000")
|
|
im.info["comment"] = b"Test comment text"
|
|
im.save(out)
|
|
with Image.open(out) as reread:
|
|
assert reread.info["comment"] == im.info["comment"]
|
|
|
|
im.info["comment"] = "Test comment text"
|
|
im.save(out)
|
|
with Image.open(out) as reread:
|
|
assert reread.info["comment"] == im.info["comment"].encode()
|
|
|
|
|
|
def test_comment_over_255(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
im = Image.new("L", (100, 100), "#000")
|
|
comment = b"Test comment text"
|
|
while len(comment) < 256:
|
|
comment += comment
|
|
im.info["comment"] = comment
|
|
im.save(out)
|
|
with Image.open(out) as reread:
|
|
|
|
assert reread.info["comment"] == comment
|
|
|
|
|
|
def test_zero_comment_subblocks():
|
|
with Image.open("Tests/images/hopper_zero_comment_subblocks.gif") as im:
|
|
assert_image_equal_tofile(im, TEST_GIF)
|
|
|
|
|
|
def test_version(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
|
|
def assertVersionAfterSave(im, version):
|
|
im.save(out)
|
|
with Image.open(out) as reread:
|
|
assert reread.info["version"] == version
|
|
|
|
# Test that GIF87a is used by default
|
|
im = Image.new("L", (100, 100), "#000")
|
|
assertVersionAfterSave(im, b"GIF87a")
|
|
|
|
# Test setting the version to 89a
|
|
im = Image.new("L", (100, 100), "#000")
|
|
im.info["version"] = b"89a"
|
|
assertVersionAfterSave(im, b"GIF89a")
|
|
|
|
# Test that adding a GIF89a feature changes the version
|
|
im.info["transparency"] = 1
|
|
assertVersionAfterSave(im, b"GIF89a")
|
|
|
|
# Test that a GIF87a image is also saved in that format
|
|
with Image.open("Tests/images/test.colors.gif") as im:
|
|
assertVersionAfterSave(im, b"GIF87a")
|
|
|
|
# Test that a GIF89a image is also saved in that format
|
|
im.info["version"] = b"GIF89a"
|
|
assertVersionAfterSave(im, b"GIF87a")
|
|
|
|
|
|
def test_append_images(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
|
|
# Test appending single frame images
|
|
im = Image.new("RGB", (100, 100), "#f00")
|
|
ims = [Image.new("RGB", (100, 100), color) for color in ["#0f0", "#00f"]]
|
|
im.copy().save(out, save_all=True, append_images=ims)
|
|
|
|
with Image.open(out) as reread:
|
|
assert reread.n_frames == 3
|
|
|
|
# Tests appending using a generator
|
|
def imGenerator(ims):
|
|
yield from ims
|
|
|
|
im.save(out, save_all=True, append_images=imGenerator(ims))
|
|
|
|
with Image.open(out) as reread:
|
|
assert reread.n_frames == 3
|
|
|
|
# Tests appending single and multiple frame images
|
|
with Image.open("Tests/images/dispose_none.gif") as im:
|
|
with Image.open("Tests/images/dispose_prev.gif") as im2:
|
|
im.save(out, save_all=True, append_images=[im2])
|
|
|
|
with Image.open(out) as reread:
|
|
assert reread.n_frames == 10
|
|
|
|
|
|
def test_transparent_optimize(tmp_path):
