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Re: [csswg-drafts] [cssom-1][mediaqueries-5][css-color] Dealing with bi-plane (video/graphics) when reporting values (#4471)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Thu, 31 Oct 2019 01:08:52 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-548175083-1572484131-sysbot+gh@w3.org>
Agreeing with others that color gamut (how saturated a color can be displayed) and dynamic range (how many photographic stops of luminance can be displayed {all at once | at various times}) are distinct concepts although they are slightly correlated (HDR tends to require WCG as well, also higher bit depth per component).

> Since current HDR formats use the Rec. 2020 color space and PQ transfer function, the Media WG opted for a single Boolean to assuage fingerprinting concerns whilst still satisfying content providers' needs.

That single Boolean will struggle with content that uses Rec.2020 colorspace and the HLG transfer function, though. "Everything uses PQ" is a Film/Movie-centric view; it is true there but not so much for News or Live Sports, for example.

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Received on Thursday, 31 October 2019 01:08:53 UTC

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