They can also be synthesized from arbitrary non-image data, such as mathematical functions or three-dimensional geometric models the latter being a major sub-area of computer graphics. Raster images can be created by a variety of input devices and techniques, such as digital cameras, scanners, coordinate-measuring machines, seismographic profiling, airborne radar, and more. These values are often transmitted or stored in a compressed form. Typically, the pixels are stored in computer memory as a raster image or raster map, a two-dimensional array of small integers. Pixels are the smallest individual element in an image, holding antiquated values that represent the brightness of a given color at any specific point. The digital image contains a fixed number of rows and columns of pixels. ![]() Raster images have a finite set of digital values, called picture elements or pixels.
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