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Re: Graphics contrast

From: Glenda Sims <glenda.sims@deque.com>
Date: Thu, 3 Nov 2016 12:34:29 -0500
Message-ID: <CAH2ngETcmDuA7CuQ=Kq4eqqY_2pMvLVQpVr80Qny=Tq_HjP=8w@mail.gmail.com>
To: Alastair Campbell <acampbell@nomensa.com>
Cc: LVTF - low-vision-a11y <public-low-vision-a11y-tf@w3.org>
Great idea, Alastair.  +1

G

P.S.  And as a fall back position, we could add an option to provide an
easily findable "good contrast version" of an info graphic...as an
alternative.  My thought is...it would give designers a way to have more
flexibility (if needed)...while still have a fallback infographic with good
contrast...and hopefully, most designers would find that they prefer to
make only one version of the graphic because it is less work.



glenda sims    |   team a11y lead   |    deque.com    |    512.963.3773


*web for everyone. web on everything.* -  w3 goals

On Thu, Nov 3, 2016 at 11:56 AM, Alastair Campbell <acampbell@nomensa.com>
wrote:

> Hi Everyone,
>
>
>
> Immediately after the call I started putting Glenda’s update to the SC
> text in, and whilst doing that the similarity with the current 1.4.3 sprang
> to mind.
>
>
>
> How about aligning more closely with 1.4.3?
>
>
>
> ----------------
>
> The visual presentation of important information in graphical elements has
> a contrast ratio of at least 4.5:1 against the immediate surrounding
> background, except for the following:
>
>
>
>    - Thicker lines: where the minimum width of the line is at least 3px
>    the graphic has a contrast ratio of at least 3:1;
>    - Incidental: Graphical elements that are not required for the
>    understanding of the graphic, that are pure decoration, that have the
>    information duplicated elsewhere on the same page have no contrast
>    requirement;
>    - Logotypes: Graphics that are part of a logo or brand name have no
>    minimum contrast requirement.
>
> ----------------
>
>
>
> I went with “graphical elements” to open up the further description to
> sub-graphics, e.g. a line in an info-graphic is a graphical element, and if
> it is important then it should have contrast against its surroundings.
>
>
>
> As I said, if anyone has particularly good/bad examples of graphics please
> send them to me and I’ll try testing this against them.
>
>
>
> -Alastair
>
>
>
> --
>
>
>
> Alastair Campbell
>
>
>
> www.nomensa.com
>
> tel: +44 (0)117 929 7333 / 07970 879 653
>
> follow us: @we_are_nomensa or me: @alastc
>
>
>
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>
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Received on Thursday, 3 November 2016 17:35:03 UTC

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