It's only an approximation that cameras do point sampling, as the sensors are obviously not points. That camera sensors mean a different thing for a pixel than

It's only an approximation that cameras do point sampling, as the sensors are obviously not points. That camera sensors mean a different thing for a pixel than what's typical for an image or an electronic display is a matter of convention. True that interpolation is possible, but that's no reason to use different conventions as noted above. I have seen a display manufacturer manipulate the same to artificially boost their resolution specifications.