Photos print best at 300 dots per inch (dpi) resolution.
That means that an image needs to be 2400 pixels wide and 3000 pixels high to print on an 8 x 10-inch photo paper at 300 dpi.
Scan 8 x 10 photos at 300 dpi.
Scan smaller photos at a higher resolution to have enough pixels to print 8 x 10 at 300 dpi.
Calculations
