Chromatic Aberration is the effect of a defective lens where it fails to focus all colors into a single point. As cameras might show this in real life, in computer graphics this effect needs to be simulated to achieve a photo realistic look.
What happens inside the Lens can be illustrated like this:
In computer graphics, this effect is simulated to achieve an effect as if your graphic is filmed through a real camera.
Without Chromatic Aberration |
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With Chromatic Aberration |
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Chromatic Aberration is built in as a post process effect in the Viz Engine Render Pipeline.
Make sure you are using the Viz Engine Render Pipeline and Post Process Effects are turned on in your Scene Editor.
Switch to Scene settings and turn on Chromatic Aberration in Post Processing.
X and Y define the offset added to single RGB channels. The higher these values are, the more distorted the lens. Typical values are around 1-2, anything else looks unrealistic.