jsColorblindSimulator
Simulate different kinds of color-blindness on images directly in your webbrowser. All the processing is done locally and the images do not leave your computer.
Try it here
About this project
This project is inspired by Coblis - the Color BLIndness Simulator. But instead of uploading the images to a server it does all the image processing locally in your webbrowser.
You can choose between 2 different Simulation Algorithms (Both are not proven to produce good or realistic results!):
The ColorMatrix Algorithm
From http://www.colorjack.com/labs/colormatrix/ (web.archive).
But there is this comment which claims to be from the author:
You're right, the ColorMatrix version is very simplified, and not accurate. I created that color matrix one night (http://www.colorjack.com/labs/colormatrix/) and since then it's shown up many places... I should probably take that page down before it spreads more! Anyways, it gives you an idea of what it might look like, but for the real thing...
As far as a simple script to simulate color blindness, this one does the best job:
http://www.nofunc.com/Color_Blindness_Library/ — It uses "confusion lines" within the XYZ color space to calculate values (this one is in Javascript, and should be easy to convert to python).
There are a few other methods, and no one really knows exactly what it would look like... these are all generalizations of a small sample, set against the masses.
The HCIRN Color Blind Simulation function
From http://www.nofunc.com/Color_Blindness_Library/ (web.archive).
The Color Blind Simulation function is
copyright (c) 2000-2001 by Matthew Wickline and the
Human-Computer Interaction Resource Network ( http://hcirn.com/ ).
It is used with the permission of Matthew Wickline and HCIRN,
and is freely available for non-commercial use. For commercial use, please
contact the Human-Computer Interaction Resource Network ( http://hcirn.com/ ).