I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 41)

Readiris TM Pro 12 – User Guide
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Example 1: lighten a dark image to eliminate the page background.
(Color image)
(Binarized image. The default binarization settings yield a black
image)
(The lightened image yields satisfactory recognition results)
Example 2: darken an image when the text is so light it doesn't show
up in the binarized image.
(Color image)