When should I use 400 DPI?
400 DPI is ideal for scanning photographs for archival purposes, printing fine art, and any situation where you want extra detail beyond the standard 300 DPI. Most printers support 400 DPI.
Is 400 DPI better than 300 DPI?
400 DPI provides about 33% more detail than 300 DPI per inch. The difference is subtle for most prints but noticeable in fine details, small text, and close-up viewing. File sizes are larger.