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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 means Dots Per Inch and tells the number of printed points (dots) per inch. PPI means Pixel Per Inch and tells the number of pixels per inch. DPI and PPI are basically the same, except PPI is the more correct designation, and DPI only applies to certain printers and printing methods.