Create a chromatic aberration effect

Chromatic aberration (distortion), also known as 'colour fringing' is a common optical problem. It occurs when a camera lens fails to bring all colour wavelengths to the same focal plane, or when the wavelengths of colour focus in different positions on the plane. 

It is caused by a lens dispersion, with different colours of light travelling at different speed while passing through a lens – in effect, producing a blurred image with coloured fringes (a rainbow edge in areas of contrast).

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