A catalog of Myndex Research content, including APCA articles & documentation, related code repositories, and resources.


Accurate Contrast
Using the APCA


In an effort to pare down this mountain of material, here’s a link-tree of the key links, with the most basic at the top:

The Accessible Perceptual Contrast Algorithm

General Overview


Sciencey Stuff!

Maths! Theory! Vision Science! Photons on Parade!

For Developers

APCA Discussion Forum Threads

APCA Peer Review & Third Party Discussion

Peer reviews of APCA and third party
comparisons of APCA vs WCAG 2

There are several independent researchers evaluating APCA, and additional third party comparitive reviews that include demonstrations of the functional superiority to existing methods. The first two listed below are technical reviews by peers evaluating the APCA math and methods, and in comparison to WCAG 2 contrast methods and guidelines. APCA is open for peer review and discussion—please contact us if interested in performing an evaluation.

The problems of 4.5:1 as a target for a guideline not only impact those with impairments, but impact standard vision as well. WCAG 2 contrast SCs affect 100% of sighted users. The inherent problems with the WCAG 2 contrast math have been known for some time and widely critisized. Including studies by others showing that color insensitive types are not well served. The WCAG 2 contrast specs often cause enough problems for designers that it is ignored and today, some 86% of websites are failing WCAG_2 contrast per an automated survey—though some of these failures are not due to actual poor accessibility, but due to the perceptual inaccuracies of WCAG_2 contrast.

Myndex Web Apps

Myndex Color & Contrast Resources

On Readability & Contrast

General IT & Web

GitHub Gists

Mini articles on technical topics, with examples.

Contrast & Color Gists

A Listing of Significant Threads

These are some of the larger, in-depth issue threads & posts created on GitHub including the infamous thread #695. These posts contain useful information and research. Some of the information here may be superseded as some of these threads date back to the beginnings of the contrast research project.

Useful APCA Discussion Forum Threads

Myndex on Other Sites

Myndex is top 3% on Stack Overflow!
profile for Myndex on Stack Exchange, a network of free, community-driven Q&A sites

APCA—The Revolution Will Be Readable

The Lighter Side of Math & Photons…

The Art and Science of Applied Probability

In this career, I was using Applied Probability Methodologies for the Risk Assessment of short term ROI predictions related to high-variance cash-flow opportunities in finite-sized non-cooperative bidding groups where information is obliquely concealed as a function of multivariate strategies facilitating the predominately range-based tactics driven by randomized but nevertheless deterministic outcomes.

(…Sooo… this is more commonly known as Texas Hold ’Em Poker…)

For the record, Myndex is pronounced:

mind - ex

\ ˈmīn-ˌdɛks \

When George Eastman invented the word “Kodak” one of his criteria was that “it won’t be mispronounced”. I guess I missed that day. Ooops. —–

Welcome to the very bottom of the page!

Here at the very bottom of the page, we dare to ask the question, “do two lights make a dark?”

Also, just how many color scientists does it take to rotationally engage the helical conducting threads of an illumination apparatus further composed of a sealed, evacuated glass envelope containing a plurality of filament holders which electrically connect and physically support a coiled electrically conducting but resistive filament preferentially fabricated from a tungsten alloy to the aforementioned helical threads, engaging into a helical conducting receptacle, such that when an electrical power source of sufficient voltage and current is applied, said filament shall be caused to incandesce and emit visible irradiance?
A: The answer is “none” because they fell asleep reading this joke.