This is called optical character recognition (OCR). When you scan, you get a
picture of a page. That picture may have something that looks like words in
it. OCR software looks at the picture and tries to guess what the word is.
Some guesses are better than others. The software has become much better but
it is rare that a long document that goes through OCR will come through the
other end perfect.
Scanners usually come with some OCR software.
You are always better off working from the original Word file that produced
the document than scanning a printed version.
--
Charles Kenyon
Word New User FAQ & Web Directory:
http://addbalance.com/word
Intermediate User's Guide to Microsoft Word (supplemented version of
Microsoft's Legal Users' Guide)
http://addbalance.com/usersguide
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