I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 108)

Readiris TM 14 – User Guide
103
PDF Type
Select the PDF type from the Type list:
 Text. This file type contains the recognized text, but does not
contain the original image of your document. Any images in the
original document are included as graphics in the PDF file.
 Text-Image. This file type is the opposite of PDF Image-Text. It
contains the original image in the background, and the
recognized text on top of the image.
Note: any recognition mistakes will be visible in this format.
 Image-Text. This file type is most commonly used. It contains
two layers: the recognized text, and the original image on top of
the text. This way, you have both access to the recognized text
and you still see the original image.
Note: since the image covers the text, any recognition mistakes will
not be visible.