OCRmyPDF
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ocrmypdf
Preserve hypertext links
Problem: Output files from OCR (output-type=pdf or pdfa, without or without -f, without or without -c) lose hypertext links associated to text (e.g. hyperlinks for table of contents entries, inline footnote numbers, inline endnote numbers that jump to page, footnote text, or endnote text). Text in output file is no longer hyperlinked.
Solution: Preserve hyperlinks so that text in output file is hyperlinked as defined in input file.
Thank you for an amazing tool!
Can you provide a file that demonstrates this and the command line you used?
There are multiple ways software can create a hyperlink in a PDF.
On Thu., Jul. 30, 2020, 13:47 Phil Agee, [email protected] wrote:
Problem: Output files from OCR (output-type=pdf or pdfa, without or without -f, without or without -c) lose hypertext links associated to text (e.g. hyperlinks for table of contents entries, inline footnote numbers, inline endnote numbers that jump to page, footnote text, or endnote text). Text in output file is no longer hyperlinked.
Solution: Preserve hyperlinks so that text in output file is hyperlinked as defined in input file.
Thank you for an amazing tool!
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Attached is a file created using the following command line:
ocrmypdf -f
Clicking on the entry for chapter one in the table of contents does not navigate to page where the chapter begins.
pride-and-prejudice-ocrmypdf.pdf .
Thanks!
By design --force-ocr is going to discard hyperlinks and other active content. A major use case of this feature is getting as much content out of possible out of damaged PDF files, such as those that have missing Unicode tables. (This feature is not well named, I admit, but it's also hard to describe in a word or two.)
I would still like to look at the case without --force-ocr. Do you have the original input file, before processing with ocrmypdf? It looks like you send me the one after processing. I'd like to compare to see what got dropped along the way.
Attached is the original.
I tried converting without any options and got the notice about already existing text (PriorOcrFoundError: page already has text!). So I then added --force-ocr.
--force-ocr is going discard hyperlinks, that is intended behavior.
If you use --skip-text to skip OCR on pages that already have printable text (i.e. all pages on this file), and --output-type pdf to disable PDF/A conversion, the hyperlinks appear and still work.
It seems that Ghostscript's PDF/A conversion removes links, even with -dPrinted=false which as explained here should prevent links from being deleted.
I suppose my answer needs to be that, if you want to keep hyperlinks, use --output-type pdf instead of the default. I don't think I will escalate this to Ghostscript.
I can confirm that --skip-text and --output-type pdf preserve the hyperlinks.
Thank you again for making and supporting this extremely useful tool!
I have a .pdf that contains on nearly every page text and a picture. Only applying --output-type pdf destroys the ToC's hyperlinks, its required to do --skip-text. Which leads to the situation that nothing is ocr'd ... Thanks for your tool, i really appreciate that, but thats unfortunately a killer for me :/
ocrmypdf 20HS_AFM_Zusammenfassung.pdf 20HS_AFM_Zusammenfassung.ocr.pdf --output-type pdf --skip-text
Scanning contents: 100%|█████████████████████| 95/95 [00:00<00:00, 399.12page/s]
Start processing 16 pages concurrently
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OCR: 100%|██████████████████████████████| 95.0/95.0 [00:00<00:00, 2896.16page/s]
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JPEGs: 0image [00:00, ?image/s]
JBIG2: 0item [00:00, ?item/s]
Optimize ratio: 0.99 savings: -0.7%
Image optimization did not improve the file - discarded
also the .docx has ~30mb, the regular .pdf has about 11mb, when i ocr'd it (with --force-ocr), it has ~70mb (600% bigger).
i installed 11.7.0 of ocrmypdf and did that command with --redo-ocr, the ToC is clickable, awesome!! Thanks! And also the size is the same as the libreoffice generated .pdf, perfect!
