When do I need 1200 DPI?
1200 DPI is used for professional laser printing, prepress production, and archival-quality scanning of photos and documents. Most consumer inkjet printers don't benefit beyond 300-600 DPI.
Will 1200 DPI make my image look better?
Changing DPI metadata doesn't add pixels or detail. If your image is 3000px wide, setting it to 1200 DPI means it will print at only 2.5 inches wide but with extreme sharpness.
What is the difference between 300 and 1200 DPI?
1200 DPI packs 4 times more dots per inch than 300 DPI. At 300 DPI, a 3000px image prints at 10 inches. At 1200 DPI, the same image prints at 2.5 inches but with maximum sharpness.