I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 45)

Readiris TM Corporate 12 – User Guide
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o Use the slider to increase or decrease the Brightness.
The Brightness settings determine the overall brightness of the
image. Use these settings to darken or lighten the image when the
text is illegible.
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)