Thread Subject: Re: Contrast
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From: Andi Snow-Weaver
Date: Tue, Aug 14 2007 11:05 AM
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We are requiring that software support the user preference settings in the
platform. If the platform doesn't have user settings, then we require
exactly what is required in Web.
<user preference provison>
Applications must provide a mode that utilizes platform settings for color,
contrast, font type, font size, and focus cursor. In the absence of
platform settings for color and contrast, all text (and images of text)
must have a contrast ratio of at least 5:1 except for unavailable items or
pure decoration. Large scale text (or images of large scale text) must
allow a contrast ratio of at least 3:1.
<end of user preference provision>
You can't require software to have a default contrast if there are user
preference settings in the platform that they also are required to support.
That would result in conflicting requirements.
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teitac-websoftwar < = EMAIL ADDRESS REMOVED =
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08/14/2007 11:51 Re: [teitac-websoftware] Contrast
Please respond to
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The software issue still remains however. The provision you cite only
covers software where it permits color and contrast adjustment. If the
software doesn't provide an adjustment -- then there are no contrast
provisions at all that apply.
Are we REQUIRING that software provide these adjustements somewhere and I
just missed them?
Gregg C Vanderheiden Ph.D.
> -----Original Message-----
> From: = EMAIL ADDRESS REMOVED =
> [mailto: = EMAIL ADDRESS REMOVED = ] On Behalf
> Of Andi Snow-Weaver
> Sent: Tuesday, August 14, 2007 11:35 AM
> To: TEITAC Web/Software Subcommittee
> Subject: Re: [teitac-websoftware] Contrast
> Sorry. I thought I picked "color schemes" terminology up from
> ISO but must not have been awake yet. Changed it. 
> Contrast ratio definition has not changed. 
> For software we have the User Preferences provision  and
> the Color adjustment provision .
>  http://teitac.org/wiki/EWG:Draft_July_18#Contrast_Ratio
> < = EMAIL ADDRESS REMOVED =
> u> "'TEITAC Web/Software
> Sent by: Subcommittee'"
> < = EMAIL ADDRESS REMOVED =
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> 08/14/2007 10:43 [teitac-websoftware]
> Please respond to
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> I'm confused by the new language.
> Proposed new text is very hard to understand. When I read
> it I think:
> - What is a color scheme?
> - If my color scheme meets this but I have
> individual words
> that are exceptions to the overall scheme - do those
> words have to
> - What is the definition of contrast? (same as old
> definition I assume but - not clear since not cited)
> - Why does large scale text have to meet a
> contrast ratio
> but only schemes for small text? (what is a scheme again?)
> Proposed language
> Color schemes for text (and images of text) specified in Web
> content, documents, or documents combined with presentation
> instructions (such as style sheets), must have a contrast
> ratio of at least 5:1, except if the text is pure decoration.
> Large-scale text or images of large-scale text must allow a
> contrast ratio of at least 3:1.
> 1) eliminate the "color schemes" part of it.
> 2) Change "such as style sheets" to "such as
> style sheets
> or commands" since "style sheets" makes it very
> specific and unclear
> if other means of specifying color would be covered.
> 3) Add "software" to the list of things covered.
> NOTE: We need to add another provision to cover software if
> we use this language - since it only covers content.
> 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/> FAX 608/262-8848 DSS Player at
> http://tinyurl.com/dho6b If Attachement is a mail.dat try
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