What is the difference between Vector and Raster Graphics?
The main difference between Vector and Raster Graphics is that raster graphics are composed of pixels (picture element), while vector graphics are made up of paths. Raster graphics, such as ‘gif’ and ‘jpeg’ files, represent an image as a matrix of individual pixels of various solid colours, which together form an image. As a raster graphic is made larger, each individual pixel increases in size, making the image look “blocky” or “pixelated”. Vector graphics on the other hand, use geometrical primitives, such as points, lines, and shapes or polygons, that are based on mathematical equations to represent images and pictures. A vector graphic file, such as eps or Adobe Illustrator files, are composed of paths and lines which are either straight or curved. These particular data files contain information on the points where the paths start and end, the colours that fill or border the paths, and how much those paths curve.
http://www.sharpened.net/helpcenter/answer.php?52, http://www.nw-media.com/ps_intro/html/lesson_1/lesson1_pg3.html
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