Where did the 44 come from? Well, I was lazy. So the spacing on my retina must be denser than 600/44*3.4 = 46 LP/mm. The focal length of the human eye is about 22mm. I don't perceive the distinct colors at this distance, though. The monitor displays 1280 lines over 375mm, so the lines have a density of about 3.4 line sets per millimeter (three colors make up each pixel). How do you figure? Where I'm sitting right now, about 60cm from my screen, I can clearly see the lines making up the screen. The optical resolution of the eye is, at best, about 15 LP/mm. Shortly, brain greatly alters data from our pixel, the cones so our sight is only an interpretation of what cones record. It's not just sensing the light intensity and color similar to a camera but interpretation of environment using info from optic nerve, memory, preconceptions, emotions, priorities, mood etc. Also related to consciousness, memory, psychology, NLP. There are many interesting phenomena about vision of living beings. This also helps for sensing a scene with greater resolution, and due to it there is no motion blur in human vision due to eyes' movement (motion blur in the opposite case, when the object moves and the eye is fixed)

That is due to aversion to danger, and focusing on prey/enemy There are saccades, which is the fast movement of both eyes, when the vision interpretation at the brain is inhibited (this is why you can never see your eyes' movement in the mirror say when focusing in the mirror image of your left eye and then shifting your focus to the right eye, even though they both are always nearly in the center of your field of view). It does not see uniformly, detect mostly motion at the edges (where only B&W vision helps with contrast) and detail in the center. Eyes may see all in its field of view however brain 'sees' selectively, it does not use entire range of vision simultaneously. I think not only human vision but al living vision is quite different than cameras. Some folks can manage with their eyes shut most of the time. So which images are real and which are not?Īnyway, bottom line, most people see very little or only what they want to see. On the other hand, radio telescopes capture radiation now from events that occurred billions of years ago, though what we 'see' is rather vague. Photographs capture light reflected from subjects that are no longer where they were when the picture was taken, or which may no longer exist at all. There are radio or supra-visible radiation frequencies we cannot perceive at all, except with instruments. Some creatures see or hear things we cannnot. In a world of darkness, all organisms would presumably confront the same. Blind people get by with no eyesight or photographs at all. The camera, meanwhile, has no such preference and will record lots of stuff that challenges human memory or which cannot be transmitted from one human to another by mere description.Īll visual images are, arguably, abstractions or analogies of their subject. The camera depth of focus may be limited, in a way that mimicks the eye, but a narrow aperture can also allow a camera to have very deep focus.Īn eye is an organ of a creature geared to perceive what it is conditioned to consider important, or what the viewer prefers to select from objects in a field of view. You don't notice that blind spot because it is blind and because the second eye can usually pick up the gap.Īnyway, a camera sensor tends to capture equal resolution across an entire field of view. The human eye has an area of focal vision, a whole lot of peripheral vision, and a blind spot were the optic nerve connects. Of course, if you only display on the monitor, then you can take the monitor resolution as the criterion, but that's not future proof, as 300 dpi monitors are already available in mobile devices. That's how many pixels you need to see in the photograph what you see with your eyes. So decide how large you want to print, then calculate necessary camera resolution at 300 pixels per inch of print. I think that if you take that as the criterion for the largest size print that you can produce, this rule will allow to determine the largest size of the print, that wouldĪpproach to a close distance if you want to see more detail.

I think the most practical rule is that for hand held prints we do not distinguish additional detail past 300 dpi. In the end, extra camera resolution simply allows one to print larger (assuming we compose to avoid cropping). I am wondering about the complaints of people who say that 22 MP is not enough? What is the resolution of the human eye? To see on a photograph what I see with my eyes, do I need more resolution?

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