The WCAG contrast requirements are flawed. Here's what a new approach could mean for data visualizations.

A tool that brings attention and understanding to how color contrast can affect people with different visual impairments.

Color & Contrast is an interactive guide to color for designers.

Actionable tips on how to nail WCAG 2.1 color compliance.

Get random, accessible color combinations

Before color-contrast(), stylesheet authors needed to know accessible colors ahead of time. Often a palette would show black or white text on a color swatch, to indicate to a user of the color system which text color would be needed to properly contrast with that swatch.

WCAG 3 will use a new color contrast method called APCA (Advanced Perceptual Contrast Algorithm).It's a big improvement over the current system but there are a lot of changes to get your head around.🧵 pic.twitter.com/yLbujn3hG4— Dan Hollick 🇿🇦 (@DanHollick) December 9, 2021

The APCA Advanced Perceptual Contrast Algorithim SIMPLE VERSION.

Look at the image above. Don’t you feel some colors are brighter than others? For example, between the yellow and blue: which is brighter?

Accessible Palette is an app for building color systems with consistent lightness and predictable contrast ratios across color levels.

The W3C Accessibility Guidelines (WCAG) 3.0 provide a wide range of recommendations for making web content more accessible to users with disabilities. Following these guidelines will address many of the needs of users with blindness, low vision and other vision impairments; deafness and hearing loss; limited movement and dexterity; speech disabilities; sensory disorders; cognitive and learning disabilities; and combinations of these. These guidelines address accessibility of web content on desktops, laptops, tablets, mobile devices, wearable devices, and other web of things devices. They address various types of web content including static content, interactive content, visual and auditory media, and virtual and augmented reality. The guidelines also address related web tools such as user agents (browsers and assistive technologies), content management systems, authoring tools, and testing tools.

Look at the image above. Don’t you feel some colors are brighter than others? For example, between the yellow and blue: which is brighter?

… an easy to use, open-source, native colour picker for macOS. Pika makes it simple to quickly find colours onscreen, in the format you need, so you can get on with being a speedy, successful designer.

This site shows such schemes, developed with the help of mathematical descriptions of colour differences and the two main types of colour-blind vision. A colour scheme should reflect the type of data shown.

A macOS app for quick access to WCAG color contrast ratios → https://itunes.apple.com/de/app/contrast-color-accessibility/id1254981365?l=en&mt=12

Colors that look and work great for everyone

The Colour Contrast Analyser (CCA) helps you determine the legibility of text and the contrast of visual elements, such as graphical controls and visual indicators.

Empowering designers with beautiful and accessible color palettes based on WCAG Guidelines of text and background contrast ratios.

For people with impaired vision, we are required to ensure that there is a minimum amount of contrast between our foreground and background colors. formulas for determining optimum color contrast. W3C's specification on color contrast... hp color palette. style sheet text colors. style sheet text colors.

Low-contrast font color and unreadable texts? To hell with them!