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Re: sufficient color contrast

for

From: John Britsios
Date: Aug 19, 2003 7:12PM

If I got your message right, what is if you use the real web safe colors,
which are only 22, see
http://hotwired.lycos.com/webmonkey/00/37/index2a_page5.html ?

John

----- Original Message -----
From: "Marek Prokop" < <EMAIL REMOVED> >
To: < <EMAIL REMOVED> >
Sent: Tuesday, August 19, 2003 8:02 PM
Subject: sufficient color contrast


> Hi All,
>
> The Techniques For Accessibility Evaluation And Repair Tools,
> particularly the Technique 2.2.1
>
> http://www.w3.org/TR/AERT#color-contrast
>
> states that the brightness difference between background and
> foreground color should be at least 125 (according to the
> formula given in that checkpoint) to ensure sufficient color
> contrast. Is this really sufficient difference? 125 is only 49%
> of 255 (what is the most possible brightness difference) and I
> read somewhere (unfortunately don't remember where) that at
> least 80% brightness difference is necessary.
>
> In fact, on my old monitor, even the difference of 154 is not
> enough. 80% would equal 204, what seems to be OK.
>
> Regards,
>
> Marek Prokop
>
>
>
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