Re: Color contrast (Minimum)

This is one of the problems of images of text.  If you have an image of text and it meets the contrast ratio but then change the system display settings you can make something unreadable.

The current SC doesn’t take display settings into account, so if it meets 4.5:1 (or 3:1 if applicable) then it passes.  That doesn’t mean that it will address the needs of all users and in all circumstances, in fact you can be assured that it doesn’t, but it would meet the WCAG SC currently.  We are discussing how to improve this on the Low Vision Task Force.

Thanks,
AWK

Andrew Kirkpatrick
Group Product Manager, Standards and Accessibility
Adobe

akirkpat@adobe.com
http://twitter.com/awkawk


From: "Ta, Duc" <duc.ta.740@my.csun.edu<mailto:duc.ta.740@my.csun.edu>>
Date: Tuesday, August 16, 2016 at 13:53
To: Andrew Kirkpatrick <akirkpat@adobe.com<mailto:akirkpat@adobe.com>>
Cc: WAI-IG <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Subject: Re: Color contrast (Minimum)

The actual color is dark red background and the text is red. However, when I check black and white mode, it turns out to be that so i am not sure whether I should consider it as a failure or I will say it is decent and move on.


Best,
Duc Ta

On Tue, Aug 16, 2016 at 1:29 PM, Andrew Kirkpatrick <akirkpat@adobe.com<mailto:akirkpat@adobe.com>> wrote:
I measured the contrast on your example and it is 1.27:1.  That certainly fails, and probably isn’t the right example for a question about whether 3:1 is sufficient…

Thanks,
AWK

Andrew Kirkpatrick
Group Product Manager, Standards and Accessibility
Adobe

akirkpat@adobe.com<mailto:akirkpat@adobe.com>
http://twitter.com/awkawk


From: "Ta, Duc" <duc.ta.740@my.csun.edu<mailto:duc.ta.740@my.csun.edu>>
Date: Tuesday, August 16, 2016 at 10:19
To: WAI-IG <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Subject: Color contrast (Minimum)
Resent-From: WAI-IG <w3c-wai-ig@w3.org<mailto:w3c-wai-ig@w3.org>>
Resent-Date: Tuesday, August 16, 2016 at 10:19

Hi,

I have a question. I know large text that pass color contrast ratio of 3:1 would pass the color contrast. Is it possible to consider this as failure if it is barely readable with black and white or color blinded people?

Example
[Inline image 1]



Best,
Duc Ta



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Duc Ta

IT Consultant

Tel:   (323) 412-4894

www.dtaconsulting.org<http://www.dtaconsulting.org>