Whats the Difference Between Pixels Per Inch and Dots Per Inch?
Though often used interchangeably, pixels per inch (PPI) and dots per inch (DPI) are technically not the same thing. PPI refers to the number of pixels found in one inch of a digital image or a computer monitor. While PPI does not affect the actual quality of the image itself, it can affect how an image appears on the Web or in print. DPI, on the other hand, refers to the amount of resolution a printer is capable of outputting. Printers use dots of ink to render an image; the more dots a printer can produce per square inch, the better quality its output. Though many image-editing programs — including older versions of Photoshop — contain settings for changing an image’s DPI, most of these applications are really only altering the PPI settings.
