Support Contrast Analyser development Support has been provided in part by the National Institute on Disability and Rehabilitation Research via the Trace Center under grant # H133E030012 What is the Contrast Analyser? It is primarily a tool for checking foreground & background colour combinations to determine if they provide good colour visibility. It also contains functionality to create simulations of certain visual conditions such as colour blindness. Determining "colour visibility" is based on the Contrast Ratio algorithm, suggested by the World Wide Web Consortium (W3C):
Normal This box shows the colors with normal vision. Use: Choose a foreground color by pointing the mouse over the wheel or the vertical grey gradation strip and click or, if you have a touch screen, just touch them. Then click the "Background" button and choose a background color the same way. If a checkmark becomes visible the color pair is good for accessibility.
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Date created: January 11, 2005 Date last modified: March 30, 2009 The Colour Contrast Check Tool allows to specify a foreground and a background colour and determine if they provide enough of a contrast "when viewed by someone having color deficits or when viewed on a black and white screen"[ W3C ]. The tool will indicate that the colours pass the test if both the colour difference and the brightness difference exceed their threshold.
Accessibility Tools Updated Accessible Table Builder - Create an accessible table using scope , header and id attributes using a wizard to guide you through the process. Updated Quick Form Builder . A complete re-write/re-think of the old Accessible Form Builder tool.