A guide to multi-DPI and platform design (Sebastien Gabriel)

DPI or Dots Per Inch is a measure of spatial dot density initially used in print. It's the number of ink drops your printer can put in an inch . A smaller DPI yields a less-detailed image. This concept is applied to computer screens under the name PPI for Pixels Per Inch. Same principle: It counts the number of pixels your screen can display per inch. The name DPI is also used in screens." http://bit.ly/XGLVeh (sebastien-gabriel.com)