I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 59)

Readiris TM Corporate 12 – User Guide
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characters have the same width, or proportional, in which case the
characters have a different width.
To select the character pitch:
 On the Settings menu, point to Character Pitch.
 The character pitch is set to Automatic by default.
 Click Fixed if all characters of the typeface have the same width.
This is often the case in old typewriter documents.
 Click Proportional if the characters of the typeface have a
different width. Virtually all fonts in newspapers, magazines and
books are proportional.
Important: these document characteristics do not apply to Asian or to
Hebrew documents.
U SING INTERACTIVE LEARNING
Readiris offers an interactive learning function. By means of
Interactive learning you can train the recognition system on fonts
and character shapes, and correct the OCR results if necessary.
During interactive learning, any characters the recognition system
isn't sure of are displayed in a preview window, in combination with
their parent word and the proposed solution.
Interactive learning can substantially enhance the accuracy of the
recognition system and is particularly useful when recognizing
distorted, defaced forms. Interactive learning can also be used to