Chromatic Aberration occurs in real life when the camera lens is unable focus all colors to the same point. This results in colored fringing along the edges of the object. With Image styles you get an approximation of the effect.

• Aberration Strength – Determines how strong the effect is.
• Aberration Bias – Controls the color of the distortion.

Warning
Using Chromatic Aberration on a model that exceeds the image size may cause artifacts near the edges.