- From: Chris Lilley via GitHub <noreply@w3.org>
- Date: Tue, 19 Aug 2025 13:34:05 +0000
- To: public-css-archive@w3.org
The CSS Working Group just [discussed](https://www.w3.org/2025/08/19-css-color-minutes.html#e11d) `Define rec2020 color space to use 2.4 gamma` and agreed to the following: * `RESOLUTION: make the change to 2.4 gamma for rec2020 unless it's not web compat` <details><summary>The full IRC log of that discussion</summary> ccameron: historically lot of confusion of rec709 and 2020 should use as gamma<br> ccameron: lot more effort in the video world to say rec709 and 2020 when they are displayed referred use display gamma<br> ccameron: display referred tell you how you go from pixel value to output light<br> <TabAtkins> ccameron: in contrast with scene referred<br> ccameron: proposal is to get 2020 definition to 2.4 gamma<br> ccameron: apple has changed already to use 2.4 gamma AFAIK<br> ccameron: we could solve this long historic confusion by switching to 2.4<br> ccameron: we could also do it for 709<br> ChrisL: yes should be a separate discussion<br> ChrisL: BBC agrees its the right thing<br> ChrisL: concern is that it was added in 2016 and its very visible change<br> ChrisL: it changes color<br> ChrisL: trying to look on WebArchive for data about compat but we dont have this data<br> ChrisL: so people will need to update if there is any usage and also for WPT<br> florian: can we resolve in a way that its only if web compatible<br> lea: i would be surprised if its not web compat<br> lea: new color formats takes a very long time to be adopted by authors, e.g. even HSL which has existed for decades has surprisingly low numbers<br> ChrisL: lets do this<br> proposal: make the change to 2.4 gamma for rec2020 unless it's not web compat<br> ChrisL: it doesnt change rec 2100<br> `RESOLUTION: make the change to 2.4 gamma for rec2020 unless it's not web compat`<br> </details> -- GitHub Notification of comment by svgeesus Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/12574#issuecomment-3200792172 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Tuesday, 19 August 2025 13:34:05 UTC