How can one know if an SE image got compressed by the SE image downsizer?

Question

Comparing the original image's hash with SE image's hash could work but only for the uploader (since they are the only one to have the original image) and in many cases won't work as some metadata are removed.

Just download the image from the URL inserted in the draft post and compare the size or MD5 hash against the original? — Sonic the Anonymous Hedgehog
– Sonic the Anonymous Hedgehog, Commented Jan 2 at 23:10
I think this question can be boiled down to: Compare two image files for identical data - excluding metadata? — Meta Andrew T.
– Meta Andrew T., Commented Jan 3 at 5:07

Franck Dernoncourt · Accepted Answer · 2025-01-05 19:01:53Z

How can one know if an SE image got compressed by the SE image downsizer?

If OP and still have the original image, see Compare two image files for identical data - excluding metadata?
Otherwise, not possible.

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