Thread Subject: Group A: 21(j) provide a range of contrastlevels
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From: Andi Snow-Weaver
Date: Thu, Oct 19 2006 10:05 AM
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Current Section 508 wording:
21(j) When a product permits a user to adjust color and contrast settings,
a variety of color selections capable of producing a range of contrast
levels shall be provided.
Jim Tobias commented on the wiki about this one:
"There are some algorithmic approaches to the issue of color pairs and
contrast. Do they address real human performance issues, or are they
purely mathematical? That is, just looking at colorblindness, are there
color pairs that would fail an automated test but not interfere with
anyone's real life performance?"
The ISO standard contains only recommendations, not normative requirements,
for this and it is equally as vague as 508.
ISO: software that includes colour schemes should provide colour schemes
designed for use by people who have visual impairments.
ISO: Software that uses colour schemes should allow users to create, save,
and individualise colour schemes, including background and foreground color
combinations.
WCAG 2.0 has a provision that includes an algorithmic approach:
WCAG 2.0: Text or diagrams, and their background, have a luminosity
contrast ratio of at least 5:1.
Andi
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