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Originally Posted by nezih
For reading absolutely it should be avoided, however there is no open source alternative to Adobe ClearScan.
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It doesn’t bother me at all which ocr software you wish to use, but for others who may be reading this, there isn’t really a huge benefit to Adobe ClearScan…
Adobe themselves say there is no increase in accuracy for using it… just a decrease in file size. If your end format is epub, then you do not really care about the pdf file size.
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Is OCR accuracy any different between ClearScan and Searchable Image styles?
No. The accuracy will be identical for input files of the same dpi. However, since a ClearScan files are so much smaller, you might consider using a 600 dpi input file as a starting point since there is little downside other than processing time.
Can I make changes to the text in a ClearScan file?
No. The Touchup Text Tool does not currently work on ClearScan files.
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If you want to avoid the hefty Adobe price/subscription then
there are other options… some free…. that provide just as good OCR. Take a look at GOCR, FreeOCR, or SimpleOCR… among many others. They can ocr directly from images/tiffs and you won’t need to go the pdf route at all - for that path lies the dark side…
When all is said and done, OCR is still not perfect no matter which software you use. You will still have to read and make manual corrections. The key is getting the clearest scan/image that you can to begin with. Please see the DIY Bookscanner site for in depth discussions about how to get the best scan.
Cheers!