So my question, how accurate is for  Juicestudios Color Contrast Analyser
> and Color Checker Firefox extension? Will the brightness of monitor affect
> the result.
>


Those tools should be accurate for text-only combinations that don't use
transparency*, but I don't think they can detect the contents of images.
Regardless, if you need something that works absolutely on the final
rendered result, try
http://www.paciellogroup.com/resources/contrast-analyser.html which gives
you an on-screen selector.

cheers,

Ben


* if you're using alpha transparency i've expanded on that point at
http://weblog.200ok.com.au/2009/09/accessibility-vs-alpha-transparency.html

-- 
--- <http://weblog.200ok.com.au/>
--- The future has arrived; it's just not
--- evenly distributed. - William Gibson


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