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Spyffe
>>99674has it right. Vector graphics are arbitrarily scalable; however, they require that the program that generates them know about the underlying shapes in an image. This is usually only possible if a person drew them in the computer.
Raster graphics -- commonly used for photos -- are simply pixel-by-pixel representations which can be generated by sampling the image using a camera or scanner. They cannot be scaled arbitrarily.
Examples of vector graphics formats include .pdf (Adobe Portable Document Format), .ps (Adobe PostScript), .ai (Adobe Illustrator), .svg (Scalable Vector Graphics), .wmf (Windows Metafile), .emf (Enhanced Metafile), and .swf (Shockwave Flash).
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