DPI stands for “dots per inch,” which is a measure of a printer’s quality. For high-quality printing, 300dpi is recommended. For example, a 300dpi image at 1200×1800 pixels will become as a 4×6 inch print. PPI PPI stands for “pixels per inch,” which is a measure telemarketing list of pixel density used by electronic image devices. You’ll likely see this used with scanners, cameras, TVs or monitors. Learn more about the difference between DPI and PPI.