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

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Wed, 12 Dec 2018 17:21:11 +0000
To: public-css-archive@w3.org
Message-ID: <issues.opened-390328079-1544635265-sysbot+gh@w3.org>
svgeesus has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-color-4] sRGB doesn't really use 80 cd/m^2 white luminance ==
The [definition of sRGB](https://drafts.csswg.org/css-color-4/#biblio-srgb), which is also given in [css-color-4](https://drafts.csswg.org/css-color-4/#predefined) says that the white luminance level is 80 cd/m^2. 

In practice the level is typically higher, often significantly higher, like the 160 cd/m^2 used by Adobe RGB (1998). 

This impacts the black level, which is raised due to flare, when black point compensation is in use.

This also affects compositing SDR content (such as most web pages) onto HDR content (video, images), which is often done for information overlays and mixed HDR/SDR content in general. The result looks very dull if 80 cd/m^2 is used.

Is there a more modern, reference-able recommendation to use a higher white level for sRGB?

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3435 using your GitHub account
Received on Wednesday, 12 December 2018 17:21:17 UTC

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