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contrast in video

From: Jim Allan <jimallan@tsbvi.edu>
Date: Thu, 22 Apr 2010 11:57:58 -0500
To: "'Geoff Freed'" <geoff_freed@wgbh.org>
Cc: "'WAI-UA list'" <w3c-wai-ua@w3.org>
Message-ID: <005b01cae23c$f5cd7b80$e1687280$@edu>
Geoff,
UAAG20 has a success criteria
4.9.11 Adjust Playback Contrast and Brightness.  User has ability to control
the contrast and brightness of the content within the playback viewport.

Most standalone player have a contrast control. We were wondering if you
knew of any contrast requirements for accessibility of video?
I know WCAG has them for text. I doubt they will apply to video. 
Some folks with vision problems have contrast issues. Television and
monitors allow contrast and brightness adjustment so users can adjust their
monitor to meet their viewing preferences. Perhaps, we need something like
adjustment to 50% higher or 50% lower than what is delivered in 1%
increments.

Thoughts? 

Jim Allan, Accessibility Coordinator & Webmaster
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315    fax: 512.206.9264  http://www.tsbvi.edu/
"We shape our tools and thereafter our tools shape us." McLuhan, 1964
Received on Thursday, 22 April 2010 16:58:45 GMT

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