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Printers today need on average between 200 and 300 ppi (dpi) of image resolution information to print a high quality image on high quality paper. And I am going to make the assumption that most of us seldom print out a photograph larger than 8Ã10 inches.
DPI, or Dots Per Inch relates to the dot density when printing. To help better understand the relationship of DPI to pixel dimensions, take an 800x600 pixel image for example: 1  Using 300dpi, an 800x600 image will print 2.6x2 inches.2  Using 200dpi, an 800x600 image will print 4x3 inches.t's used to descibe the output resolution of printers, and it's also often used instead of the PPI (Pixels Per Inch) unit, which is more appropriate for describing the resolution of computer screens, scanners and image files.