I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 32)

Chapter 5 – Scanning and opening documents
26
Calibrate
Click the Calibrate button should it be necessary to calibrate your
scanner.
Format
You can either choose an automatic scanning format or a custom
format for which you can indicate the page height and width.
Depth
Readiris supports black-and-white, grayscale and color images.
Resolution
Select a scanning resolution of 300 dpi.
When you are scanning business cards it is recommended to use a
scanning resolution of 400 dpi.
Invert image
Sometimes Twain scanners display white text on a black
background when scanning in black-and-white. To invert those
images select the Invert image option.
Note: this option is only available for Twain scanners.
 Several preprocessing options are available in the Preferences
window as well:
o You can choose to smoothen color and grayscale images.
During scanning this option renders grayscale and color images
more homogeneous by smoothening out differences in intensity. As
a result, a stronger contrast is created between the foreground (text)