I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 43)

Readiris TM Pro 12 – User Guide
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Despeckling removes small spots from black-and-white images.
 Click Apply to preview the results.
 If the results are satisfactory, click OK. If not, change the
settings again.
 Click Recognize + Save to recognize the document.