It may sound like marketing wank, but it does a appear to be an established term of art in academia as far back as 1997 [1] It just means that a person can't r

It may sound like marketing wank, but it does a appear to be an established term of art in academia as far back as 1997 [1] It just means that a person can't readily distinguish between the compressed image and the uncompressed image. Usually because it takes some aspect(s) of the human visual system into account. [1] https://scholar.google.com/scholar?hl=en&as_sdt=0%2C22&q=perceptually+lossless+compression&oq=perceptually+loss#d=gs_qabs&t=1731070431464&u=%23p%3DyYZxS9hvkKkJ https://scholar.google.com/scholar?hl=en&as_sdt=0%2C22&q=per...