I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 71)

Readiris TM Corporate 12 – User Guide
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Depth
Readiris saves graphics in their original depth by default.
Readiris can also save graphics in black-and-white, grayscale and
color.
Quality
You can choose between Low, Normal and High quality graphics.
Resolution
Readiris retains the original resolution by default.
You can also choose to reduce the resolution to a lower dpi.
Note that you cannot increase the resolution.
Tip: When saving documents as HTML files to post on a website, reduce
the resolution to 72 dpi (screen resolution).