I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 125)

How To
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If the scanned documents are too bright, or too dark, Readiris will
have trouble recognizing them. Luckily there is a feature that
allows you to adjust the quality of scanned documents. See the
section Adjusting the Image Quality to learn how to do so.
 the scanner settings
If you are using a scanner to scan documents, the image quality
is also linked to the scanner settings. See the section Scanning
Documents and General Processing Options to make sure the
right settings have been selected for your scanner.
Make the scan resolution is set to 300 dpi for regular documents
and to 400 dpi for small print and Asian languages.
H
OW TO PROCESS DIGITAL CAMERA IMAGES
Readiris automatically detects when images have been made by a
digital camera and uses special recognition algorithms to process
them.
To open digital camera images:
 Click File on the top toolbar.
 Select your digital camera images and click Open.
 In the page thumbnail, you see a little camera icon, which
indicates Readiris recognizes the image as digital camera image.