Photo books are viewed up close — 300 DPI is a solid target. Compare your short side to the page size.
Recommended DPI for photo book
Start around 300 DPI, then adjust for size and viewing distance. Fine detail and text need higher DPI than soft photographic backgrounds.
Pixels still matter most
Pick the final print size first, multiply by target DPI, and check whether your file has enough pixels on the short side.
FAQ
What DPI do I need for photo book?
Often around 300 DPI, but large pieces viewed from farther away can use less.