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Re: How were the WCAG contrast ratios determined

for

From: Maxability Accessibility for all
Date: Feb 11, 2016 7:38PM

Hello Sean,

The below link is what I am refering for years when someone ask me the same
question.
http://juicystudio.com/article/luminositycontrastratioalgorithm.php
It may help you.

Thanks & Regards
Rakesh

On Fri, Feb 12, 2016 at 8:00 AM, Sean Curtis < <EMAIL REMOVED> > wrote:

> Does anyone have any historical information about how the ratios for A, AA,
> and AAA were determined? Were they based on the contrast of screens, or on
> how light and vision works? I couldn't find any information about how these
> were initially determined. Can anyone fill me in?
>
> Cheers,
>
> Sean
> > > > >