| Code Value |
Definition |
| EST-AUTO | Resolution was estimated by an automated process. |
| EST-HUMAN | Resolution was estimated by a human |
| FIXED | Resolution is known since the image was acquired from a fixed-resolution capture device other than a flatbed scanner |
| FLATBED | Resolution is known since the image was acquired from a flatbed scanner with a fixed resolution |
| FORM | Resolution was calculated based upon the use of a standard form with a known scale |
| RULER | Resolution was calculated based upon a ruler present in the image |