OCR'd text varies between Preview and Acrobat. Pointers?

Does anyone have a pointer to understanding how hidden text from character recognition works in .pdf files?
I have a number of files on which I have run OCR using Acrobat 8. What I find is that for some files, the "hidden text" is only readable by Acrobat (Acrobat 8 or Acrobat Reader), and not by Preview.
There are two differences. (1) in multiple column layouts, Acrobat will select one column, while Preview will select across columns. (2) sometimes text selected in Preview has lots of spaces inside of words, and spaces missing at word-breaks, while Acrobat will get the word breaks correctly.
Obviously, one solution is to only use Acrobat to read the files, but I like Preview. Also, programs that rely on Mac OS's built-in pdf facilities, like Papers, suffer from the same limitations as Preview.
I want to understand this problem better. Any clues?
Thanks
A
Message was edited by: alanterra

Further searching in google answered my own question. See http://www.betalogue.com/2007/07/13/mac-os-xs-preview-when-a-space-is-not-a-spac e/

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OCR'd text varies between Preview and Acrobat. Pointers?

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