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    Graphics Glossary

    		     
    GraphicsAcademy.com  >  Glossary  >  DPI

       

     

    DPI

    DPI (an abbrevation for "Dots Per Inch"), also known as "PPI" (which stands for "Pixels Per Inch") is a measure of resolution in bitmaps, and bitmapped-devices (for example, screen displays and printers).

    DPI measures the number of pixels for every inch of display/print-out. The higher the DPI, the better the quality of the results.
    • Screen displays usually are fairly low resolution devices, and typical DPIs are often as low as 72 DPI, or 90 DPI.

    • Low resolution is often much more obvious in printed documents, so these are usually prepared at a higher DPI. Typical home/office often printers have a resolution of 300 DPI to 600 DPI. Professional quality printers (used for magazines, etc.), usually have higher resolutions, and arund 1500 DPI is typical.
    If you send a low resolution bitmap to a higher resolution device, one of there are two possible consequences:
    1. The bitmap can be kept (not scaled) at same number pixel size, in which case it will appear very small on the output medium.

      For example:

      Imagine you have a 300 by 300 pixel bitmap.

      • If you display this bitmap on a 90 DPI screen display, without scaling, it will appear 3.33 inches by 3.33 inches on the screen (because 300 / 90 = 3.33).

      • If you print this bitmap on a 600 DPI printer, it will appear 0.5 inches by 0.5 inches on the paper (because 300 / 600 = 0.5).

    2. The bitmap can be scaled up to keep the same physical size (in inches) by increasing the pixel size, in which case jaggies will appear.

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