A megapixel is simply 1,000,000 pixels (1 million), however these could be arranged in any format, but a square containing 1 million pixels would be 1000 pixels by 1000 pixels.

Modern digital photographic cameras often offer 15 megapixels, the pictures are not square but a square photo containing 15 megapixels would be 3,873 by 3,873 pixels.

Full high definition television is 1920 pixels by 1080 pixels in a 16:9 ratio, and this is equivalent to approximately 2 megapixels.

Standard definition TV (720 x 576) is approximately 0.4 megapixel (this will give some idea as to the printable quality of even high-def TV pictures).

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