APCA Documentation 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. This repository is for the documentation, for issue tracking, and for the discussion forum.
TOOLS
CODE
The correct code to use is apca-w3 which is in its own satellite repository, and is also available at npm i apca-w3 That is the only code that should be used for any development purposes.
DESIGN GUIDELINES
The draft independent APCA Readability Criterion is up as a work in progress, still sections to be added and/or adjusted.
FORUMS
For comments or questions on the guidelines, use the ARC forum, that is where we discuss the draft standards & guidelines, and discuss legal & conformance issues.
For comments or questions on theory, math, or the APCA algorithm itself, use the SAPC-APCA forum here, please post all comments, questions, or discussions regarding theory, math, code, third-party tools,third-party tools, and so forth, 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.
- APCA Main Documentation (READ ME): The repo basic readme file for an overview and quickstart.
- APCA Documentation Index: An index of relevant APCA documentation.
- APCA Formula 0.9.98g4g: 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 Minimum Compliance for Developers: Standards for what can be called APCA™.
- APCA FAQ: Just starting, so few QA yet.
The SAPC APCA GitHub Main Repository
You are here
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.
