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Old 10-29-2023, 11:33 AM   #1
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Unhappy PDF to EPUB don't keep OCR
Hello,
I am using the last version of Calibre and I have a PDF with an OCR so I can search text in it.

When converting to Epub, the OCR disappeared.

How can I kepp my PDF OCR in the EPUB ?

Thank you
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Old 10-29-2023, 12:26 PM   #2
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Extract the OCR. There are separate tools depending on OS.

Also don't convert PDFs at all, except by OCR or scraping OCR into a wordprocessor.

PDFs are an end use format to print or print preview.
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Old 11-03-2023, 03:35 AM   #3
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Hello thank you for your message, the thing is that I have scanned a book into multiples jpeg and I would like to convert to epub and pdf.

Should I convert to epub first? Because the tools I'm using with ocr recognition is for pdf only, I didn't find the way to make an ocr from my original jpeg files in Calibre
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Old 11-03-2023, 10:44 AM   #4
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Quote:
Originally Posted by Slash View Post
the tools I'm using with ocr recognition is for pdf only, I didn't find the way to make an ocr from my original jpeg files in Calibre
If you are using Linux, a cool way to do OCR on jpeg images is OCRFeeder as a front end for Tesseract. It gives you fine control, handles paragraphing and end-of-line hyphens very well. Lets you do double-column and other ugly things.

If you have a pdf with OCR text in it, Calibre will use the pdftohtml tool to extract the text. Sometimes this does not work, for some reason, so try using the pdftotext tool outside Calibre. That will give you a text file, but you are on your own for paragraphing and formatting...as always with pdf.

Anything OCR'd needs proofing and editing, an that is usually the hardest part of the project.
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Old 11-04-2023, 11:37 AM   #5
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unfortunately i am using windows
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Old 11-04-2023, 02:37 PM   #6
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https://tesseract-ocr.github.io/tess...-3rdParty.html
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Old 11-04-2023, 02:59 PM   #7
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Quote:
Originally Posted by Slash View Post
Hello thank you for your message, the thing is that I have scanned a book into multiples jpeg and I would like to convert to epub and pdf.

Should I convert to epub first? Because the tools I'm using with ocr recognition is for pdf only, I didn't find the way to make an ocr from my original jpeg files in Calibre
There is a thread discussing ocr conversions which is probably worth a read.
Here is my post in that thread that details my workflow and links to software you need...
https://www.mobileread.com/forums/sh...93#post4341993
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Old 11-04-2023, 03:44 PM   #8
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unfortunately i am using windows
Well, tesseract can be run on windows (I'm sure I did years ago), also Linux is free and can even be run from a USB stick.
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