21 Mar
2007
21 Mar
'07
7:44 p.m.
On Wed, 2007-03-21 at 09:39 -0700, Esben Jannik Bjerrum wrote:
Is it possible to use additive mixing of transparent objects. Imnot sure if I use the correct terminology, but I mean like mixing colored light and not colored paint, so that a green transparent object overlaying a red one will be yellow and not brownish? Or do this exceed the SVG format? The mixing seem to be somewhere in between the two possibilites?
The normal SVG blending mode is essentially a weighted average based on the alpha of the object. So, with 50% transparency, rgb(0%, 100%, 0%) over rgb(100%, 0%, 0%) comes out to rgb(50%, 50%, 0%).
It's possible that the <feComposite> filter primitive could be made to do what you want, although Inkscape doesn't support it yet.
-mental