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Re: Color contrast (Minimum)

From: Andrew Kirkpatrick <akirkpat@adobe.com>
Date: Tue, 16 Aug 2016 19:31:28 +0000
To: Elizabeth Pyatt <ejp10@psu.edu>, "Ta, Duc" <duc.ta.740@my.csun.edu>, "IG - WAI Interest Group List list" <w3c-wai-ig@w3.org>
Message-ID: <55BCA42B-D982-44B9-A502-5B43F352F20A@adobe.com>
If the author provides the image with grey on red and the contrast is sufficient and the end user changes the display so that the brightness is too dim to tell some colors apart or selects an option that makes everything greyscale the contrast algorithm is unaffected.


Andrew Kirkpatrick
Group Product Manager, Standards and Accessibility


On 8/16/16, 15:20, "Elizabeth Pyatt" <ejp10@psu.edu> wrote:

>So what were the original color values for the reds? 
>I’m trying to understand how the contrast algorithm is effected when the example becomes black and white.
>If it’s a luminosity scale (i.e. values only are measured), then theoretically shifting or removing the hue should not matter. If it does, there is an issue that needs to be investigated.
>Hope this makes sense.
>> On Aug 16, 2016, at 3:06 PM, Andrew Kirkpatrick <akirkpat@adobe.com> wrote:
>> From: "Ta, Duc" <duc.ta.740@my.csun.edu>
>> Date: Tuesday, August 16, 2016 at 13:53
>> To: Andrew Kirkpatrick <akirkpat@adobe.com>
>> Cc: WAI-IG <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
>Elizabeth J. Pyatt, Ph.D.
>Instructional Designer
>Teaching and Learning with Technology
>Penn State University
>ejp10@psu.edu, (814) 865-0805 or (814) 865-2030 (Main Office)
>3A Shields Building
>University Park, PA 16802


Received on Tuesday, 16 August 2016 19:32:00 UTC

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