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Use transparency when combining P frames

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This commit is contained in:
Andrew Murray 2024-10-06 11:30:27 +11:00
parent 01bb78a8e7
commit b77cd009e2
2 changed files with 8 additions and 2 deletions
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4
Tests/test_file_apng.py
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@ -258,8 +258,8 @@ def test_apng_mode() -> None:
assert im.mode == "P"
im.seek(im.n_frames - 1)
im = im.convert("RGBA")
assert im.getpixel((0, 0)) == (255, 0, 0, 0)
assert im.getpixel((64, 32)) == (255, 0, 0, 0)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
with Image.open("Tests/images/apng/mode_palette_1bit_alpha.png") as im:
assert im.mode == "P"

6
src/PIL/PngImagePlugin.py
View File

@ -1063,6 +1063,12 @@ class PngImageFile(ImageFile.ImageFile):
"RGBA", self.info["transparency"]
)
else:
if self.im.mode == "P" and "transparency" in self.info:
t = self.info["transparency"]
if isinstance(t, bytes):
updated.putpalettealphas(t)
elif isinstance(t, int):
updated.putpalettealpha(t)
mask = updated.convert("RGBA")
self._prev_im.paste(updated, self.dispose_extent, mask)
self.im = self._prev_im