I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 40)

Readiris TM 14 – User Guide
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Page Analysis Options
Note that you can also access these options via the Settings menu.
Page analysis
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.
Page orientation detection
This option detects in which direction your documents are oriented
and rotates them automatically.
Page deskewing
This options staightens - or deskews - pages that were scanned at an
angle.
Ignore Border Zones
When your scanner generates black borders around your
documents, or when your documents contain information that is
partially cut from the page, Readiris tends to create recognition
zones on the borders of the document, even though they do not