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Expand GIF core image during seek() #10356

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Expand GIF core image during seek() #10356

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2 changes: 0 additions & 2 deletions Tests/test_file_gif.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1478,8 +1478,6 @@ def test_extents(

im.seek(1)
assert im.size == (150, 150)

im.load()
assert im.im.size == (150, 150)


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15 changes: 8 additions & 7 deletions src/PIL/GifImagePlugin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,14 @@ def _seek(self, frame: int, update_image: bool = True) -> None:
size = max(x1, self.size[0]), max(y1, self.size[1])
Image._decompression_bomb_check(size)
self._size = size

if self._im is not None and update_image:
expanded_im = Image.core.fill(self.im.mode, self.size)
if self.mode == "P":
expanded_im.putpalette("RGB", "RGB", self.im.getpalette())
expanded_im.paste(self.im, (0, 0, *self.im.size))

self.im = expanded_im
frame_dispose_extent = x0, y0, x1, y1
flags = s[8]

Expand Down Expand Up @@ -447,13 +455,6 @@ def load_prepare(self) -> None:
self.im.putpalette("RGB", *self._frame_palette.getdata())
else:
self._im = None
if not self._prev_im and self._im is not None and self.size != self.im.size:
expanded_im = Image.core.fill(self.im.mode, self.size)
if self._frame_palette:
expanded_im.putpalette("RGB", *self._frame_palette.getdata())
expanded_im.paste(self.im, (0, 0, *self.im.size))

self.im = expanded_im
self._mode = temp_mode
self._frame_palette = None

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