These are all the possible values for the IG_ISIS_TAG_SCANTYPE tag.
| IG_ISIS_SCANTYPE_AUTOMATIC | Scan from the ADF if pages are detected; otherwise, scan from the flatbed. |
| IG_ISIS_SCANTYPE_TRANSPARENCY | Scan from the transparency unit. |
| IG_ISIS_SCANTYPE_FLATBED | Scan from the flatbed. |
| IG_ISIS_SCANTYPE_FEEDER | Scan only the front side of the page (duplex scanner). |
| IG_ISIS_SCANTYPE_FRONTONLY | IG_ISIS_SCANTYPE_FEEDER |
| IG_ISIS_SCANTYPE_DUPLEX | Scan in duplex mode (duplex scanner), from the feeder. |
| IG_ISIS_SCANTYPE_FRONTBACK | IG_ISIS_SCANTYPE_DUPLEX |
| IG_ISIS_SCANTYPE_BACKFRONT | Scan in duplex mode, but return the back side of the page first (duplex scanner), from the feeder. |
| IG_ISIS_SCANTYPE_BACKONLY | Scan only the back side of the page (duplex scanner), from the feeder. |