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RE: Color contrast

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
Message-id: <003901c20c2f$dec1e340$52366880@laptop600>

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 GMT

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