raster data

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A raster data is formed by a matrix of pixels(or cells) organized into rows and columns where each pixel contains some value (not necessarily a single number), which may be interpreted in many possible ways, for example as color. Examples of raster data are photos, scanned documents and bitmaps. There are many file formats describing how one can store such data, with or without information loss. E.g. bmp, jpeg, png, gif and so on.