I only just thought of this. I have the same cartoon-y profile pic from a foreign TV show on a bunch of my accounts, I wonder if its unique enough and worth tracking.
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I don’t think they use picture analyzing software for tracking. It’s very resource heavy because it uses systems similar to LLMs. You can make very slight changes to your pfp (just one changed pixel is enough) for every website to avoid hash match but it’s not necessary I think. If someone wants to manually find your accounts though then it won’t be too hard for them.
can’t you quantise and downscale the image, then take the hash?
Yes
That works too but then the image will be the resolution of a Minetest texture after uploading.
no i mean downscaling and quantising before taking the hash to be able to reliably get the same hash for images that have been compressed, downscaled, had individual pixels edited, etc
Oh that’s smart but I don’t think they use it for tracking now. The most they can do is check the hash for known CSAM.
Often websites modify your pfp too, like changing the image format or quality.
Yes but I think most of them use absolutely the same transformation so the resulting image is the same. I really can be wrong though.
Nah they don’t. I uploaded the exact same pic to a bunch of different work profiles (slack, google, microsoft). I inspected them out of curiosity and they were all different sizes and resolutions.
Hmm then no need to worry about it I guess
You should still worry about it for manual association. I rarely use them outside work.