Making Your Web Colors Visible For All – Five Color Accessibility Tools

If you are designing, or re-designing your web site, it is time well spent running your website through the color accessibility tools below to ensure that your site can be seen correctly by as many people as possible. Most of these tools use WC3 guidelines to perform their various operations. If you can actually read and understand them, the Web Content Accessibility Guidelines (WCAG) 2.0 requires, amongst other things, that there is sufficient contrast between text and background color. For a person with a color disability, the colors used on a web site can mean the difference between being able to read text and images or not. 1 in 12 people have some sort of color deficiency.

http://www.sitepoint.com/blogs/2009/08/20/color-accessibility-tools/