It has become commonplace to refer to PPI as DPI, even though PPI refers to input resolution. Industry standard, good quality photographs usually require 300 pixels per inch, at 100% size, when printed onto coated paper stock, using a printing screen of 150 lines per inch (lpi).
Then, what resolution do I need for a 24x36 print?
Image Resolution and DPI Requirements
|Print Size/Product||Minimum Image Resolution|
|16x20 Posters||2980x2384 pixels|
|20x30 Posters||4470x2980 pixels|
|24x36 Posters||5400x3600 pixels|
|2x6 Banner||1800x1440 pixels|
What resolution is required for large prints?
For a 4" x 6" print, the image resolution should be 640 x 480 pixels minimum. For a 5" x 7" print, the image resolution should be 1024 x 768 pixels minimum. For an 8" x 10" print, the image resolution should be 1536 x 1024 pixels minimum. For a 16" x 20" print, the image resolution should be 1600 x 1200 pixels minimum.
What is a good resolution for a poster?
For 24"x36" posters, some studios work in full 300dpi. Others find that resolution too demanding on the computer, and work at half-size (150dpi). Then I was told printers will print movie posters at 72dpi so anything above that is wasted anyway.