FAQs

Is needed any other component before the Tesseract OCR component?

Yes, to configure the component properly, we recommend to use using a normalize mime type.

Is any preprocessing

required before the Tesseract OCR component?

Right now multipage tiff file is Currently, multipage TIFF files are not supported, so you need to split multipage tiff TIFF before the OCR process.

Can I have multiple Tesseract OCR versions installed?

We recommend that only 1 version is installed, since sometimes occasionally, the installations are not completed properly, as you will see in the next example.

Troubleshooting

Problem

You might get an NPE on the OCR process and if you enable the debug option, you'll find the real cause:

Error opening data file <path to Tesseract>/eng.traineddata Please make sure the TESSDATA_PREFIX environment variable is set to your "tessdata" directory.
Failed loading language 'eng' Tesseract couldn't load any languages! Could not initialize tesseract.

Solution

This could happen if you have multiple Tesseract installations, but you can use two approaches to solve this:

Either you don't have the proper language installed you are trying to use:

Or you might not have the TESSDATA_PREFIX variable correctly defined: