What is DPI / PPI?
DPI refers to dots per inch when using an ink based printer. It is a measure of resolution or image quality. Typically, the higher the dpi count, the better the print quality. This term is still used when discussing digital image quality; however, this is not the correct term. PPI describes the resolution, in pixels, of an image to be printed within a specified space. For instance, a 100×100-pixel image that is printed in a 1-inch square could be said to have 100 pixels per inch, regardless of the printer’s DPI capability. Used in this way, the measurement is only meaningful when printing an image. Good quality photographs usually require 300 pixels per inch when printed.
