And don't usually scan text in grayscale, I've never found it increases ocr efficiency or accuracy.Ģ. I have found that anything higher generally confuses ocr programs and results in stupidly big files. scan books and other similar documents that are mainly text and not images (or not colour images) at 300dpi. So instead of all that, here is an alternative that works for me:ġ. You need to spend time at it, particularly with proofing, and some might say that can be accomplished only by one person reading the paper original text aloud while a second person follows the written form of the ocr copy (or by using TTS readers or some other workaround). Also the results are rarely perfect words get missed out or munged. Or they may just be images of pages without searchable text or text-only PDFs which have not been diligently proofed so they omit material, do not reflect original formatting and so on.Ĭonversely, making a good scanned document that contains only text and pictures (if any) rather than images of the pages themselves can be tricky and has a fairly steep learning curve. For instance, some pdfs are so large they cannot be read on portable ereaders successfully or at all. There are lots of good (mainly pdf) scans of books, documents etc out there but many times the result could have been better. text (and graphics among the text, if any) only, without images of the paper pages makes for much smaller pdf files, but requires a lot of careful work to get the right result.
images of the paper pages with a searchable/copiable text layer on top, either where the ocr program found the characters indistinct or uniformally for all irrespective of recognisability images of the paper pages with a searchable/copiable text layer hidden underneath images only of the paper pages of a book or document but I've worked with/ created pdfs which comprise All applications are for MS Windows but I think all or some of the apps named have Mac and *ix versions or analogs. The objective of this note is to provide an outline guide on how to produce reliable digitisations of old books or other documents without using a proprietary optical character recognition (ocr) software package. SUBJECT: How to make sensibly sized PDFs (with searchable text layer) of old books using free software.
draft only so far, it occurred to me to ask for comments here to weed out any obvious errors first - and in case anyone has a proven solution to the problem in #6, which I'm tentatively thinking may be fixed using the alternative image to PDF application below noted:
For someone wanting to do volume digitisations of old books.
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