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SAPC-APCA
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 (S-LUV Advanced Predictive Color) which is an accessibility-oriented color appearance model designed for self-illuminated displays.apca-w3
The APCA version, to be licensed for use with guidelines: W3/AGWG.deltaphistar
𝜟𝜱✴︎ or Delta Phi Star is a variant method of determining lightness contrast, and a sibling of APCA and SACAM. It is a simplified version using easily invertible standardized maths, however it lacks some useful properties such as polarity sensitivity. In fact, it is intended for applications where a "general" simplifed perceptual contrast is desired, where polarity sensitivity is not needed (or is ambiguous).colorparsley
A lightweight but versatile mini-lib to parse color strings, objects, or numbers, returning a simple rgba array, and related string utilities. This was developed as part of the basic APCA distro.bridge-pca
A simplified version of the APCA math to bridge from WCAG_2 contrast math to the future, while being 100% backwards compatible with WCAG_2 contrast. By "backwards compatible" we mean if bridge-pca passes it, it will automatically pass WCAG_2 contrast.max-contrast
Send it the background color, returns black or white whichever is maximum Lc valueseelab
sRGB parsing and processing RGB data in and out of CIE XYZ, xyY, LAB and LUV, and more!Myndex
A catalog of Myndex Research content, including APCA articles & documentation, related code repositories, and resources.seestars
See Stars is a Myndex MicroColor Library. This has standard functions for the standard (piecewise) IEC conversion of sRGB to Y, and the CIE standard Y to L* (Lstar) and back again. The math & constants here reference those of CSS 4 for compatibility.brintness
brintness is an integer brightness/lightness/darkness calculationtinytrim
A set of CSS generic classes for on-the-fly adjustment of elements without having to use style="" — this CSS sheet is mainly for use in development and early design stages.AuralAccessibility
Aural Accessibility Research Project: A discussion area for ideas relating to guidelines for aural perception.ColorGlossy
A glossary of color, contrast, and vision termsIlluminated
A repo collecting the more substantial comments Myndex made regarding typography, CSS, color, contrast, and vision.TuttleAndButtle
Canonical rebuttals to sponsored rumors regarding APCA, APC-RC, BridgePCA, etc.Love Open Source and this site? Check out how you can help us