There is a free OCR engine, which they say would possibly be running  
on Mac OS X:

http://code.google.com/p/tesseract-ocr/

The quality is quite "good" for my taste; I know this because I'm  
using it from time to time
(it is the core OCR engine of a commercial software PDFpen costing  
about 50 USD).
(* Note also that PDFpen has a serious problem when OCR a big PDF file,
more than 100 pages. *)

Once I tried briefly the Tesseract engine itself.  It compiled on my  
Mac OS X (10.5.5 back then)
with no problem, but unfortunately, the resulting program didn't work.
It may require a bit of code hacking to make it run on Mac.

mahn-soo


On Jan 14, 2009, at 7:12 AM, Noam A. Osband wrote:

> So, a common problem I have with Skim is that I can't highlight or  
> underline text in a file. This happens with scanned files,  
> apparently because the letters come up as an image and not text. An  
> OCR program can fix this. they are expensive. Anyone know a good one  
> for free for a Mac?
>
> thanks!

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