Epson 35mm Negative Flim Holder for V750 Epson Scanner

What is the difference between optical and interpolated resolution?

Optical resolution is the highest resolution a scanner can physically capture an image. The interpolated resolution is a software algorithim that makes the image appear as if it was scanned at a higher resolution. The software makes extra pixels to fill in the spaces to make the image larger than the actual scanned resolution. This is comparible to the digital zoom of a digital still camera.