I am working on converting an image pdf that was created from screen captures to rtf for my husband. The original pdf is close to 200 pages. It took me 6 hours to prep the pdf for my OCR software because there were a lot of graphics that needed to be excluded. It took the OCR software about 45 minutes to process with me sitting there and making corrections when the software wasn't sure. So far I've spent 12 hours editing in Word and I still have several dozen errors to fix. The rtf file is 80+ pages. It also includes about a dozen graphic files that had to edited to view properly in the rtf.
That is an extreme example but I've spent 20 hours proofing google scans after they were OCRed so preparing a good digital file is not a trivial exercise. But I still don't see how anyone can say the costs of paperbook and digital book are the same. Once you get a good rtf it can be easily converted to any number of formats.
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