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Raster graphics refers to computer graphics in which an image is composed of an array of pixels arranged in a grid of rows and columns.[1] The counterpart to this display method is vector graphics.[2]

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The term originates from vintage cathode-ray tube (CRT) video displays that were covered by a sweeping electron beam that would illuminate pixels in a series of horizontal lines from top to bottom. The beam then returns to the top during the vertical flyback interval to draw the next image.[3] The speed of this process is referred to as the frame rate.[4]

Raster graphics were once synonymous with monochromatic bitmap graphics when the simple binary (on/off) state of each bit corresponded with the illumination of a pixel. However, the color depth of raster graphics have since expanded to be able to display RGB color values with increasing precision.[5]

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