I've been pondering this perplexing pixel problem for a while, and thought that someone here may have the answer: How large is a pixel?
What I mean is this. If there's an image that has a resolution of 72ppi, typical for web presentation, and another image, from a scanned version of the same source, of 4000ppi, are the pixels in each image the same size? It doesn't seem possible, since if 72 pixels make up an inch each individual pixel would seem to be larger than if there were 4000 pixels in the same space. But then, if an image has more pixels per inch than another image, why is the image larger. Example: one scans a photo @ 100ppi and again @ 1000ppi, the 1000ppi scan has greater dimensions, but, it seems to me, it's just crammed more pixels into the same space, and the dimensions should be the same, right? Shel
