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Color contrast

From: Loretta Guarino Reid <lguarino@adobe.com>
Date: Thu, 30 May 2002 17:27:07 -0700
Message-Id: <200205310027.RAA11742@patagonia>
To: w3c-wai-gl@w3.org

I checked with Lars Borg, one of Adobe's color scientists, about the best way 
to evaluate the contrast between two RGB colors. Here is his advice:

Convert each color to Lab, then calculate the length of the difference 
vector in Lab (also known as deltaE). The distance is a fairly 
consistent measure of color difference. Contrasting colors may need a 
deltaE of 40 or more. (This needs to be verified.)
Received on Thursday, 30 May 2002 20:28:19 GMT

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