Digital Photography

Many digital cameras specifications will mention the number of horizontal and vertical pixels that make up the digital photograph. For example, one camera might produce photos that are 2272 pixels wide and 1704 pixels tall. Another camera will produce an image that is 4492 x 3328.

You can find out the number of megapixels by multiplying the horizontal and vertical pixels. In the first example, the camera captures about 3.9 megapixels (2272 x 1704 = 3,871,488). In the second example, the camera captures about 15 megapixels (4492 x 3328 = 14,949,376).

The minimum recommended resolution (measured in pixels-per-inch, or ppi) for printing quality photos is 240 ppi.