I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 34)

Section 3: Basic Document Processing
38
Page Analysis is selected by default. This option divides your
documents into recognition zones. Without recognition zones,
Readiris cannot process your documents. If you choose to disable
this function, you will need to draw recognition zones manually
on your documents.
Readiris can deskew (straighten) and rotate the documents you
open.
Processing documents
Step 1: Scan or Open your documents

Click Scan to scan paper documents with your scanner.
In order to scan documents your scanner must be correctly
configured. See the section Configuring your scanner if
necessary.
or

Click From File to open existing image files.
The images are displayed in the interface. If necessary you can
modify the recognition zones. See the section Editing the
Recognition Zones for detailed information.