Plugin Everything has a free plugin for After Effects that you’re going to dig, man! It’s a great way to increase the realism of pixel perfect computer graphics.
Quick Chromatic Aberration is a free plugin to add that effect with minimal effort. This plug-in is useful for both live motion video footage and CG rendered content. It’s available for both Mac and Windows.
Looking for something a little more robust?
Here are a few other plug-ins that offer RGB separation, work with AE, and are available in a variety of price ranges:
Move/Scale/Rotate/Fade R,G,B channels
This plugin allows you to move, rotate, scale, blur, blend, fade and distort the RGB channels independently. You can use this plugin to create the popular “Chromatic Aberration” effect.
Featuring Integrated Mocha Tracking and Masking
Create powerful lens distortion effects, in-camera shake effects, chromatic aberrations, and a whole host of warping tools with the Sapphire Distort Unit.
Developed for generating and animating organic-looking lens flares in Adobe After Effects with unbelievable ease and speed!
Optical Flares has an intuitive, elegant interface that makes designing a beautiful, realistic, and complex lens flares a joy. Open GL acceleration allows artists to quickly and easily generate flares and add finishing touches to motion graphics and live action footage. Features Chromatic Aberrations!