- From: Charles McCathieNevile <charles@w3.org>
- Date: Thu, 21 Jun 2001 06:21:10 -0400 (EDT)
- To: WAI GL <w3c-wai-gl@w3.org>
We talked mostly in broad terms. these are my notes... --------------- Some references we should look for / at: SVG access note - http://www.w3.org/TR/SVG-access (the drafting of it goes to http://www.w3.org/1999/09/SVG-access if people want to see our spelling mistakes and other thoughts) bell labs did a lot of studies on illustrating manuals. photos have a lot of distracting detail, and line drawings are more helpful. Action Adam Reed to find reference Paper by robert ephraim on visual agnoses - many people cannot identify objects in colour, but can with a line drawing. The icon dicussion on IG http://lists.w3.org/Archives/Public/w3c-wai-gl/2001AprJun/0255 and following messages Gunnar Hellstrom did good work with sign language telecommunication http://www.omnitor.se (frame rates and so on. ) Also worked on this in Deaf Australia Online projects - action CMN find reference GJR National Braille Press have done work on how to describe for the blind - we have reference on list archives. Aaron marcus http://www.amanda.com graphic sommunication and graphic interfaces Jakob nielsen http://www.useit.com "usability expert" ---------------------- Technique stuff (general, not specific techniques) colour disabilities: red-green only greyscales diminishing perception of blue - we think there are more that we need to find. Action Lisa Seeman there are people who cannot distinguish brightness consistency in styles distinct in colours distinct shape icons should not require complex processing of the representation. we need to remove everything one after the other - colour, brightness, outline only colour can be processed quickly, so it is useful to keep it there Shape is good too motion is fastest and draws attention colour is faster than outline for binary choices, light/dark may be faster than colour - find out... action Jan Richards sound can reinforce, but MUST be in sync vertical/horizontal orientation can be immportant - a few degrees of misorientation can make a big difference to how people percieve. Symmetry is an important factor. layout of "moving" components is important subtitling is difficult because sign language syntax is different, so synchronisation is hard. searching and finding pieces in sign tracks is difficult, but there are techniques to put metadata and hotspots. we are discussing how to divide so you can switch from written to signed subtitles and back. Action Antti - show this tomorrow how it works. placement is very important for signing, then colour, rights management is important in the case of artistic material. AR2 relationships can be expressed in 2d media through proximity or order (reading order - can vary according to the "standard local" writing system) encoding relationships can allow us to transform the representation ---------------Other notes that might remind people of something - probably not worth reading. traffic lights - distinguished by position and brightness AR2 There are people who cannot distinguish brightness cognitive component of vision - mose people don't know about agnosia (like CMN until now) we should look at perception research we need colour disability information agnosia can include motion - people cannot identify motion facial agnosia size of a clip can vary widely. removing colour seems to be helpful for faster processing (open question) socially, sign language is important, like different "natural languages" metadata, subtitiling speech signing content... It is an art to write what is there in a picture. project - take some photos and ask people to describe them (short and long descriptions) and see what happens as the pictures are degraded. Any work like that been done? navigation: map type of navigation vs tables of images. -- Charles McCathieNevile http://www.w3.org/People/Charles phone: +61 409 134 136 W3C Web Accessibility Initiative http://www.w3.org/WAI fax: +1 617 258 5999 Location: 21 Mitchell street FOOTSCRAY Vic 3011, Australia (or W3C INRIA, Route des Lucioles, BP 93, 06902 Sophia Antipolis Cedex, France)
Received on Thursday, 21 June 2001 06:21:10 UTC