We are currently researching perceptual contrast for assessing legibility and accessibility on graphically rich web pages and computer displays. Below are links to some of the early live experimental pages, evaluating the issue(s) in detail.
All About APCA
APCA Articles, Documentation, & Reviews
This page contains an organized listing of articles, documentation, third party and peer reviews, code repositories, white papers, and more about the Accessible Perceptual Contrast Algorithm. Comments welcome at the GitHub repo!
A Short List of Key APCA Documents
The Myndex APCA Linktree has a short list of the most important understanding documents about perceptual contrast. And if you are new to APCA, the entry level overview is "Why APCA"
APCA Discussion Area
Have a question? We have answers! Please come and join the discussions at the APCA Forum.
WEB APPS & STUDIES
APCA Contrast Calculator
Color Vision Deficiency Simulation
We developed this web app to simulate how someone with Color Vision Deficiency** sees the world. We accurately simulate Protanopia, Deuteranopia, and Tritanopia using the Brettel '99 &'97 models. We also present some experimental models, such as Blue Cone Monochromacy. www.myndex.com/CVD/
**Color Vision Deficiency is sometimes referred to as "color blind,"
though that is not accurate except in some very rare cases.
The Web Perception Experiment
COMING SOON: a public study that you can be involved in! Currently under development, it will evaluate how people perceive content in real world situations. Stay-tuned here as we prepare to launch that project. Presently delayed due to COVID-19.
The need for a CSS x-height property demonstrator page
Text Zoom DEMO:
The need for proportional (and not percentage) zoom capabilities demonstrator page
Font Color Flip DEMO:
This demo illustrates the issues with a single "flip point" for flip a text color from black or white. See the interactive demonstration page
Luminance Contrast TUTORIAL:
This covers the basics of luminance contrast. Written before the invention of APCA, it covers the classic maths and concepts. Understanding Luminance Contrast
Please be advised: The below are archives of some of the very early experiments conducted on this project, being left here for legacy purposes. For the current state and more recent data, please see the SAPC-APCA GitHub Catalog of Resources.
CIRCA 2019 EXPERIMENTS
Most Recent Experiments First
These earlier experiments are set to offline to keep them from being crawled by bots in the interest of preventing confusion. Links availble on request.