W3C home > Mailing lists > Public > public-css-archive@w3.org > July 2020

Re: [csswg-drafts] [css-color-hdr-1] Query 9: Black Level (#5322)

From: Chris Lilley via GitHub <sysbot+gh@w3.org>
Date: Sun, 19 Jul 2020 03:21:53 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-660579292-1595128912-sysbot+gh@w3.org>
@simontWork I agree that for HLG in CSS, the screen peak brightness and the ambient illumination level are not needed for correct display; and the user can freely adjust the peak brightness to suit the ambient illumination.

As I am sure you know, this is not the case for PQ; a re-rendering step is needed for viewing in non-reference conditions.

For black level though, and in particular when combining SDR and HLG HDR content, it seems that the black level of sRGB (or indeed of 709) should not be zero because the very deepest blacks in HDR are blacker than sRGB black in the reference viewing conditions. 

GitHub Notification of comment by svgeesus
Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5322#issuecomment-660579292 using your GitHub account
Received on Sunday, 19 July 2020 03:21:55 UTC

This archive was generated by hypermail 2.4.0 : Tuesday, 5 July 2022 06:42:11 UTC