oldtigger Loc: Roanoke Virginia-USA

on page 1 i asked about raw because i think the blue border on one side and white border on the other side are just artifacts of the jpeg conversion and the levels the OP chose.

CA and LateralCA normally have a luminance change associated with them, i don't see that change here.

Tom Brownell Loc: Chassell, Michigan

It's just that there is no light on that side of the bird to pick up, and there is nothing beyond the bird for the camera to focus on so there is a bleed of the non color (black) into the blue background making it a darker blue! that's all.
No biggie, if it bothers you just ps it out with the air brush tool.

nikon_jon Loc: Northeast Arkansas

I believe that is chromatic aberration.

And that would be my guess as to the cause. Could be a lens quality problem. There are software corrections for that.

One of the problems early lens makers had to deal with. The three principle colors (chroma means color) of light do not focus at the same plane. Thus some of the color focused in front of the film and some of it behind the film, and some right on the film. It even plagues b&w photography. The effect there being a soft picture because the focus was sort of hashed up. I think it is usually corrected with lens coatings and it can be an expensive correction which is why it is common in low-level lenses. It also affects electronic sensors the same way it would affect film.

nikon_jon Loc: Northeast Arkansas

Nope. Two r's. But then it isn't a word we use every day so misspelling is a minor detail.

Tom Brownell Loc: Chassell, Michigan

wow! You guys are too technical for me! I never heard of that word!

oldtigger Loc: Roanoke Virginia-USA

note the color shift
this is what chromatic abberation looks like in its purist form.
Not something we see very often with today's lenses.

(Download)