See this other HN thread - https://news.ycombinator.com/item?id=28091750 https://news.ycombinator.com/item?id=28091750 - they make it a 'perceptual hash' instea

See this other HN thread - https://news.ycombinator.com/item?id=28091750 https://news.ycombinator.com/item?id=28091750 - they make it a 'perceptual hash' instead of a bytestream hash since they know a lot can and will be done to try to evade PhotoDNA and NeuralHash.