270013 - contrast control

Status: RESOLVED WONTFIX

(Core :: SVG, enhancement)

Description

[jonathan chetwynd]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8a5) Gecko/20041103 Firefox/0.9.1+
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8a5) Gecko/20041103 Firefox/0.9.1+

people with poor vision, learning difficulties or other disabilities will
benefit from a contrast control.

http://www.peepo.co.uk/style/contrast.svg is a rather crude interpretation,
appropriate to my coding skills.


Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Actual Results:  
contrast of the graphic is controllable by the user.

Expected Results:  
slider or other method to change contrast

following a 37 minute discussion* on irc with various experts it was resolved
that this is a user agent issue, and it was suggested that I bring this to your
attention. I can help with assessment of the control, but perhaps do not have
the  skills to help create.

There is a need for accessibility and user agent guidelines, in the interim,
there are limited possibilities.

There are OS controls for contrast, however my experience is that SVG offers
greater possibilities than those which might be applied across current OS

It would also be helpful to have a single document which demonstrates some of
these advantages better than http://www.peepo.co.uk/style/contrast.svg does.

* http://svg.jibbering.com/svg/2004-11-15.html#T15-45-41

Comment 1

[jonathan chetwynd]

http://www.w3.org/TR/WAI-USERAGENT/guidelines.html#gl-conventions

"incorporating operating environment-level user preferences into the 
user agent. For instance, some operating systems include settings that 
allow users to request high-contrast colors "

however I would expect SVG to offer enhancements that OS wouldnt currently be
able to offer. for instance the latest mac accessibility beta includes a
contrast control, with white on black option. this provides complementary
colours*, which may not be that useful, visions of black suns rising over
distant planets.

whereas for instance this example uses black, neutral or white as a background,
changes the stroke, but leaves the content unchanged. I sincerely hope and
imagine that a lot more can be provided given time and care.

similarly I would hope to see a range of other people's concepts made real thru
SVG documented examples. that way we can speed up contrast accessibility and
usability testing.

relying on OS and UA developers to get it right, has a long lead time, and
without guaranteed results as users aren't normally too involved in the
programming development.

cheers

*tested here: http://www.euman.dk/vis/farve.html

Comment 2

[jonathan chetwynd]

Techniques For Accessibility Evaluation And Repair Tools
http://www.w3.org/TR/AERT#color-contrast
formulas for colour difference and brightness (text specific?)

Comment 3

[Hixie (not reading bugmail)]

Note: It isn't fully clear what a "contrast control" is and what would be
considered enough to consider this bug fixed.

Comment 4

[Gervase Markham [:gerv]]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
highly unlikely to be the source of a fix to the code.

While your input is very important to us, our resources are limited and so we
are asking for your help in focussing our efforts. If you can still reproduce
this problem in the latest version of the product (see below for how to obtain a
copy) or, for feature requests, if it's not present in the latest version and
you still believe we should implement it, please visit the URL of this bug
(given at the top of this mail) and add a comment to that effect, giving more
reproduction information if you have it.

If it is not a problem any longer, you need take no action. If this bug is not
changed in any way in the next two weeks, it will be automatically resolved.
Thank you for your help in this matter.

The latest beta releases can be obtained from:
Firefox:     http://www.mozilla.org/projects/firefox/
Thunderbird: http://www.mozilla.org/products/thunderbird/releases/1.5beta1.html
Seamonkey:   http://www.mozilla.org/projects/seamonkey/

Comment 5

[jonathan chetwynd]

I can't help that no one is working on this bug

Comment 6

[Jonathan Watt [:jwatt]]

Robert, what do you think of this? It seems to me that this should be something provided by the operating system, not on an application by application basis. Windows and Mac both seem to provide such a feature:

http://www.microsoft.com/windowsxp/using/accessibility/highcontrast.mspx
http://www.apple.com/accessibility/macosx/vision.html

Comment 7

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I don't think there's anything we can do here better than what the OS can do. It's hard to figure out what was requested here since most of the links are 404 now.

Comment 8

[Jonathan Watt [:jwatt]]

Without strong arguments for why the operating system facilities are insufficient, and without clear details on exactly what we could do that would be better, I'm closing this as wontfix.