I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 39)

Readiris TM Pro 12 – User Guide
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DJUSTING SCANNED DOCUMENTS
When opening or scanning extremely light or extremely dark
grayscale and color images, it may be necessary to adjust those
images before executing the recognition, in order to obtain
satisfactory OCR results.
To adjust images:
 Open or scan a color-grayscale document.
Make sure that the scanner settings are correct.
Important: the scanner settings and adjustment settings appear to
be the same but note that both sets of settings are applied at different
stages in the scan/recognition process.
 On the Process menu, click Adjust image.
Readiris uses intelligent binarization routines to convert color-
grayscale images into black-and-white images, which are used to
perform OCR on.