What Are Vector and Raster Graphics?
Vector graphics are displayed mathematically as a series of x and y co-ordinates. Raster images are a series of pixels (like single colour squares). If you enlarge a raster image, it becomes jagged and loses detail because the number of pixels remains the same – they just grow in size. Vector graphics are scalable because they are defined as moveable points – the graphic can be greatly increased without any loss of quality. Photos are raster images so it is important to use a high quality image of large pixel size in printed material.
