Have you ever downloaded and then printed a picture from the internet, only to get results that were, well, less than you anticipated? On your computer screen, the picture looked fantastic, but when you printed it, it was either printed at a postage stamp size or printed at a respectable size but looked fuzzy or "blocky"? Image resolution is the culprit.
That's not really fair to say, frankly. Picture resolution wasn't intentionally set out when you printed your internet photo to make your life miserable. The issue was simply because most pictures on the internet have very small pixel dimensions, usually 640 pixels wide by 480 pixels high or even smaller in the neighborhood, and that's because images don't need to be very big to display on your computer screen at a reasonable size and good quality.
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