[Irl-dean] Color contrast and WCAG 2.2 priority?

[Paul Walsh, Segala]

Look at you! Thanks Gez.

It doesn't help the Web 2.0 folk though; most of the associated colours
fail. I think we're going to see a lot of alternatives coming up.

Cheers,
Paul

-----Original Message-----
From: irl-dean-admin at list.eeng.dcu.ie
[mailto:irl-dean-admin at list.eeng.dcu.ie] On Behalf Of Gez Lemon
Sent: 17 January 2007 15:11
To: irl-dean at list.eeng.dcu.ie
Subject: Re: [Irl-dean] Color contrast and WCAG 2.2 priority?

Hi Paul,

On 17/01/07, Paul Walsh, Segala <paul at segala.com> wrote:
> *Personally* I really dislike the threshold for these particular points,
> they are way too strict for my liking. Moreover, they are more strict than
> HP's guidelines (no time to dig out references sorry!), which has a lot of
> experience in this area.

The algorithm you're referring to was just a suggested algorithm by
AERT, and never became a recommendation. The algorithm was based on
the YIQ colour space previously used by the NTSC television standard,
and wasn't appropriate for the web. I think the new luminosity
contrast ratio algorithm included in the draft of WCAG 2.0 is much
better in this regard, as it's derived from the Standard Color Space
for the Internet [1], which HP were involved with.

[1] http://www.w3.org/Graphics/Color/sRGB

Best regards,

Gez

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