[barbariangrunge]

You measure your minimum resolving angle as a function of distance, then calculate what dpi that corresponds to. Except, since it’s an angle, distance matters here. So you add in what distance you’ll be from the display.

But I forget what numbers to plug in. We learned that in graphics courses back in uni, and how 4K big screen displays are probably only beneficial as though you are getting super sampling antialiasing

Edit: a quick google search returned:

> The human eye has an angular resolution of about 1 arcminute (0.02 degrees or 0.0003 radians) which enables us to distinguish things that are 30 centimetres apart at a distance of 1 kilometre

You just need some basic trig to do your calculation now, and to modify your resolving number based on some experiments based on your particular eyes

[Dylan16807]

It's more complicated than that. Angular resolution is where you can distinguish between one or two separate objects. You need an entire rod/cone/camera pixel in between to pick out the middle. But when it comes to viewing edges and lines, it's like using grayscale instead of black and white. Differences of position ten times as small can be distinguished.

https://en.wikipedia.org/wiki/Hyperacuity