I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 42)

Readiris TM 14 – User Guide
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 Select Color and 300 DPI as preferences to obtain optimal
results.
When you are scanning business cards or Asian languages it is
recommended to use a scanning resolution of 400 dpi.
 Then select the Page Analysis options
See General Processing Options for more information.
 Click the Scan button in the dialogue box to start scanning
documents.
Note: pay attention to line skew. Line skew over 0.5°
increases the risk of OCR errors.
Tips:
- Sometimes Twain scanners display white text on a black background when
scanning in black-and-white. To avoid this, click Preferences on the
Readiris menu. Then click the Scanner tab and select Invert Black &
White images from TWAIN scanners.
- To scan batches of documents, see the sections Automatic Processing and
Watched Folder.