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use Image.LANCZOS instead of Image.ANTIALIAS for thumbnail resize #15876

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Jul 5, 2023
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use Image.LANCZOS instead of Image.ANTIALIAS for thumbnail resize #15876

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1 change: 1 addition & 0 deletions changelog.d/15876.bugfix
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Correctly resize thumbnails with pillow version >=10.
2 changes: 1 addition & 1 deletion synapse/media/thumbnailer.py
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Expand Up @@ -131,7 +131,7 @@ def _resize(self, width: int, height: int) -> Image.Image:
else:
with self.image:
self.image = self.image.convert("RGB")
return self.image.resize((width, height), Image.ANTIALIAS)
return self.image.resize((width, height), Image.LANCZOS)

def scale(self, width: int, height: int, output_type: str) -> BytesIO:
"""Rescales the image to the given dimensions.
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