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Fixed pasting an L frame onto an RGB(A) GIF

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This commit is contained in:
Andrew Murray 2022-09-14 00:05:23 +10:00
parent 53664c5f69
commit ae6520ccd6
3 changed files with 15 additions and 9 deletions
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Tests/images/no_palette_after_rgb.gif Normal file
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9
Tests/test_file_gif.py
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@ -83,6 +83,15 @@ def test_l_mode_transparency():
assert im.load()[0, 0] == 128 assert im.load()[0, 0] == 128
def test_l_mode_after_rgb():
with Image.open("Tests/images/no_palette_after_rgb.gif") as im:
im.seek(1)
assert im.mode == "RGB"
im.seek(2)
assert im.mode == "RGB"
def test_strategy(): def test_strategy():
with Image.open("Tests/images/chi.gif") as im: with Image.open("Tests/images/chi.gif") as im:
expected_zero = im.convert("RGB") expected_zero = im.convert("RGB")

15
src/PIL/GifImagePlugin.py
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@ -432,16 +432,13 @@ class GifImageFile(ImageFile.ImageFile):
self.mode = "RGB" self.mode = "RGB"
self.im = self.im.convert("RGB", Image.Dither.FLOYDSTEINBERG) self.im = self.im.convert("RGB", Image.Dither.FLOYDSTEINBERG)
return return
if self.mode == "P" and self._prev_im: if not self._prev_im:
if self._frame_transparency is not None: return
self.im.putpalettealpha(self._frame_transparency, 0) if self._frame_transparency is not None:
frame_im = self.im.convert("RGBA") self.im.putpalettealpha(self._frame_transparency, 0)
else: frame_im = self.im.convert("RGBA")
frame_im = self.im.convert("RGB")
else: else:
if not self._prev_im: frame_im = self.im.convert("RGB")
return
frame_im = self.im
frame_im = self._crop(frame_im, self.dispose_extent) frame_im = self._crop(frame_im, self.dispose_extent)
self.im = self._prev_im self.im = self._prev_im