RE: Issue 9: Informational Graphic Contrast (Minimum)

Thanks Alastair –

So are you proposing that all colors within the graphic need to meet the 4.5:1 color contrast ratio unless they meet the requirements to have a 3:1 color contrast?

Kathy
CEO & Founder
Interactive Accessibility

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From: Alastair Campbell [mailto:acampbell@nomensa.com]
Sent: Monday, November 21, 2016 9:17 AM
To: WCAG <w3c-wai-gl@w3.org>
Subject: Re: Issue 9: Informational Graphic Contrast (Minimum)


Hi,



For anyone looking at the last agenda item (new SC survey), the second item (Issue 9) isn’t well formatted on github (yet).



There was a comment already about how to test multi-colored graphics, which I think is answered, but is easily missed on the current github description.



A better formatted version is here in the meantime:

https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/Informational_Graphic_Contrast_(Minimum)



The short answer is that: Any ‘graphical element’ needed for understanding has to be discernible from its surroundings, whether that is background or adjacent elements. There are many ways of doing that, whether it is removing the need for it to be understood (e.g. adding a label), or borders, or patterns.



There is a set of examples with workings here:

https://alastairc.ac/tests/graphic-contrast-test.html




Kind regards,



-Alastair