[astrange]

That applies to individual samples. The eye gets around this by saccading (rapid movements) to get multiple samples. Also, you interact with your environment rather than passively sampling it, so if you want to look closer at something you can just do that.

Images aren't truly bandlimited because they contain sharp edges; if they were bandlimited you'd be happy to see an image upscaled with a Gaussian kernel, but instead it's obviously super blurry.

When we see an edge in a smaller image we "know" it's actually infinitely sharp. Another way to say this is that a single image of two people is fundamentally two "things", but we treat it as one unified "thing" mathematically. If all images came with segmentation data then we could do something smarter.

[pvillano]

"In optics, any optical instrument or system – a microscope, telescope, or camera – has a principal limit to its resolution due to the physics of diffraction." This might be what wbl is referring to.