Software for Enhancing the Legibility of Papyri
Updated 16 Jul 2021


Different papyri image enhancement made with the Hierax software

The purpose of this software is to enhance the legibility of papyri for text edition and publication. It consists of an image processing tool and an image viewer.


Fully automatic image enhancement, which is especially useful for processing image collections.

Multiple enhancement methods, for covering a variety of document and reproduction qualities, tasks, and subjective preferences.

Complementary to other software, such as DStretch and Photoshop.


  • app: Matlab (R2020b) app

  • code: Matlab (R2020b) source code

  • help: documentation (see also hierax.ch)

  • images: smaple papyri images

  • article: technical background (Vlad Atanasiu, Isabelle Marthot-Santaniello (2022), “Legibility Enhancement of Papyri Using Color Processing and Visual Illusions: A Case Study in Critical Vision”, International Journal on Document Analysis and Recognition (IJDAR), 25: 129–160, https://doi.org/10.1007/s10032-021-00386-0)

View Hierax on Matlab File Exchange

Cite As

Vlad Atanasiu (2024). Hierax (https://github.com/vladatanasiu/hierax/releases/tag/2021.03.30), GitHub. Retrieved .

MATLAB Release Compatibility
Created with R2020b
Compatible with R2020b and later releases
Platform Compatibility
Windows macOS Linux

Inspired by: Multiscale Retinex, multiWaitbar

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!
Version Published Release Notes

See release notes for this release on GitHub: https://github.com/vladatanasiu/hierax/releases/tag/2021.03.30


To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.