I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 115)

Section 9: Saving Documents
122

JPEG quality
Images stored inside PDF, XPS, Word and RTF documents are
saved in the JPEG format.
Use the slider to adjust the JPEG quality.

JPEG 2000 compression
When saving files in the PDF or XPS format, Readiris can apply
JPEG 2000 compression to the color-grayscale images stored
inside those files.
S
ELECTING THE
PDF O
PTIONS
The documents you process with Readiris can be saved as PDF
documents.
About PDF documents
PDF stands for "Portable Document Format". It is a format
developed by Adobe System Inc. to facilitate document exchange.
PDF files are device-independent and resolution-independent, and
can be opened on any Operating System (Windows, Mac OS,
Linux, iOS, Android, etc.) PDF files are mostly used for storage
purposes. Note that the content of PDF files cannot be edited
(easily).
To save documents as PDF documents:

Click the Format button in the Output group.