- From: Erik Dahlstrom <ed@opera.com>
- Date: Mon, 12 Sep 2011 13:52:55 +0200
- To: "Dean Jackson" <dino@apple.com>, "Chris Lilley" <chris@w3.org>
- Cc: public-fx@w3.org, www-svg <www-svg@w3.org>
Hi Dean, On Mon, 05 Sep 2011 22:41:09 +0200, Chris Lilley <chris@w3.org> wrote: > On Friday, September 2, 2011, 3:10:53 AM, Dean wrote: ... > DJ> It turns out there are a > DJ> few different specifications for this. The closest to what is > DJ> specified is in Rec. ITU-R BT.709-5 [1], but it is slightly > different: > > DJ> 0.2126 red, 0.7152 green, 0.0722 blue I see that the filter draft was updated[1] recently to use the higher precision values, 0.2127 red, 0.7152 green, 0.0722 blue. That however sums to 1.0001, and we'd be better off using the above values instead (for the red channel). But looking ahead a bit I think it would be even better if we used the below figures instead. > Those are the correct values (to 4 figures). For higher precision, the > values are 0.212656 0.715158 0.072186 I've not yet made any attempts to fix this, but I have created an action to do so[2]. [1] http://dvcs.w3.org/hg/FXTF/rev/b31bb9367aef [2] http://www.w3.org/Graphics/fx/track/actions/53 -- Erik Dahlstrom, Core Technology Developer, Opera Software Co-Chair, W3C SVG Working Group Personal blog: http://my.opera.com/macdev_ed
Received on Monday, 12 September 2011 11:53:32 UTC