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I get no more than average results with 300DPI, especially with older paperbacks. With 400DPI my OCR errors are drastically reduced.
The better/cleaner the source, the better the result. However, keep in mind that the OCR software has to 'guess' a lot of stuff, like paragraphs, outlining, etc. That is where the post-processing comes into play. That is why I created my Word add-in to help me with that and greatly reduce the time I would need for the postprocessing.
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