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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.
Dots per inch. In printing, DPI (dots per inch) refers to the output resolution of a printer or imagesetter, and PPI (pixels per inch) refers to the input resolution of a photograph or image. DPI refers to the physical dot density of an image when it is reproduced as a real physical entity, for example printed onto paper.