I think you'd find that it's far from "any human" who can do this without looking anything up. I have 15y of dev exp and couldn't do this from memory on the cli. Maybe in c, but less helpful to getting stuff done!
# curl -s https://upload.wikimedia.org/wikipedia/commons/6/61/Sun.png | file - /dev/stdin: PNG image data, 256 x 256, 8-bit/color RGBA, non-interlaced