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Re: [csswg-drafts] [css-color-4] sRGB doesn't really use 80 cd/m^2 white luminance (#3435)

From: Andrew Somers via GitHub <sysbot+gh@w3.org>
Date: Wed, 25 Nov 2020 03:09:53 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-733434472-1606273792-sysbot+gh@w3.org>
Hi Chris @svgeesus and Hi Jacob @jrus 

I realize this is closed, but just wanted to mention that part of [SAPC](https://github.com/Myndex/SAPC-APCA) is a standardized observer environment, intended to supplant the 80 cd/m² white with something relevant. It's a work in progress, but essentially the idea is to set peak white at five times ambient. I.e. if ambient surround is 32 cd/m², then set white at 160 cd/m². This is obviously in keeping with the "ambient surround should be 20% of peak white".

In practice, per various surveys, people set their displays and devices somewhere between 140 cd/m² and 320+ cd/m².... not even considering high end phones that display over 1200 cd/m². The point being, it's not about mapping to an absolute level as much as mapping to a level appropriate for the display environment.

And also, the IEC standard for sRGB is largely irrelevant in regards to white luminance, as users and automatic brightness adjustment fully dismiss that aspect of the standard.

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