What Is Image Resolution?

The term "resolution" refers to the amount of information a digital image file contains, typically measured in pixels. Generally speaking, the higher an image's resolution, the more detailed and crisp it will appear on a printed page.

What Are Pixels and Megapixels?

A pixel is a tiny block of color and is a digital image's most basic building block. A digital image is composed of thousands or millions of individual pixels. The more pixels an image contains, the greater its detail. One million pixels equal one megapixel; therefore, a 3.1-megapixel digital camera can take photographs that contain more than 3 million pixels.

Most graphics-editing applications list an image's resolution using pixel dimensions, with the horizontal measurement coming first. For instance, an image with dimensions listed at "2592x1944" would contain 2,592 horizontal pixels and 1,944 vertical pixels. Multiplying these two numbers gives you 5,038,848 pixels, or approximately 5 megapixels of resolution.

Megapixel Calculator: http://web.forret.com/tools/megapixel.asp?

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