DaltonLens aims at simplifying the life of color blind people with utility software and technical blog posts.

Software

DaltonLens for Desktop

Utility for macOS, Windows and Linux. It runs as a tray program, always at your fingertip with a global Ctrl+Alt+Win+Space shortcut. It can then show color information below the pointer, capture a screen area and apply a range of color filters on it. It also has a tool to highlight pixels with similar colors which is especially useful to read color-coded charts and plots.

• Last update: v2.4 (December 7, 2021)
• Download on the Windows 10 App Store
• Download for older Windows
• Download on the mac App Store
• Download for Linux
• Source code on github

Online Color Blindness Simulator

An extensive comparison of color blindness simulation methods, right in the browser. Use the predefined images or upload your own. It is based on the careful implementations of DaltonLens-Python. Also check the related Review of Open Source Color Blindness Simulations.

DaltonLens-Python

Toolbox for research and development on color vision deficiency algorithms. It includes various implementations of color blindness simulators and tools to generate Ishihara-like plates and visualize confusion lines. It is used to create the technical posts as Jupyter notebooks and tries to match the color perception theory as accurately as possible.

• Source code on github

libDaltonLens

Single-file, public domain C library implementing some reference color vision deficiency simulation algorithms. It is meant to be easily copied/adapted.

• Source code on github

Posts

• Review of Open Source Color Blindness Simulations

  There are lots of available programs for color blindness simulation, but many are actually very inaccurate. Let's find out what methods we can trust and what code can be safely copy/pasted :)

  Oct 19, 2021

• Understanding LMS-based Color Blindness Simulations

  Diving deeper in the theory of Viénot, Brettel & Mollon's method to understand what's behind the scene.

  Oct 21, 2021

• Accurate SVG filters for color blindness simulation

  Protanopia and deuteranopia are easy to implement with a single matrix multiplication, but tritanopia requires special care and a more subtle pipeline. Let's see how we can still implement the state-of-the-art approach of Brettel et al. with SVG filters.

  Nov 25, 2021

• Evaluating Color Blindness Simulations

  How well does a simulation model match my perception? What severity do I have for that model?

  Oct 25, 2021