[Bug 37603] Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits

Petr Tomeš ptomes at ubuntu.cz
Sat Apr 1 17:05:16 BST 2006


Public bug reported:

Affects: ubuntulooks (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed


Description:
Guideline 2.2 of the Web Content Accessibility Guidelines 1.0 requires
that foreground and background colour combinations provide sufficient
contrast when viewed by someone having colour deficits, or when viewed
on a black and white screen. Two colours provide good colour visibility
if the brightness difference and the colour difference between the two
colours are greater than a set range. They suggest a colour contrast
algorithm, which is used in test at:
http://juicystudio.com/services/colourcontrast.php#contrast

The difference in brightness between the two colours  is not sufficient
and the difference in colour between the two colours is not sufficient
too in folowing cases of Ubuntulooks default theme:

1. Title bars with name of launched applications
2. Highlighted progress bars with text or numbers (e.g. during downloading packages)

Because accessibility also benefits people without disabilities,
including older people with changing abilities due to aging (see
http://www.w3.org/WAI/intro/accessibility.php), this two points
mentioned should be adressed as soon as possible. They have big impact
on large fraction of users, their experience with Ubuntu respectively.
-- 
Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits
https://launchpad.net/malone/bugs/37603



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