I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 80)

Chapter 10 – Formatting and saving document s
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 On the PDF Options tab, select the required compression level.
Readiris Pro supports Level I - Good size and Level I - Good
quality compression.
Readiris Corporate also supports both Level II and III Good
size and Good quality compression as well as Custom
compression.
In Level II compression the option Compress symbols is
enabled automatically to compress text compactly.
In Level III compression also the option Wavelet compression
is enabled automatically to compress graphics compactly.
When you select Custom compression, you can enable or
disable these options independently of one another. You can also
use the slider to define the Good size - Good quality ratio.
 Click Recognize + Save to recognize the document and save it
as an iHQC compressed PDF file.