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RE: WCAG meeting December 6, 2016

From: Bailey, Bruce <Bailey@Access-Board.gov>
Date: Tue, 6 Dec 2016 14:00:08 +0000
To: WCAG <w3c-wai-gl@w3.org>
Message-ID: <CY1PR08MB13091260C6190F0DAEFDA6B7E3820@CY1PR08MB1309.namprd08.prod.outlook.com>
My apologies, but I anticipate being late to join the call.  I have completed the survey.

I will be especially sorry if I miss the discussion on of contrast for images.  Here are a couple data points though:

1)  Mathematically, on a plane you can have as many as four colors touching.  [1]
2)  With our desired 4.5:1 contrast ratio, you can only manage three colors, and your choices are limited to  (1) white-or-almost-white, (2) black-or-almost-black, and (3) a few thousand shades of gray (including greenish gray, reddish grey, bluish grey).

I found an old data dump from October 2008 that lists them all (it is 4.5 mb though).
Darkest RGB value tested:  rgb(96,96,96).
Lightest RGB value tested:  rgb(144,144,144). 
Number of values tested:  117649. 
Number of values found to have a contrast ratio of 4.5:1 or higher against both white and black:  9259.

[1] http://en.wikipedia.org/wiki/Four_color_theorem

From: Andrew Kirkpatrick [mailto:akirkpat@adobe.com] 
Sent: Monday, December 5, 2016 7:47 AM
To: WCAG <w3c-wai-gl@w3.org>
Subject: WCAG meeting December 6, 2016

The WCAG WG will be meeting on Tuesday, 6 December 2016 at 11AM Eastern US (Length: up to 90 minutes). 

Please reply with regrets to the list.
Scribe list: https://www.w3.org/WAI/GL/wiki/Scribe_List

IRC: irc.w3.org<http://irc.w3.org/>  port: 6665 channel #wai-wcag

1. Charter discussion and changes
2. Survey of new SC proposals: https://www.w3.org/2002/09/wbs/35422/NewSC_20161122/

To connect to the meeting:
Join WebEx meeting (https://mit.webex.com/mit/j.php?MTID=m064eab3e5485b640231a7fe56dc4785c)
Meeting number:            642 418 206
Meeting password:         Find in the irc meeting room header if you don’t know it


Join by phone
+1-617-324-0000 US Toll Number
Access code: 642 418 206

Andrew Kirkpatrick
Group Product Manager, Standards and Accessibility


Received on Tuesday, 6 December 2016 14:01:29 UTC

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