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.....Vector graphics also known as object-oriented graphics, are created in various drawing programs. Vector images are stored as a display list describing the location and properties of the objects making up the image, such as shapes, arcs and lines. Raster graphics, also known as bit-mapped graphics, are created by scanners and digital cameras, like the one used on the MESUR Pathfinder. From this point on we will be discussing only raster graphics. Raster images are painted across the computer screen in an array of square elements called pixels. Pixel is short for picture element. Each pixel is stored in an area of memory called a bit-map. Each pixel has a numbered address. A formula is embedded into the image file, which give the location and value of every pixel. Storing similar information in vector graphics can take only several kilobytes. Raster images can take thousands of times more memory.
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