Volume 91 - DPI versus PPI - What's the Difference - Supplement
Are you confused about the two terms PI and PPI? You may have come across the terms Dots Per Inch (DPI) and Pixels Per Inch (PPI) when describing digital image resolution. Although the terms are often used interchangeably, they are NOT the same. There are key differences between DPI vs PPI.
This is a downloadable PDF document which will attempt to explain the difference between DPI and PPI.