Resolution definition

Resolution refers to the amount of information that a scanned image contains.  Resolution is measured in dots per inch (dpi).  The dots are the pixels that create the digital image.  A resolution of 72dpi signifies that in each inch of the image there exist 5184 pixels (72 x 72) in every square inch.  Dpi is also known as pixels per inch (ppi) as well as ‘res’ (the metric resolution for each millimeter).