DPI, known as Dots Per Inch, is the resolution of a raster image or scanned image. Printer and scanner resolutions are also measured in dpi. Your typical desktop laser printer will print at 300-600 dpi. At laser Sharp Sign Design we use a HP Laser Printer, with a very high dpi it gives us the ability to create smoother and cleaner products. The poducts final quality of printing depends on the resolution of the image being used to print, called the bitmap or scan.
Take a 400 dpi image and increase the size in a graphics program. When you do this, you have only made the tiny pixel squares bigger. This creates whats called the "jaggies", by making the image bigger it gave you a jaggy edge. When dealing with raster images know that in order to "blow it up" you must have a high resolution picture or be able to transvert the image into a vector file using programs such as Coreltrace or Eurovector.
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