Attached is a simple but handy little node: blend_color.
Blend_color returns the solid color formed when a translucent foreground color is placed over a solid background color.
The demo shows a Venn diagram with a translucent yellow circle placed over part of a solid blue circle (against a white background). The intersection is green, but if you wanted to provide a legend you would have no way of determining the precise color of that intersection without this node.
Enjoy!
John
