WebAIM - Web Accessibility In Mind

E-mail List Archives

Re: Colour contrast standard


From: Alastair Campbell
Date: Oct 22, 2007 7:40AM

On 10/16/07, Mike Osborne - AccEase < <EMAIL REMOVED> > wrote:
> Are these numbers arbitrary or is one right and the other wrong? Is 500 too
> much or is 400 inadequate?

I seriously doubt there is a real answer to that, for most people the
HP one is fine, but I'm sure there are some who benefit from very high

It is a sliding scale, and you could argue that those with a need for
extreme contrast should have tools (e.g. user style sheets / Opera /
system tools) that provide that regardless of what the site does.

If you look at the colour range allowed by the W3C one, it doesn't
give you a whole lot of flexibility in the design, although I'm not
sure how the WCAG 2 algorithm varies from version 1? I'm under the
impression it's not directly comparable, although I'll check with a
colleague who put together some tools based on it.

Kind regards,