Quote:
Originally Posted by GeoffR
The human eye can see things that are much smaller than what it can resolve. You don't need to be able to resolve the individual dots on a screen to be able to see the difference that a higher DPI screen makes.
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Correct. Being able to resolve individual pixels is a sure sign that the resolution is too low or the display too close.
Quote:
Originally Posted by GeoffR
The "resolution" of the human eye is often given as one minute of arc, which corresponds to about 344 DPI at a distance of ten inches.
However anyone with normal eyesight can easily see Mars, which has an apparant size of 25 seconds of arc at its closest approach, equivalent to one dot on a 825 DPI display at ten inches.
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It is a bit more complicated than that. All but the closest stars can not be resolved even by a powerful telescope, But individual stars thousands of light years away are easily seen with the unaided eye because they are so bright.
But even high brightness is not required for this effect. High altitude digital photography can show roads significantly narrower than a single pixel because they affect the color and brightness of the pixels they are in.
You can do the same thing taking pictures of narrow black lines on white paper, but with today's camera resolutions, it might not be trivial to get far enough away from the paper.