A flatbed scanner natively supports a single optical resolution plus a number of resolutions that are a whole-number ratio (a.k.a. “even divisor” or “submultiple”) of the optical resolution. For example:
| Scanner Optical Resolution | Fraction | Native DPI |
|---|---|---|
| 6400 | 1/1 | 6400 |
| 6400 | 1/2 | 3200 |
| 6400 | 1/4 | 1600 |
| 6400 | 1/5 | 1280 |
| 6400 | 1/8 | 800 |
| 6400 | 1/10 | 640 |
| 6400 | 1/16 | 400 |
| 4800 | 1/1 | 4800 |
| 4800 | 1/2 | 2400 |
| 4800 | 1/3 | 1600 |
| 4800 | 1/4 | 1200 |
| 4800 | 1/5 | 960 |
| 4800 | 1/8 | 600 |
| 4800 | 1/10 | 480 |
| 4800 | 1/12 | 400 |
| 2400 | 1/1 | 2400 |
| 2400 | 1/2 | 1200 |
| 2400 | 1/3 | 800 |
| 2400 | 1/4 | 600 |
| 2400 | 1/5 | 480 |
| 2400 | 1/6 | 400 |
| 1200 | 1/1 | 1200 |
| 1200 | 1/2 | 600 |
| 1200 | 1/3 | 400 |