Chromatic aberration, also known as color fringing, is a color distortion that creates an outline of unwanted color along the edges of objects in a photograph. Often, it appears along metallic surfaces or where there's a high contrast between light and dark objects, such as a black wall in front of a bright blue sky.

How do you identify chromatic aberration?

Chromatic aberration is often more noticeable toward the edges of the frame, not the center. (This is generally due to the curvature of the lens elements.) Therefore, if you reframe your shot but put your main subject closer to the middle, you'll often end up with little-to-no chromatic aberration on your subject.

Why is chromatic aberration?

Chromatic aberration is an effect that occurs when a lens is not able to properly refract all the wavelengths of colour in the same point. ... In reality though, different colours of light hit the lens at different speeds (and so, at different times), causing different types of chromatic aberrations to occur.