I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 128)

Readiris TM 14 – User Guide
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Select the required XPS type from the drop-down list.
Note that iHQC compression is unavailable for XPS Text and
XPS Text-Image files.

Select the required compression level:
For Level I there are two types of compression: Good Size and
Good Quality. Good Size offers the best compression, with a
minimal loss of image quality. Good Quality offers slightly
larger output files with better image quality.