I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 77)

Readiris TM Pro 12 – User Guide
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C REATING PDF DOCUMENTS
Readiris generates four types of PDF output: Text, Text-Image,
Image-Text and Image.
To generate PDF output:
Click the Format button on the main toolbar and select the PDF
type of your choice in the Send to or External file drop-down list:
PDF Image
When you select PDF Image, Readiris generates image-only PDF
documents, it does not execute OCR.
PDF Image-Text
When you select PDF Image-Text, Readiris recognizes text and
creates searchable PDF files that contain the page image and the
recognized text.
The page image is placed on top of the text.
With this format you can always see the original document (as it
was scanned) while you are able to search for and copy-paste the
OCRed text, which is hidden beneath the image. As a result, this
format is useful for archiving purposes.
PDF Text
When you select PDF Text, Readiris recognizes text and creates
searchable PDF files.
The page image is not contained in these single-layered PDF files.