So I am toying with the idea of making a poster and everything is pretty good except the main picture may not have the resolution to do a good one.
For printing how little resolution would be acceptable? 150, 200, 300, more?
I understand the higher the better but a 4"x6" poster is not nearly as fun as say a 24"x18"
With a 24"x18" size project the photo has 137x138 dpi...