Prioritise speed in _repr_png_ #7242
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Resolves #7241
When ImageShow saves an image as a PNG, it uses "compress_level" of 1
Pillow/src/PIL/ImageShow.py
Lines 177 to 178 in 1174a9e
This prioritises speed over file size, presumably because this image is intended to just be shown, not saved for later use.
That same logic would apply to
_repr_png, so this PR adds "compress_level" of 1 to that functionality as well.