Megapixel: Instead of using film, digital cameras
capture images with a sensor. Usually, the sensor used is called a CCD (though some
manufacturers use CMOS sensors instead). Either way, the sensor is comprised of an array
of light-sensing dots, called pixels (short for "picture elements"). A camera's
resolution is simply the total number of pixels packed onto the CCD.
Resolution is measured in two different ways--either as a pair of numbers signifying width
times height (for example, 1,600 x 1,200) or as a total number of pixels. To convert from
the first measurement method to the second, simply multiply the width by the height. In
the previous example, 1,600 x 1,200 is approximately 2 million, indicating that this is a
2-megapixel (2-million-pixel) camera. Today's consumer cameras range from 640 x 480 (0.3
megapixels) to 2,048 x 1,536 (3.3 megapixels).
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