I have a lot of old photos that I wish to scan. My scanner allows me to modify only the DPI. The available DPI options are as follows:
DPI - 100x100, 150x150, 200x200, 300x300, 400x400, 600x600, 1200x1200, 2400x2400, 4800x4800, 9600x9600, 19200x19200.
When I use a low DPI I get a low-quaility scan but it's fast. When I go up to 1200x1200 DPI it takes forever to complete a single scan. My question - is there any rule for which DPI to choose, or should I just go with the best combination of speed and quality (in my case - 600x600).
Thanks..