I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 34)

Chapter 5 – Scanning documents
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You can also use the windowing tools on the image toolbar to
modify the page analysis results or to window documents manually.
For more information, see the chapter Windowing documents.
 When you are done defining all the settings (Scanner settings,
Document type, Options), click the Scan or Open button to
scan documents or open image files.
Note that the above-mentioned options are also available on the
Settings menu.
O PENING IMAGE FILES
With Readiris you can either process paper documents you scan
with your scanner or process already existing images files of
various formats.
To open existing image files:
 Click the Open button to search for image files.