[willus]

Originally Posted by MarjaE

Here, volume 1 of Soviet Russia gives spectacularly bad ocr results in English, and the 1st issue of volume 3 completely failed to ocr:

https://www.marxists.org/history/usa/pubs/srp/index.htm

Here, volumes 1 and 2 completely failed to ocr in Russian:

http://militera.lib.ru/h/antonov-ovs...a01/index.html

For the first case, you need to specify this option:

-ocrcol 2

E.g. k2pdfopt -mode copy -ocrcol 2 -ocr t myfile.pdf

That will get k2pdfopt to correctly OCR a 2-column document where you only want OCR applied. I've attached an OCR of page 100.

Not sure what's wrong with the antonov documents--I tried OCR-ing in Russian and it did work, though it had a number of mistakes.

k2pdfopt -mode copy -ocrlang rus -ocr t myfile.pdf

You can add the -p option to quickly test just one page of conversion, e.g.

k2pdfopt -mode copy -ocrlang rus -ocr t -p 95 myfile.pdf

I've attached this conversion as well (physical page 95). You might seriously consider getting Office 365 if you do this kind of thing a lot. I loaded one of the Russian volumes into MS Word and it did a remarkably good job converting it to Russian text. I've attached a screen shot of page 90 loaded into MS Word, with some text selected, along with a graphic of the same page directly from the original PDF file.