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106 lines
4.6 KiB
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[#]: subject: (Use gImageReader to Extract Text From Images and PDFs on Linux)
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[#]: via: (https://itsfoss.com/gimagereader-ocr/)
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[#]: author: (Ankush Das https://itsfoss.com/author/ankush/)
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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Use gImageReader to Extract Text From Images and PDFs on Linux
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======
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_Brief: gImageReader is a GUI tool to utilize tesseract OCR engine for extracting texts from images and PDF files in Linux._
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[gImageReader][1] is a front-end for [Tesseract Open Source OCR Engine][2]. _Tesseract_ was originally developed at HP and then was open-sourced in 2006.
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Basically, the OCR (Optical Character Recognition) engine lets you scan texts from a picture or a file (PDF). It can detect several languages by default and also supports scanning through Unicode characters.
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However, the Tesseract by itself is a command-line tool without any GUI. So, here, gImageReader comes to the rescue to let any user utilize it to extract text from images and files.
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Let me highlight a few things about it while mentioning my experience with it for the time I tested it out.
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### gImageReader: A Cross-Platform Front-End to Tesseract OCR
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![][3]
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To simplify things, gImageReader comes in handy to extract text from a PDF file or an image that contains any kind of text.
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Whether you need it for spellcheck or translation, it should be useful for a specific group of users.
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To sum up the features in a list, here’s what you can do with it:
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* Add PDF documents and images from disk, scanning devices, clipboard and screenshots
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* Ability to rotate images
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* Common image controls to adjust brightness, contrast, and resolution
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* Scan images directly through the app
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* Ability to process multiple images or files in one go
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* Manual or automatic recognition area definition
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* Recognize to plain text or to [hOCR][4] documents
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* Editor to display the recognized text
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* Can spellcheck the text extracted
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* Convert/Export to PDF documents from hOCR document
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* Export extracted text as a .txt file
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* Cross-platform (Windows)
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### Installing gImageReader on Linux
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**Note**: _You need to explicitly install Tesseract language packs to detect from images/files from your software manager._
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![][5]
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You can find gImageReader in the default repositories for some Linux distributions like Fedora and Debian.
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For Ubuntu, you need to add a PPA and then install it. To do that, here’s what you need to type in the terminal:
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```
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sudo add-apt-repository ppa:sandromani/gimagereader
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sudo apt update
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sudo apt install gimagereader
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```
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You can also find it for openSUSE from its build service and [AUR][6] will be the place for Arch Linux users.
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All the links to the repositories and the packages can be found in their [GitHub page][1].
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[gImageReader][1]
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### Experience with gImageReader
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gImageReader is a quite useful tool for extracting texts from images when you need them. It works great when you try from a PDF file.
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For extracting images from a picture shot on a smartphone, the detection was close but a bit inaccurate. Maybe when you scan something, recognition of characters from the file could be better.
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So, you’ll have to try it for yourself to see how well it works for your use-case. I tried it on Linux Mint 20.1 (based on Ubuntu 20.04).
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I just had an issue to manage languages from the settings and I didn’t get a quick solution for that. If you encounter the issue, you might want to troubleshoot it and explore more about it how to fix it.
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![][7]
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Other than that, it worked just fine.
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Do give it a try and let me know how it worked for you! If you know of something similar (and better), do let me know about it in the comments below.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/gimagereader-ocr/
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作者：[Ankush Das][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/ankush/
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[b]: https://github.com/lujun9972
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[1]: https://github.com/manisandro/gImageReader
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[2]: https://tesseract-ocr.github.io/
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[3]: https://i0.wp.com/itsfoss.com/wp-content/uploads/2021/03/gImageReader.png?resize=800%2C456&ssl=1
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[4]: https://en.wikipedia.org/wiki/HOCR
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[5]: https://i0.wp.com/itsfoss.com/wp-content/uploads/2021/03/tesseract-language-pack.jpg?resize=800%2C620&ssl=1
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[6]: https://itsfoss.com/aur-arch-linux/
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[7]: https://i0.wp.com/itsfoss.com/wp-content/uploads/2021/03/gImageReader-1.jpg?resize=800%2C460&ssl=1
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