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I used apt-get to install Tesseract but it's not really working. Maybe I could just download binaries somewhere, put in a dir and use this way?

What's wrong with my Tesseract now:

tesseract --help
tesseract:Error:Usage:tesseract imagename outputbase [-l lang] [configfile [[+|-]varfile]...]

and

tesseract test.tif out2.txt -l pol
Unable to load unicharset file /usr/share/tesseract-ocr/tessdata/pol.unicharset

I have downloaded and unpacked Polish language into the dir above, but the only pol.* is pol.traindeddate.

0

In your case you should install also the Polish language support using apt:

sudo apt install tesseract-ocr-polsudo apt search tesseract-ocr-*

For other language list language packages and select the one than is matching your language:

 sudo apt search tesseract-ocr-*

Example for Romanian:

sudo apt search tesseract-ocr-* | grep "Romanian" -b1

will give

7900-tesseract-ocr-ron/xenial,xenial 3.04.00-2 all
7946:  tesseract-ocr language files for Romanian
7990-

and then

sudo apt install tesseract-ocr-ron

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