4.7 Color changes: use texture or shapes in addition to colors

[cdpatnoe]

A best practice is to also use fill textures or different shapes in addition to colors.

[RealJoshue108]

@cdpatnoe can you please provide URLs to these best practices? Tnx

[cdpatnoe]

Here are some examples: https://www.brandeis.edu/web-accessibility/understanding/color.html

• Using Text Labels in Graphs
• Don't use color as the only way to convey content. You should also use direct text labels or changes in shape or texture. In the following example, the graph has its parts directly labeled, instead of relying on color matching with a legend. It also uses texture instead of color, to distinguish its elements. Although the graph below uses text labels and texture to differentiate between sections, you do not need to use both.

https://accessibility.umn.edu/core-skills/color-contrast#Never%20use%20color%20alone%20to%20show%20emphasis

• See chart example

https://material.io/design/usability/accessibility.html#color-and-contrast

• Other visual cues
  • For users who are colorblind, or do not see differences in color, other design elements can help express the same amount of information.
  • Because colorblindness takes different forms (including red-green, blue-yellow, and monochromatic), multiple visual cues help communicate important states. Elements such as strokes, indicators, patterns, texture, or text can describe actions and content.

Does this help?

C

On Tue, Jun 2, 2020 at 7:21 AM RealJoshue108 notifications@github.com wrote:

@cdpatnoe https://github.com/cdpatnoe can you please provide URLs to these best practices? Tnx

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <w3c/xaur#35>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHVXY4J4NLOCJK23CRNCJRTRUUDFVANCNFSM4LW7INLQ .

[RealJoshue108]

That is helpful @cdpatnoe we are discussing this now in Research Questions Task Force

[RealJoshue108]

This is potentially an interesting requirement that extends the existing WCAG SC 1.4.1 https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-without-color.html and something to consider in Silver (WCAG 3.0).

This goes beyond immersive XR.

[RealJoshue108]

This was discussed by Research Questions Task Force on https://www.w3.org/2020/06/10-rqtf-minutes.html#item02

[matatk]

For reference, from w3c/apa#55: Game Accessibility Guideline on not using colour alone—note the best practice examples at the end.