====== Scanner Native Resolution ======

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  |