HP Deskjet 6620 HP Deskjet 6600 series printer - (Windows) Reference Guide - Page 70

Maximum dpi The Maximum dpi print quality setting offers 4800 x 1200 optimized dpi printing. The 4800 x 1200 optimized dpi print mode is the highest quality resolution for this printer. When 4800 x 1200 optimized dpi is selected in the printer driver, the tri-color print cartridge prints in the 4800 x 1200 optimized dpi mode (up to 4800 x 1200 optimized dpi color and 1200-input dpi). If a photo print cartridge is also installed, the print quality is enhanced. A photo print cartridge can be purchased separately if it is not included with your printer. Note: Use an HP premium photo paper when printing in the Maximum dpi print quality setting in order to enhance color matching and detail in the photo. Follow these steps to print in the 4800 x 1200 optimized dpi mode: 1. Open the Printer Properties dialog box. 2. Click the Paper/Quality tab. 3. Click Maximum dpi in the Print quality drop-down list. Note: The Maximum dpi setting temporarily uses a lot of disk space and may print slowly. 4. Select any other print settings that you want, and then click OK.