SAPC-APCA
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Myndex
APCA (Accessible Perceptual Contrast Algorithm) is a new method for predicting contrast for use in emerging web standards (WCAG 3) for determining readability contrast. APCA is derived form the SAPC (...
APCA GitHub Repo
Welcome!
APCA is the Accessible Perceptual Contrast Algorithm, a new way to predict contrast for text and non-text for content on self illuminated displays.
Questions? Ask in our Discussions Forum
This is also where we discuss draft guidelines and proposals. Please post all comments or discussions here and not in the satellite repositories so they can be tracked and resolved.
DOCUMENTATION
- Main Readme Doc This page includes the math, code walkthroughs and links for developer related goodies. If you'd like to dive into the deep end, this is a good start.
Simple Overview, QuickStart, and FAQ
These are intended for end users, and those interested in a plain language overview without a lot of the math & theory.
- Why APCA? A basic overview
- APCA in a nutshell The minimum user guide
- APCA FAQ
Sciency Stuff!
Maths! Vision Science! Photons on Parade!
- The base APCA-W3 formula in LaTeX math for your viewing and calculating pleasure.
- Regarding Exponents Is delta-gamma some kinda frat house? Nope... It's math.
- Standard Observer Model The setting for a mathematical eyeball.
- Visual Contrast Draft Whitepaper Almost as tasty as a draft beer!
APCA Resources, Articles, & Links
The main catalog of related articles, peer reviews, repositories, white papers, and more!
APCA Linktree
Smaller, selected link collection.
Myndex Research on Twitter
Local Repo Documentation
- Why APCA: A brief plain language overview of APCA and readability contrast.
- APCA in a Nutshell: Quick overview of levels, use cases, and font sizing.
- READ ME: The repo basic readme file for an overview and quickstart.
- Repo List: A list of specific versions of APCA, Bridge PCA, and support files.
- Standard Observer Model: Draft Standard Observer.
- Important Change Notices: General Change History (see individual repos for specifics)
- Regarding Exponents: Notes on the exponents used in APCA.
- Accessibility Statement: A statement for beta testers and early adopters to use place on sites using APCA
- APCA FAQ: Just starting, so few QA yet.
The SAPC APCA GitHub Main Repository
You are here 🔽 this index page is served at the github repo.
The APCA-W3 GitHub Repo
Over there is the W3 licensed version, and it's the same as the published npm package.
The Bridge-PCA GitHub Repo
The BridgePCA is backwards compatible with WCAG 2, and it's the same as the published npm package.
The ColorParsley GitHub Repo
ColorParsley is a micro library for auto parsing color strings of all kinds, also on npm.
APCA Contrast Calculator
The canonical demo tool at Myndex
Bridge PCA Contrast Calculator
Try out the Bridge PCA tool at Myndex
Myndex CVD Simulator
Color insensitive vision simulation (aka colorblind). Includes deuteranopia, protanopia, tritanopia, and blue cone monochromacy/achromatopsia.
Myndex Perception Research
Demos and Experiments relating to the project.
Myndex