Adding blending to the canvas API

All,

I'm working on a spec to add blending and compositing through simple CSS
keywords. A very early draft can be found here:
https://dvcs.w3.org/hg/FXTF/raw-file/tip/compositing/index.html as well as
a blog post here:
http://blogs.adobe.com/webplatform/2012/04/04/bringing-blending-to-the-web/
It seems that this feature would be useful for Canvas as well. Group
isolation and knockout might be hard to implement but they aren't as
important as the blending modes themselves.

Does anyone think this is value in extending the canvas API so you can set
multiply, overlay, etc?

Rik
Adobe Systems, Inc