PPI = pixels per inch (your image).
DPI = dots per inch (the printer device).
For file prep, focus on PPI—that’s your pixel count divided by print inches.
What PPI do I need?
- 300 PPI for close viewing (magazine, photo prints).
- 150–200 PPI for wall posters and A-series seen from a distance.
How to hit the number
- Decide your paper size (e.g., A2).
- Multiply inches by target PPI → required pixels.
- If you’re short, upscale to exceed the pixel target, then downsize slightly to the final size.
Common myths
Myth: “I must set 300 DPI in metadata.”
Reality: Export enough pixels; the metadata flag alone won’t invent detail.