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Review of Open Issues for 1.4

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Tue, 29 Nov 2005 23:27:33 -0600
To: <w3c-wai-gl@w3.org>
Message-ID: <003801c5f56e$c9091330$ee8cfea9@NC6000BAK>
Here are the open issues for 1.4

8 can be closed due to current wording

1 can be closed because suggestion is not technically possible today

Proposals are presented for last 4 to close them. 

Gregg

 

Suggests the following be CLOSED

*	344.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#344>  Algorithm for testing foreground/background contrast.

*	this one says we should have a success criterion regarding
foreground background contrast like the one we now have. 
*	Suggest we CLOSE this with comment "success criterion 1.4.1 and
1.4.3 now meet this need"

*	454.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#454>  sugg. test for contrast

*	This one says that a tool is in development but that algorithm isn't
complete.
*	Suggest we CLOSE this with comment "algorithm now exists in 1.4.1
and 1.4.3"

*	489.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#489>  how to objectively measure questionable contrast?

*	Need an algorithm that would make measuring contrast objectively
measurable.
*	Suggest we CLOSE this with comment "algorithm now exists in 1.4.1
and 1.4.3"

*	592.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#592>  what are "standard foreground/background contrast reqs."?

*	What are the "standard foreground/background contrast requirements"?
If  there are any, please clarify (and cite)
*	Suggest we CLOSE this with comment "algorithm now exists in 1.4.1
and 1.4.3"

*	996.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#996>  Codifying color contrast

*	Suggests a method for contrast. " When I read that text, the first
thing I thought of was finding the effective luminance of the two colors and
requiring some minimum separation."
*	Suggest we CLOSE this with comment "algorithm now exists in 1.4.1
and 1.4.3"

*	1699.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1699>  Take colorblindness into account when evaluating contrast

*	Two issues.  One is contrast if user has color blindness
*	Second is that no information shall built on that you have to be
able to see a certain color
*	SUGGEST CLOSING with message "Current algorithm in 1.4.1 and 1.4.3
takes color deficiency in to account by using luminosity"  and success
criterion 1.3.2 requires color not be only way to convey information

*	1719.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1719>  L2 SC2 is difficult to follow

*	All that is said by commenter is "1.4 L2 SC2 is difficult to follow"
*	Suggest we CLOSE this with comment "1.4 L2 SC2 (now 1.4.2) reworded
for clarity"

*	1736.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1736>  GL 1.4 L1 - should require colors to be visually discernible

*	Shouldn't there be a requirement for the colours to be visually
discernable? This does not protect against near identical shades of green
being used for both foreground and background. This also risks the
possibility of colour-blind users being unable to discern the foreground
from the background. [TWG]
*	SUGGEST CLOSING with message "Current algorithm in 1.4.1 and 1.4.3
takes color deficiency in to account by using luminosity contrast" 

Suggest we close the following item by rejecting it.

*	1528.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1528>  Question about example

*	suggested example: as it is possible with graphics to change the
contrast, it is possible (if the speech was recorded separately, or not,
thanks to sound processing algorithms) to let the end user choose whether
(s)he wants the background sound a all, and leave the possibility to set the
contrast between the two.
*	Suggest CLOSING this with the comment "Unless content has separate
tracks for foreground and background sound this is not possible.  Since this
is not currently done with content (only with source tapes), nor do user
agents allow mixing of tracks, this would not be an option to users or
authors". 

Suggest we consider the following and close these items. 

*	892.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#892>  Readable fonts

*	JIS has a guideline that describes choosing default readable fonts.
Suggestion that we consider something similar
*	This is not yet addressed. 
*	Choices

*	Reject this suggestion as not being something we want to require. 
*	Add this as a level 3 success criterion
*	Add this as an advisory technique under 1.4.3  (because larger fonts
make it easier to tell text from background)

*	1522.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1522>  Criterion needed to address increasing font size

*	"At the 27 April 2005 Techniques Task Force of the WCAG WG telecon
[1], we determined that text magnification and reflow of content is not
addressed by existing success criteria. We felt it related best to this
guideline because it talks about consistent presentation and visual design.
There is concern about how large of a font developers should test with.
Someone should do research to determine the general rule of thumb for users
to move from using the browser to increase the font size to using
magnification software."
*	This is not yet addressed. 
*	Choices

*	Reject this suggestion as not being something we want to require. 
*	Add this as an advisory technique under 1.4.3 (or under the
guideline itself) 
*	"Testing their pages with increased font sizes up to 8 times default
to see if the content will enlarge and wrap appropriately." 

*	1706.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1706>  1.4 guideline text not general enough (should also mention
color)

*	Guideline 1.4 does not seem general enough, specifying images or
sound, but not colour (though colour is mentioned is the level 1 success
criteria).
*	SUGGEST we drop "images and sound from Guideline to change Guideline


*	FROM: Guideline 1.4 Make it easy to distinguish foreground
information from background images or sounds
*	TO  Guideline 1.4 Make it easy to distinguish foreground information
from background.

*	Then CLOSE this item with message " removed 'images and sound' to
meet this issue. 1707.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1707>  L1 SC seems a little weak

*	1737.
<http://trace.wisc.edu/bugzilla_wcag/issuereports/visual-audio-contrast_issu
es.php#1737>  GL 1.4 Example 1 - Overlaying text on an image may blend into
the darker area of the image

*	This one questions one of our examples where we have text over an
image.  
*	SUGGEST WE

*	Change example to say that "Area around lettering that is part of an
image is made lighter so that the letters contrast with the background
image" 
*	CLOSE ISSUE this with message  " Example changed to reflect fact
that lettering is part of image - not "text" displayed over an image. " 

 

 


Gregg

------------------------

Gregg C Vanderheiden Ph.D. 
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 
< <http://trace.wisc.edu/> http://trace.wisc.edu/> FAX 608/262-8848  
For a list of our list discussions http://trace.wisc.edu/lists/

 <http://trace.wisc.edu:8080/mailman/listinfo/>  

 

 
Received on Wednesday, 30 November 2005 05:27:48 GMT

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