Image Size

The size of a digital image is referred in several different ways. The most informative, and least common, method is to refer to its horizontal and vertical dimensions, a typical image might have a size of 2000 X 3000 pixels. This provides information about the shape of the image as well as its size. But the most common way to refer to image size is to refer to its overall number of pixels, multiplying the horizontal by the vertical dimensions. In this example getting a result of 6,000,000 pixels or 6 mega pixels.

Finally, it is also common to refer to image size in terms of megabytes (MB). Traditionally, computers used 3 bytes of information to store 1 pixel. By multiplying the number of pixels by 3, you get the size in MB, or 18 MB in this example.

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