I'm fairly new to Blender, but I hope there's a simple solution to this issue.
In Cycles I'm trying to make a composite of (soon-to-be) animated objects and video footage.
I've used nodes to apply transparent and translucent shaders to the four circle meshes (UV unwrapped with textures) and put in a simple cube for comparison's sake. (An emission shader has also been applied to the largest, yellow circle.)
This is the 3D view set to solid shading, with a background image.

Here's the rendered view:

Why is everything so "ghostly" and pale? No shader has been applied to the cube, and the circles appear much dimmer than I need.
Is there a way to fix this? How can I make the circles appear more "solid" without losing the transparency and translucency I need? It would be ideal if it could look more like the preview in the viewport shading,

but I hear the viewport shading result and the final render result are never the same...
Any thoughts?
cycles material

compositor nodes


Gandlaf3: I'll look into your link.
Cegaton, please see my edited entry for the screencaps of my nodes.
– KTS Aug 31 '14 at 17:50