|
|
# From issue #2195, if the transparent color is incorrectly optimized out, GIF loses
|
|
# transparency.
|
|
# Need a palette that isn't using the 0 color, and one that's > 128 items where the
|
|
# transparent color is actually the top palette entry to trigger the bug.
|
|
|
|
data = bytes(range(1, 254))
|
|
palette = ImagePalette.ImagePalette("RGB", list(range(256)) * 3)
|
|
|
|
im = Image.new("L", (253, 1))
|
|
im.frombytes(data)
|
|
im.putpalette(palette)
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im.save(out, transparency=253)
|
|
with Image.open(out) as reloaded:
|
|
|
|
assert reloaded.info["transparency"] == 253
|
|
|
|
|
|
def test_rgb_transparency(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
|
|
# Single frame
|
|
im = Image.new("RGB", (1, 1))
|
|
im.info["transparency"] = (255, 0, 0)
|
|
im.save(out)
|
|
|
|
with Image.open(out) as reloaded:
|
|
assert "transparency" in reloaded.info
|
|
|
|
# Multiple frames
|
|
im = Image.new("RGB", (1, 1))
|
|
im.info["transparency"] = b""
|
|
ims = [Image.new("RGB", (1, 1))]
|
|
pytest.warns(UserWarning, im.save, out, save_all=True, append_images=ims)
|
|
|
|
with Image.open(out) as reloaded:
|
|
assert "transparency" not in reloaded.info
|
|
|
|
|
|
def test_bbox(tmp_path):
|
|
out = str(tmp_path / "temp.gif")
|
|
|
|
im = Image.new("RGB", (100, 100), "#fff")
|
|
ims = [Image.new("RGB", (100, 100), "#000")]
|
|
im.save(out, save_all=True, append_images=ims)
|
|
|
|
with Image.open(out) as reread:
|
|
assert reread.n_frames == 2
|
|
|
|
|
|
def test_palette_save_L(tmp_path):
|
|
# Generate an L mode image with a separate palette
|
|
|
|
im = hopper("P")
|
|
im_l = Image.frombytes("L", im.size, im.tobytes())
|
|
palette = bytes(im.getpalette())
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im_l.save(out, palette=palette)
|
|
|
|
with Image.open(out) as reloaded:
|
|
assert_image_equal(reloaded.convert("RGB"), im.convert("RGB"))
|
|
|
|
|
|
def test_palette_save_P(tmp_path):
|
|
# Pass in a different palette, then construct what the image would look like.
|
|
# Forcing a non-straight grayscale palette.
|
|
|
|
im = hopper("P")
|
|
palette = bytes([255 - i // 3 for i in range(768)])
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im.save(out, palette=palette)
|
|
|
|
with Image.open(out) as reloaded:
|
|
im.putpalette(palette)
|
|
assert_image_equal(reloaded, im)
|
|
|
|
|
|
def test_palette_save_ImagePalette(tmp_path):
|
|
# Pass in a different palette, as an ImagePalette.ImagePalette
|
|
# effectively the same as test_palette_save_P
|
|
|
|
im = hopper("P")
|
|
palette = ImagePalette.ImagePalette("RGB", list(range(256))[::-1] * 3)
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im.save(out, palette=palette)
|
|
|
|
with Image.open(out) as reloaded:
|
|
im.putpalette(palette)
|
|
assert_image_equal(reloaded, im)
|
|
|
|
|
|
def test_save_I(tmp_path):
|
|
# Test saving something that would trigger the auto-convert to 'L'
|
|
|
|
im = hopper("I")
|
|
|
|
out = str(tmp_path / "temp.gif")
|
|
im.save(out)
|
|
|
|
with Image.open(out) as reloaded:
|
|
assert_image_equal(reloaded.convert("L"), im.convert("L"))
|
|
|
|
|
|
def test_getdata():
|
|
# Test getheader/getdata against legacy values.
|
|
# Create a 'P' image with holes in the palette.
|
|
im = Image._wedge().resize((16, 16), Image.NEAREST)
|
|
im.putpalette(ImagePalette.ImagePalette("RGB"))
|
|
im.info = {"background": 0}
|
|
|
|
passed_palette = bytes([255 - i // 3 for i in range(768)])
|
|
|
|
GifImagePlugin._FORCE_OPTIMIZE = True
|
|
try:
|
|
h = GifImagePlugin.getheader(im, passed_palette)
|
|
d = GifImagePlugin.getdata(im)
|
|
|
|
import pickle
|
|
|
|
# Enable to get target values on pre-refactor version
|
|
# with open('Tests/images/gif_header_data.pkl', 'wb') as f:
|
|
# pickle.dump((h, d), f, 1)
|
|
with open("Tests/images/gif_header_data.pkl", "rb") as f:
|
|
(h_target, d_target) = pickle.load(f)
|
|
|
|
assert h == h_target
|
|
assert d == d_target
|
|
finally:
|
|
GifImagePlugin._FORCE_OPTIMIZE = False
|
|
|
|
|
|
def test_lzw_bits():
|
|
# see https://github.com/python-pillow/Pillow/issues/2811
|
|
with Image.open("Tests/images/issue_2811.gif") as im:
|
|
assert im.tile[0][3][0] == 11 # LZW bits
|
|
# codec error prepatch
|
|
im.load()
|
|
|
|
|
|
def test_extents():
|
|
with Image.open("Tests/images/test_extents.gif") as im:
|
|
assert im.size == (100, 100)
|
|
im.seek(1)
|
|
assert im.size == (150, 150)
|
|
|
|
|
|
def test_missing_background():
|
|
# The Global Color Table Flag isn't set, so there is no background color index,
|
|
# but the disposal method is "Restore to background color"
|
|
with Image.open("Tests/images/missing_background.gif") as im:
|
|
im.seek(1)
|
|
assert_image_equal_tofile(im, "Tests/images/missing_background_first_frame.gif")
|