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Re: Color frequency and wavelengths

From: David Woolley <forums@david-woolley.me.uk>
Date: Thu, 25 Jun 2015 23:04:44 +0100
Message-ID: <558C7AFC.4070007@david-woolley.me.uk>
To: w3c-wai-ig@w3.org
On 25/06/15 14:24, SALES, TERRY LYNN wrote:
> Anxious to hear responses to this one!  We have a screen that is
> intended to grab attention so it is the brightest orange I’ve ever seen
> with bolded black text. Yes, it passes contrast, but yes, it is an
> assault to the eyes!
>

Are you referring to spectral orange or sRGB red plus green?

Before colour displays became common something approaching spectral 
orange on black was preferred because it was supposedly easy on the eye. 
  However the red in sRGB displays has to so close to infra-red, to 
avoid cross talk with the eye's mid-frequency cones, that it will suffer 
from significant chromatic aberration.  (The peak responses of the mid 
and low frequency cones are both in the yellow-orange range, but 
displays, and printing, need to us colours towards the edge of their 
ranges to avoid cross talk.)

Red on blue is particularly bad on sRGB displays, as it maximises 
chromatic aberration.
Received on Thursday, 25 June 2015 22:05:26 UTC

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