Error opening traineddata files on Mac High Sierra

[Firlefanz]

I downloaded deu_frak.traineddata Fraktur.traineddata and frk.traineddata to usr/loca/share/tessdata. But when using

$ tesseract file.tiff -l Fraktur Fraktur

I get the error message

Error opening data file ./tessdata/Fraktur.traineddata 

Please make sure the TESSDATA_PREFIX environment variable is set to the parent directory of your "tessdata" directory. Failed loading language 'Fraktur' Tesseract couldn't load any languages! Could not initialize tesseract.

[Zdenko Podobny]

First of all: your command if wrong. It should be constructed this way:

tesseract image output [options]

See tesseract --help for more details.

Next:  error message is clear:

Error opening data file ./tessdata/Fraktur.traineddata 

You (or your installation) instructed to look for trainneddata in current director (./). Do you have it there?

Next tesseract gave you hint how you can fix the problem (" Please make sure the TESSDATA_PREFIX..."). Did you use it?

Zdenko

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[Firlefanz]

Thank you for your reply. I used the command following this guide https://www.youtube.com/watch?v=QhJiOCwz-_I -- if it's wrong, then I will not follow this guide anymore.

Yes, I have Fraktur.traineddata in usr/loca/share/tessdata

I do not know how to change "the TESSDATA_PREFIX environment variable"

[Zdenko Podobny]

If you followed someone tutorial you should complain to its author ;-).

I am not familiar with Mac, but on linux you can do it (in command) this way:

 export  TESSDATA_PREFIX=/usr/loca/share/

Maybe it is similar on Mac. Try to google how to set environment variable on Mac.

Zdenko

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[Fanatico]

You installed it using brew or compiled it yourself?

try to type this in the terminal and post here the result

echo $TESSDATA_PREFIX

[Firlefanz]

Nothing happens if I type in echo $TESSDATA_PREFIX

I thought about installing tesseract 4.0beta, is there a step-by-step-guide how to do this? with brew install tesseract I cannot choose the version, i.e. it's 3.05.01

[Fanatico]

try this code in the console:

brew info tesseract

This must return some info, one these infos is the path where your tesseract is installed copy it and execute this code on your console:

export TESSDATA_PREFIX=[the path you just copied]

try to execute your code again, if it works you can past this code on you .bash_profile or use it in every new terminal you open

I made an step by step to build and use tesseract 4.0 on my mac you can see it here.

Obs.: Read everything before doing it

[Firlefanz]

It works! I am so relieved. Thank you all for the help.

Still I have a couple of questions since I've read a couple of tutorials, each using other commands:

1. Converting my Fraktur pdf files in tiff I use imagemagick. Is this the right command? convert -density 300 test.pdf -depth 8 -strip -background white -alpha off test.tiff

2. For tesseract then the command: tesseract test.tiff outtest -l deu_frak

With this I get a txt version of the tiff. 

3. Not that it matters too much (I'm over the moon that it works like this), can I get as an output instead of a txt the original pdf just with a search-and-copy-function?

[ShreeDevi Kumar]

1. Check the output tif and adjust convert command if needed

2. Depending on your tesseract version you could try -l frk also. 

3. Yes, you can get a pdf as output.

Search Github issues, there is a long discussion thread regarding best ways to create a pdf output.

Look for pdf and invisible pdf.

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[ShreeDevi Kumar]

https://github.com/tesseract-ocr/tesseract/issues/660

Regarding pdf

[Firlefanz]

Thank you again. I think I'll stay with plain txt -- pdf looks too difficult to achieve.

Now, next problem: Everything worked fine with my 1-page test pdf. I now tried to do the same with a 30 MB 500 pages pdf. After running convert -density 300 test.pdf -depth 8 -strip -background white -alpha off test.tiff it took 2 hours and then suddenly everything went black and I could not do anything. I guess my Mac is too weak to handle this. I guess splitting the pdf in many parts is the only option left? 

With pdftk I used the command "pdftk test.pdf burst" to split the pdf in single pages. I then put around 50 pages in a new folder and used "pdftk *.pdf cat output test.pdf" to combine them. Is there a faster way to do this? I do not know with which command I could split the 500 automatically in bundles of 50.