I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 35)

Readiris TM Pro 12 – User Guide
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Note that this option never increases the resolution of images scanned
with too little detail.
Scanning multipage documents
When scanning multipage documents and using a scanner
equipped with a document feeder, select the ADF (automatic
document feeder ) option. Place the pages you want to scan in the
feeder and start scanning.
Or use interval scanning when using a flatbed scanner: select the
option Scan another page after and indicate after how many
seconds you want Readiris to scan another page.
For more information, see the section Scanning and recognizing
multipage documents.
Important: any options that are unavailable for the selected scanner
appear dimmed.
Scanning landscape images
Select the Landscape option when scanning landscape-oriented
images.
Auto-exposure
With some scanners the option Auto-exposure is selected by
default. This option adjusts the contrast and brightness settings
automatically.
Scanning inverted images
Select the Invert option when scanning inverted black-and-white
images.