Color contrast

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

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 UTC