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Match mask size to pasted image size in GifImagePlugin #7779

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merged 1 commit into from Mar 1, 2024
Merged

Match mask size to pasted image size in GifImagePlugin #7779

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15 changes: 15 additions & 0 deletions Tests/test_file_gif.py
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Expand Up @@ -1105,6 +1105,21 @@ def im_generator(ims):
assert reread.n_frames == 10


def test_append_different_size_image(tmp_path: Path) -> None:
out = str(tmp_path / "temp.gif")

im = Image.new("RGB", (100, 100))
bigger_im = Image.new("RGB", (200, 200), "#f00")

im.save(out, save_all=True, append_images=[bigger_im])

with Image.open(out) as reread:
assert reread.size == (100, 100)

reread.seek(1)
assert reread.size == (100, 100)


def test_transparent_optimize(tmp_path: Path) -> None:
# From issue #2195, if the transparent color is incorrectly optimized out, GIF loses
# transparency.
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4 changes: 1 addition & 3 deletions src/PIL/GifImagePlugin.py
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Expand Up @@ -649,9 +649,7 @@ def _write_multiple_frames(im, fp, palette):
if "transparency" in encoderinfo:
# When the delta is zero, fill the image with transparency
diff_frame = im_frame.copy()
fill = Image.new(
"P", diff_frame.size, encoderinfo["transparency"]
)
fill = Image.new("P", delta.size, encoderinfo["transparency"])
if delta.mode == "RGBA":
r, g, b, a = delta.split()
mask = ImageMath.eval(
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