I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 84)

Chapter 10 – Formatting and saving document s
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I HQC COMPRESSING XPS DOCUMENTS
Besides four types of "regular" XPS output, Readiris offers iHQC
compressed XPS output. XPS documents of the types Image-Text
and Image can be hyper-compressed by means of iHQC.
iHQC stands for intelligent High-Quality Compression, I.R.I.S.'
proprietary, efficient compression technology. iHQC is to images
what MP3 is to music and what DivX is to movies.
To generate iHQC compressed XPS output:
 Click the Format button on the main toolbar and choose
between the two output modes.
 In the Send to or External file list, select the PDF type of your
choice: XPS Image-Text or XPS Image.
 On the XPS Options tab, select the required compression level.
Readiris supports Level I Good size and Level I Good quality
compression.