Datashare
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  • About Datashare
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  • Concepts
    • Running modes
    • CLI stages
  • About ICIJ
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  • 💻On your computer
    • About the local mode
    • Install on Mac
      • Start Datashare
      • Add documents to Datashare
    • Install on Windows
      • Start Datashare
      • Add documents to Datashare
    • Install on Linux
      • Start Datashare
      • Add documents to Datashare
    • Install with Docker
    • Add documents
    • Add more languages
    • Install plugins and extensions
    • Neo4j
      • Install Neo4j plugin
      • Create and update Neo4j graph
  • 🌐On your server
    • About the server mode
    • Install with Docker
    • Add documents from the CLI
    • Add entities from the CLI
    • Authentication providers
      • OAuth2
      • Basic with a database
      • Basic with Redis
      • Dummy
    • Neo4j
      • Install Neo4j plugin
      • Create and update Neo4j graph
    • Performance considerations
  • ⚡Usage
    • Search documents
    • Search documents in batch
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    • Filter documents
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    • Explore a document
    • Star documents
    • Tag documents
    • Recommend documents
    • Keyboard shortcuts
    • Create a Neo4j graph and explore it
    • FAQ
      • General
        • Can I use Datashare with no internet connection?
        • Can I download a document from Datashare?
        • Can I remove document(s) from Datashare?
        • Do you recommend OS or machines for large corpuses?
        • Can I use an external drive as data source?
        • How can we use Datashare on a collaborative mode on a server?
        • How can I contact ICIJ for help, bug reporting or suggestions?
        • Why results from a simple search and a batch search can be slightly different?
        • How can I uninstall Datashare?
        • Advanced: how can I do bulk actions with Tarentula?
        • What should I do if I get more than 10,000 results?
        • How to run Neo4j?
      • Definitions
        • What is a named entity?
        • What are NLP pipelines?
        • What is fuzziness?
        • What are proximity searches?
      • Common errors
        • 'Your search query is wrong.' What should I do?
        • Searching with double quotes doesn't work
        • List of common errors leading to "failure" in Batch Searches
        • What if Datashare says 'No documents found'?
        • Nothing works, everything crashes. What can I do?
        • What if tasks are 'running' but not completing?
        • 'You are not allowed to use Docker, you must be in the "docker-users" group'. What should I do?
        • What if a 'Preview' of my documents is 'not available'?
        • What do I do if Datashare opens a blank screen in my browser?
        • I see people, organizations and locations in the filters but not in the documents
        • What does 'Windows named pipe error' mean?
        • Datashare doesn't open. What should I do?
        • I upgraded to version 9 of Datashare and it fails.
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    • Introduction to Tarentula
    • Index operations with Playground
    • Write extensions
    • Write plugins
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Datashare is an open source project by the International Consortium of Investigative Journalists

On this page
  • Install packages on Linux
  • Install packages on Mac
  • Install languages on Windows
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  1. On your computer

Add more languages

This page will explain to you how to install language packages to support Optical Character Recognition (OCR) on more languages.

Last updated 11 months ago

To be able to perform OCR, Datashare uses an open source technology called Apache Tesseract. When Tesseract extracts text from images, it uses "language packages" especially trained for each specific languages. Unfortunately, those packages can be heavy and to ensure a lightweight installation of Datashare, the installer doesn't use them all by default. In the case Datashare informs you of a missing package, this guide will explain you how to manually install it on your system.

Install packages on Linux

To add ocr languages on linux, simply use the following command:

sudo apt install tesseract-ocr-[lang]

Where `[lang]` is can be :

  • all if you want to install all languages

  • a language code (ex: fra, for French), the list of languages is available

Install packages on Mac

The Datashare Installer for Mac checks for the existence of either or , which packages managers are used for the installation of Tesseract. If none of those two package managers is present, the Datashare Installer will install MacPorts by default.

With MacPorts (default)

First, you must check that MacPort is installed on your computer. Please run in a Terminal:

port version

You should see an output similar to this:

If MacPort is installed on your computer, you should be able to add the missing Tesseract language package with the following command (for German):

port install tesseract-deu

Once the installation is done, simply close and restart Datashare to be able to use the newly installed packages.

With Homebrew

If Homebrew was already present on your system when Datashare was installed, Datashare used it to install Tesseract and its language packages. Because Homebrew doesn't package each Tesseract language individually, all languages are already supported by your system. In other words, you have nothing to do!

If you want to check if Homebrew is installed, run the following command in a Terminal:

brew -v

You should see an output similar to this:

Install languages on Windows

*Additionnal languages can be also added during Tesseract's installation.

The list of installed languages can be checked with Windows command prompt or Powershell with the commandtesseract --list-langs.

Datashare has to be restarted after the language installation.

If you get a command not found: port, this either means you are using Homebrew (see next section) or you did not yet.

The full list of supported language packages can be found .

If you get a command not found: brew error, this mean Homebrew is not installed on your system. You might either use MacPorts (see previous section) or on your computer.

Languages packages are available on Tesseract . Trained data files have to be downloaded and added into tessdata folder in Tesseract's installation folder.

💻
run the Datashare installer for Mac
on MacPorts website
run the Datashare installer for Mac
Github repository
here
MacPorts
Homebrew
Download and add French into tessdata
French is listed in installed languages
French is available for OCR
Tessdata folder
list-langs command
French added to ocr languages