How can I underline with Koreader for SCAN-PDF

Kobo-SH · 03-10-2023, 06:49 AM

Hello everyone, I have a problem with underline words in a scan-pdf. Can someone help me to solve the problem. Thanks a lot!

In pic, the pen located under Auckland but the words above were marked.

pazos · 03-10-2023, 08:03 AM

You need to apply OCR to your PDF. Always better to do it in your computer. Might be mandatory if your ereader is android based: https://github.com/koreader/koreader/issues/8068

Kobo-SH · 03-10-2023, 08:08 AM

Quote:

Originally Posted by pazos

You need to apply OCR to your PDF. Always better to do it in your computer. Might be mandatory if your ereader is android based: https://github.com/koreader/koreader/issues/8068

Thanks. I will try it at once. But with the Kobo Reader i can underline on the word which I want. But the PDF will be adjusted everytime when I turn the page.

pazos · 03-10-2023, 01:30 PM

Quote:

Originally Posted by Kobo-SH

Thanks. I will try it at once. But with the Kobo Reader i can underline on the word which I want. But the PDF will be adjusted everytime when I turn the page.

You can do that in KOReader as well but you'll need to setup tesseract trained data first. It is already explained in https://github.com/koreader/koreader...-scanned-pages

IMHO it is easier and faster to do a proper OCR on a computer and save cpu cycles on your ereader. Also a proper pdf with a text layer should be way smaller than the same pdf as a bunch of scanned pages.

Kobo-SH · 03-12-2023, 07:02 PM

Quote:

Originally Posted by pazos

You can do that in KOReader as well but you'll need to setup tesseract trained data first. It is already explained in https://github.com/koreader/koreader...-scanned-pages

IMHO it is easier and faster to do a proper OCR on a computer and save cpu cycles on your ereader. Also a proper pdf with a text layer should be way smaller than the same pdf as a bunch of scanned pages.

I used Adobe and saved pdf again. Afterwards I can underline the right words in the pdf.

03-10-2023, 06:49 AM	#1
Kobo-SH Member Posts: 10 Karma: 10 Join Date: Mar 2023 Device: KOBO Elipsa, Forma, Boox M92, M96, N96, Max, Pocketbook P740	How can I underline with Koreader for SCAN-PDF Hello everyone, I have a problem with underline words in a scan-pdf. Can someone help me to solve the problem. Thanks a lot! In pic, the pen located under Auckland but the words above were marked. Attached Thumbnails

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03-10-2023, 08:03 AM	#2
pazos cosiñeiro Posts: 1,406 Karma: 2451781 Join Date: Apr 2014 Device: BQ Cervantes 4	You need to apply OCR to your PDF. Always better to do it in your computer. Might be mandatory if your ereader is android based: https://github.com/koreader/koreader/issues/8068

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