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Convert subsequent frames of L mode GIF to LA if transparency is present

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This commit is contained in:
Andrew Murray 2022-03-01 20:11:35 +11:00
parent 37d28ce514
commit 5c6212052c
3 changed files with 25 additions and 5 deletions
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Tests/images/no_palette_with_transparency.gif Normal file
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11
Tests/test_file_gif.py
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@ -59,6 +59,17 @@ def test_invalid_file():
GifImagePlugin.GifImageFile(invalid_file)
def test_l_mode_transparency():
with Image.open("Tests/images/no_palette_with_transparency.gif") as im:
assert im.mode == "L"
assert im.load()[0, 0] == 0
assert im.info["transparency"] == 255
im.seek(1)
assert im.mode == "LA"
assert im.load()[0, 0] == (0, 255)
def test_optimize():
def test_grayscale(optimize):
im = Image.new("L", (1, 1), 0)

19
src/PIL/GifImagePlugin.py
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@ -167,9 +167,15 @@ class GifImageFile(ImageFile.ImageFile):
if self.__frame == 1:
self.pyaccess = None
if "transparency" in self.info:
self.mode = "RGBA"
self.im.putpalettealpha(self.info["transparency"], 0)
self.im = self.im.convert("RGBA", Image.Dither.FLOYDSTEINBERG)
if self.mode == "P":
self.im.putpalettealpha(self.info["transparency"], 0)
self.im = self.im.convert("RGBA", Image.Dither.FLOYDSTEINBERG)
self.mode = "RGBA"
else:
self.im = self.im.convert_transparent(
"LA", self.info["transparency"]
)
self.mode = "LA"
del self.info["transparency"]
else:
@ -368,8 +374,11 @@ class GifImageFile(ImageFile.ImageFile):
if self.__frame == 0:
return
if self._frame_transparency is not None:
self.im.putpalettealpha(self._frame_transparency, 0)
frame_im = self.im.convert("RGBA")
if self.mode == "P":
self.im.putpalettealpha(self._frame_transparency, 0)
frame_im = self.im.convert("RGBA")
else:
frame_im = self.im.convert_transparent("LA", self._frame_transparency)
else:
frame_im = self.im.convert("RGB")
frame_im = self._crop(frame_im, self.dispose_extent)