I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 23)

Readiris TM Corporate 12 – User Guide
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Before you can use a Twain scanner, however, its drivers need to
be installed on your Mac.
Operation:
 Connect your scanner to your Mac and install the corresponding
drivers and/or software.
Test your scanner. If you experience any problems contact your
scanner manufacturer.
 Run Readiris.
 On the Readiris menu click Preferences.
 When the scanner drivers have been installed successfully, a list
of supported scanners will be available. Select your scanner
from the list.
Make sure you activate the option Enable Image Capture Scanners
when you are using an Image Capture scanner.
 A number of scanner and preprocessing options are available.
Refer to the section Scanning paper documents for more
information.