# Raster graphics

## Matrix-based data structure / From Wikipedia, the free encyclopedia

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In computer graphics and digital photography, a **raster graphic** represents a two-dimensional picture as a rectangular matrix or grid of pixels, viewable via a computer display, paper, or other display medium. A raster is technically characterized by the width and height of the image in pixels and by the number of bits per pixel.^{[citation needed]} Raster images are stored in image files with varying dissemination, production, generation, and acquisition formats.

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The printing and prepress industries know raster graphics as **contones** (from *continuous tones*). In contrast, line art is usually implemented as vector graphics in digital systems.^{[1]}

Many raster manipulations map directly onto the mathematical formalisms of linear algebra, where mathematical objects of matrix structure are of central concern.