See http://cs.sru.edu/~ddailey/svg/V1.svg 

 

This represents two Venn diagrams illustrating the additive and subtractive
color models. (using 3 circles rather than the seven paths used at
http://en.wikipedia.org/wiki/File:SubtractiveColor.svg )

 

Because of the way feImage is used with feBlend, only Opera seems to display
these in a way consistent with my expectations.

 

The filtering I've used ended up being a bit more complex than I would have
hoped, so I have a question (Q) and a statement (S):

 

--------------

Q. Can anyone think of a simpler way to do this than they way I've done it?
It works and I think this is how it should be, though I have a pair of
filters defined for each Venn diagram while it seems like one should
suffice.( I consider the solution at Wikipedia to be simply wrong for any of
a zillion reasons that I realize do not appeal to some people, but most of
those reasons have to do with "accessibility" broadly defined.)

 

---------------

S. My experiments with feComposite to try to accomplish the same thing were
remarkably unsuccessful, with the exception being the additive color model
shown here:

http://cs.sru.edu/~ddailey/svg/V2.svg

 

The inconsistency of Opera, ASV, and the spec (as noted somewhat at
http://lists.w3.org/Archives/Public/www-svg/2011Nov/0096.html )

 

I will hope to make some of those experiments visible to the SVG WG sometime
soon.

 

Cheers

David



[Non-text portions of this message have been removed]



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