Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

[css-color] Specification for DCI P3 #294

Closed
svgeesus opened this issue Jul 10, 2016 · 5 comments

Comments

Projects
None yet
3 participants
@svgeesus
Copy link
Contributor

commented Jul 10, 2016

https://drafts.csswg.org/css-color/#predefined

The defining spec for dci-p3 is not freely available. It costs USD 240. There is a Wikipedia article, which is non-authoritative and of unknown accuracy (particularly for the transfer function and viewing conditions).

wikipedia: https://en.wikipedia.org/wiki/DCI-P3

@svgeesus svgeesus self-assigned this Jul 10, 2016

@svgeesus

This comment has been minimized.

Copy link
Contributor Author

commented Aug 4, 2016

Unverified, but another reason to check the actual specification:

P3 has a different white point than ITU 709 does. ITU 709 monitors are calibrated for a white point of D65, whereas P3 uses a white point of D61.
http://www.dvinfo.net/article/optical-science/is-p3-the-new-4k.html

@svgeesus

This comment has been minimized.

Copy link
Contributor Author

commented Sep 19, 2016

Confirmed at TPAC Lisbon by Pierre-Anthony Lemieux - what the spec calls DCI P3 is not actually defined in any spec, the transfer function is wrong and it is not used to ship video content to consumers.
What we have is similar to Apple 'display P3' which uses the P3 primaries, a D65 whitepoint (unlike P3) and a 2.2 gamma (unlike P3).

@tantek

This comment has been minimized.

Copy link
Contributor

commented Jan 9, 2017

"wide color" / "Display P3" appears to be gaining some awareness / traction / support, e.g. https://engineering.instagram.com/bringing-wide-color-to-instagram-5a5481802d7d so we really need to get ahead of this or else we'll just end up specing whatever it is that Apple has decided to implement.

@tantek tantek added the Agenda+ F2F label Jan 9, 2017

@astearns astearns removed the Agenda+ F2F label Jan 11, 2017

@svgeesus

This comment has been minimized.

Copy link
Contributor Author

commented Jan 13, 2017

Related to #295

@svgeesus

This comment has been minimized.

Copy link
Contributor Author

commented Dec 10, 2018

Closing as moot; CSS Color 4 uses image-p3 which uses the same primary chromaticities as DCI P3, but differs in transfer function, whitepoint, and viewing conditions.

@svgeesus svgeesus closed this Dec 10, 2018

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.