- From: Gregg Vanderheiden <GV@TRACE.WISC.EDU>
- Date: Tue, 04 Jun 2002 20:25:24 -0500
- To: "'Loretta Guarino Reid'" <lguarino@adobe.com>, w3c-wai-gl@w3.org
Interesting. But how does that control for color blindness? The problem is contrast, not color difference. Are they the same? Thanks Gregg ------------------------------------ Gregg Vanderheiden Ph.D. Ind Engr - Biomed - Trace, Univ of Wis gv@trace.wisc.edu > -----Original Message----- > From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf > Of Loretta Guarino Reid > Sent: Thursday, May 30, 2002 7:27 PM > To: w3c-wai-gl@w3.org > Subject: Color contrast > > > 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 Tuesday, 4 June 2002 21:26:00 UTC