Brian Suda 01 January 2011 Mike Kaply, there are a few equations for contrast with luminance, this is the W3C definition, which is very similar http://www.w3.org/TR/2006/WD-WCAG20-20060427/appendixA.html#luminosity-contrastdef They also have a more complex equation which I wanted to avoid in this quick article. http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-TECHS/G145.html Testing the contrast by luminance is yet another tool to have in your tool box. I don’t think it really matters which equation you choose, there will always be issues with edge-cases, it is more important that you are using something.
Brian Suda
Mike Kaply, there are a few equations for contrast with luminance, this is the W3C definition, which is very similar
http://www.w3.org/TR/2006/WD-WCAG20-20060427/appendixA.html#luminosity-contrastdef
They also have a more complex equation which I wanted to avoid in this quick article.
http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-TECHS/G145.html
Testing the contrast by luminance is yet another tool to have in your tool box. I don’t think it really matters which equation you choose, there will always be issues with edge-cases, it is more important that you are using something.