Re: [Rswg] on color Re: Fwd: I-D Action: draft-carpenter-rswg-rfc7996-issues-00.txt

[Martin Thomson <[e-mail]>]

There are accessibility tools that provide contrast metrics[1].  Those can be used to select appropriate colours.  However, those are only tools.  You have to take a number of factors into account, especially things like size (of fonts or diagram object) as smaller items can require more contrast to be readable.

Color is hard.  I do think we can do a limited palette, but after seeing the diagrams people have started to add, I'm thinking that we'll need some pretty strong editorial policies to avoid having to contend with a garish mash of styles, even if they are still accessible.  Note however that this isn't advocating for enforcement of those policies via profiles, except as necessary to achieve specific ends.

For example, I can imagine technical enforcement of a limited palette, but that would be technical enforcement of an editorial policy, not a statement about what capabilities are needed to display the image, which is what I think any RFC 7996 replacement needs to focus on.

[1] e.g., https://webaim.org/resources/contrastchecker/


On Wed, Sep 7, 2022, at 11:31, Brian E Carpenter wrote:
> On 06-Sep-22 18:03, Eliot Lear wrote:
>> Brian, Nevil, all,
>> 
>> I'm someone who likes color, but I recognize that people often do color
>> wrong (perhaps myself included).   I have a question: do there exist
>> industry-accepted profiles of SVG that specifically address
>> accessibility and would otherwise meet our publication needs?  Could we
>> otherwise establish an acceptable palette and contrast rules?  I'm sure
>> some of this was discussed as rfc7996 was developed.
>
> No doubt, but it's an area where real expertise is needed, I think.
>
> https://www.color-blindness.com/coblis-color-blindness-simulator/ is a 
> nice tool, but unfortunately it doesn't know about SVG. You have to 
> save the diagram as .png etc.
>
>    Brian
>
>> 
>> Eliot
>> 
>> On 06.09.22 07:23, Brian E Carpenter wrote:
>>> Hi,
>>>
>>> This draft aims to prepare for a discussion of the SVG profile for
>>> RFCs by listing the known issues. (NOT solutions, in this draft.) We
>>> really want to hear about issues that we've missed, and any other
>>> comments, of course.
>>>
>>>     Brian & Nevil
>>>
>>>
>>> -------- Forwarded Message --------
>>> Subject: I-D Action: draft-carpenter-rswg-rfc7996-issues-00.txt
>>> Date: Mon, 05 Sep 2022 22:09:20 -0700
>>> From: [e-mail]
>>> Reply-To: [e-mail]
>>> To: [e-mail]
>>>
>>>
>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>>
>>>
>>>          Title           : Known issues with the IETF SVG profile
>>>          Authors         : Brian E. Carpenter
>>>                            Nevil Brownlee
>>>    Filename        : draft-carpenter-rswg-rfc7996-issues-00.txt
>>>    Pages           : 5
>>>    Date            : 2022-09-05
>>>
>>> Abstract:
>>>     This document lists a number of issues observed in practice by
>>>     authors attempting to include SVG diagrams in RFCs following the
>>>     profile established by RFC7996.
>>>
>>>
>>> The IETF datatracker status page for this draft is:
>>> https://datatracker.ietf.org/doc/draft-carpenter-rswg-rfc7996-issues/
>>>
>>> There is also an HTML version available at:
>>> https://www.ietf.org/archive/id/draft-carpenter-rswg-rfc7996-issues-00.html
>>>
>>>
>>>
>>> Internet-Drafts are also available by rsync at
>>> rsync.ietf.org::internet-drafts
>>>
>>>
>>> _______________________________________________
>>> I-D-Announce mailing list
>>> [e-mail]
>>> https://www.ietf.org/mailman/listinfo/i-d-announce
>>> Internet-Draft directories: http://www.ietf.org/shadow.html
>>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>>>
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