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Raster Images

• A Raster image is a collection of dots called pixels.
  
• Each pixel is a tiny colored square.
  
• When an image is scanned, the image is converted to a collection of pixels called a raster image
  
• Scanned graphics and web graphics (JPEG and GIF files) are the most common forms of raster images.
  
• The quality of an imprint produced from a raster image is dependant upon the resolution (dpi) of the raster image, the capabilities of the printing technology and whether or not the image has been scaled up.
  

Vector Images

• A vector image is a collection of connected lines and curves that produce objects.
  
• When creating a vector image in a vector illustration program, node or drawing points are inserted and lines and curves connect notes together.
  
• Each node, line and curve is defined in the drawing by the graphics software by a mathematical description.
  
• Text objects are created by connecting nodes, lines and curves.
  
• In a vector object, colors are like clothes over the top of a skeleton.
  
• They can be scaled up or down without any loss of quality.
  
• Since vector images are composed of objects not pixels, you can change the color of individual objects without worrying about individual pixels.