- From: Chris Lilley via GitHub <sysbot+gh@w3.org>
- Date: Sun, 09 Feb 2020 03:31:19 +0000
- To: public-css-archive@w3.org
> Okay fair enough. Is there any HDR video getting used in practice on the web? In-TV browsers and apps are using it, and getting that content onto the open web is an area of active current development. HDR video players which use TTML captions are also doing SDR onto HDR compositing. > Does black point compensation get used ever on the web? It doesn't (except in WCAG contrast calculations, which assumes a fixed 5% viewing flare), and probably should, especially once color-managed CMYK and other ink profiles get used in Web-to-PDF content. > Anyhow, you probably want to assume the same brightness and context for both the HDR and SDR content. That would a) be physically impossible, the screen can't display that luminance level on the whole screen, and b) highly undesirable, because of burning out your eyes. > If your HDR content has some extreme specular highlights that is kind of the point of HDR > you could figure out what brightness is used for a diffuse reflector (e.g. a piece of white paper in the HDR video) and use that as the brightness for your SDR content what you are describing is called the paper white or, more generally, the media white. And knowing that level is precisely why I opened this issue. > Do you have a link? I primarily meant that they had pointed this out in in-person discussions. But see for example https://downloads.bbc.co.uk/rd/pubs/papers/HDR/BBC_HDRTV_FAQ.pdf and https://www.w3.org/2017/11/07-colorweb-minutes.html#meanings also (in progress) https://w3c.github.io/ColorWeb-CG/#goals -- GitHub Notification of comment by svgeesus Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3435#issuecomment-583800942 using your GitHub account
Received on Sunday, 9 February 2020 03:31:21 UTC