To add, the real posters are serigraphs. Looking at the real ones you'll see the edges are not perfectly straight if multiple colors are used:
It's because how the poster is "painted" on with each color being its own layer. Anything else isn't going to give you this. And with that, you'll get very obvious "lines" on parts that overlay another layer:
(edge of Figments head)
(edge of the colored triangles touching the dark solid blue)
Another example (you'll have to open this one up and zoom):
All of them have these "artifacts". It's a quick and simple way to tell a real one from a fake if you see (or have!) one without a number. Unless you get the silver paper (which is pretty easily available), get a
very high quality image, and commission a printing place, you won't get this.
This is hilariously off: