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Re: Graphics contrast

From: Jim Allan <jimallan@tsbvi.edu>
Date: Thu, 10 Nov 2016 07:32:32 -0600
Message-ID: <CA+=z1WntXDaG7ioG_wSDtBDfpkiWVwGEuSk6fAtnj8z3j0=YUg@mail.gmail.com>
To: Alastair Campbell <acampbell@nomensa.com>
Cc: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>
Great news. Always good to have the view of folks who have to implement an

On Nov 10, 2016 4:22 AM, "Alastair Campbell" <acampbell@nomensa.com> wrote:

> Hi everyone,
> I disrupted our design team’s meeting this morning to run this SC past
> them and see if it was understandable and feasible.
> At least with the description I gave it (primarily around what ‘important
> information’ meant) they all though it was quite reasonable.
> The examples from the page were really helpful, so I think we should pick
> three or four to use in the description and/or techniques.
> One of the team also provided an example of how to shrink a large icon
> down whilst retaining a 3px stroke width, which I’ve added to the
> description:
> https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/Informational_Graphic_
> Contrast_(Minimum)#Description
> The main technique for icons is stroke thickness if the contrast is
> between 3 and 4.5 to 1.
> The three main techniques that jumped out as most useful for charts and
> diagrams were:
> - Labels, the most useful across various circumstances, especially for
> avoid colour-alone issues.
> - Borders, trickier to do but useful in some cases.
> - Patterns, trickiest to get right as you also run into contrast issues
> there unless you have labels.
> There are some examples (like topographical maps) where you cannot have
> strong contrasting lines, so the key there would be to convey what is
> needed through labels or explanations outside of the graphic. E.g. label
> the top of a hill, or explain the implications in text.
> Most importantly nobody panicked, so I think we’re almost there!
> -Alastair
Received on Thursday, 10 November 2016 13:33:07 UTC

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