from wikipedia:
chromatic aberration occurs when a lens has a slightly different refractive index for different wavelengths of light - resulting in some fringing of some colours.
...just like 'The Dark Side of the Moon' - :D
this could be and is often used to enhance realism in cg images.
how ?
here's my hack
we could render split the RGB and adjust the hue and offset or distort the channel a little then mix it back in the comp.
& here' s my attempt at a copnet - made long after this post : 22 Jan 2010 !
and here's a beautiful example from Andrew Schneider:
schneiderFX/Macro
UPDATE...
I've applied it a little here for my bubble render...hopefully it helps sell it a bit !
UPDATE #2
I stumbled across a link to a great tutorial for achieving the effect in After FX
by on Jul 19, 2013
a couple of points I got from it:
the colors used in the effect in this tut were pure Cyan and Magenta
The other thing was that the effect was used more toward the boundary of the image - the effect was masked off in the center of the image with a soft-falloff / a large amount of feathering.
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