Re: Graphics contrast - critical principle

Alistair,

Example 2 in here is really confusing me.  Can you explain how this 
differs from 1.4.3 as I believe the text in this image is already 
covered by WCAG.

Regards,

James


On 12/5/2016 6:58 AM, Alastair Campbell wrote:
>
> Hi everyone,
>
> Thanks for all the feedback on Information graphics contrast [1, 2]. 
> There is one principle involved, which if agreed, means we can refine 
> the wording and continue.
>
> Several people noted the difficulty with testing contrast on complex 
> graphics which have multiple colours, which is true on the face of it.
>
> I think there is a reasonable way to approach this, which I tested by 
> presenting it to 8 people in our design team. They didn’t go pale or 
> get angry, and after a couple of examples it seemed quite reasonable.
>
> We obviously haven’t conveyed it in the SC text well enough yet, but 
> if a few of the respondents could read this and think through the 
> objections, I think we can clear that stumbling block:
>
> https://alastairc.ac/tests/graphics-contrast-explanation.html
>
> The nub of it is that the test should be: *For each element of a 
> graphic required for understanding, it is discernible.*
>
> That is very different from contrast-testing every combination of 
> elements, and IMHO much more feasible.
>
> In that page I work through a couple of the examples to show what’s 
> needed. It is also worth noting that the current “1.4.1 Use of Color“ 
> catches most current “difficult” examples, the contrast aspect would 
> help catch the remaining ones.
>
> I’ve worked through a dozen examples [3], I’m happy to tackle more so 
> long as they pass the color-alone SC and are different from ones I’ve 
> already done.
>
> Kind regards,
>
> -Alastair
>
> 1] https://github.com/w3c/wcag21/issues/9 
> <https://github.com/w3c/wcag21/issues/9>
>
> 2] https://www.w3.org/2002/09/wbs/35422/NewSC_20161122/results#xq2
>
> 3] https://alastairc.ac/tests/graphic-contrast-test.html 
> <https://alastairc.ac/tests/graphic-contrast-test.html>
>

-- 
Regards, James

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