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Does this 'IPTC' tag survive common image editing? Or are they targeting it towards an external application? If it was just for recognizing re-uploads, they co
by unilynx 7y ago
Does this 'IPTC' tag survive common image editing? Or are they targeting it towards an external application?
If it was just for recognizing re-uploads, they could have just stored the sha-256 hash serverside..
- lucb1e 7y agoIt's up to the editor to keep metadata. In Gimp you can choose in the advanced export settings, but I don't know the default. Re-encoding will definitely change any hash, but editors may (not sure how commonly) keep these tags. You'd have to do steganography if you want it to be more persistent than a metadata tag. Edit: I just saw it's not a normal EXIF tag, this is something else. I'm not sure how this is handled, might be interesting to do some empirical testing!