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Resolution Issues

For Web images, dpi (dots per inch) does not matter. Many people feel that making their image 72 dpi is the proper way to adjust the file size for the Web, but that's not necessarily true. Measuring by pixels is the answer. Don't buy it? Follow along to see if it makes sense.

The display size of an image onscreen is determined by the pixel dimensions of the image plus the size and setting of the monitor. For instance, a typical 13-inch monitor displays 640 pixels horizontally and 480 vertically. An image with pixel dimensions of 640 by 480 would fill the screen. On a larger monitor with a 640 by 480 setting, the same image (with pixel dimensions of 640 by 480) would still fill the screen, but each pixel would appear larger. Changing the setting of this larger monitor to 1024 pixels by 780 pixels would display the image at a smaller size, occupying only part of the screen.


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