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A subtle amount of chromatic aberration aka "RGB separation" is 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. Looks great on both motion graphics and CG composites. 

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Changelog:
10/01/2018 - Initial release v1.0
22/11/2018 - Major update v2.0 
  • Moved to GPU
  • Added support for 16 & 32bpc
  • Repeat edge pixels
  • Known issue: rotation incorrect if source isn’t 1:1

Check out Chromatic Time Offset for a plugin that can shift RGB channels in time! Compatible with AE versions CS6 and up, Windows & Mac.