I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 32)

Chapter 5 – Scanning documents
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 Select the image file of your choice and click Open.
Note: the options of the Input dialog box also apply to document
scanning and are discussed in the Scanning paper documents
section.
Note that you can specify other settings before opening (or
scanning) documents. For more information, see the sections below.
S
CANNING PAPER DOCUMENTS
With Readiris you can either process paper documents you scan
with your scanner or process already existing images files of
various formats.