Yeah, there's a similar thing you can do with gamma correction. https://superuser.com/questions/579216/why-does-this-png-image-display-differently-in-chrome-fi

Yeah, there's a similar thing you can do with gamma correction. https://superuser.com/questions/579216/why-does-this-png-image-display-differently-in-chrome-firefox-than-in-safari-a https://superuser.com/questions/579216/why-does-this-png-ima... Or with, uh, analog image processing: https://en.wikipedia.org/wiki/The_dress https://en.wikipedia.org/wiki/The_dress If you're hosting an image, you can also have some fun with referrer, user-agent, geo-ip, etc, based redirection. Where you post an image in a forum or similar, and different users see a different image.