Removing Chromatic Aberrations - by Yusuf
If your camera can shoot in RAW, you should shoot in RAW because Adobe’s RAW processing engine has dozens of powerful tools for fine tuning your digital images. I’ll try and show you how to remove Chromatic Aberrations using Adobe Camera RAW processor.
But first, what are Chromatic Aberrations?
CA or Chromatic Aberration is a purplish, bluish or greenish fringeing around the edges of Digital pictures caused by poor lens design, or good lenses used under certain lighting conditions. Teleconverters or Extenders are notorious for inducing CA. So are low cost P&S Digital Cameras. You can see this purplish fringeing at the edge of Pharaoh Ramses’s face in the illustration below, which is a crop from a NEF (Nikon RAW) file. In the diagram, I have tried to illustrate how Chromatic Aberrations are caused by poor quality, or poorly designed lens systems. The good lenses are expensive because they incorporate several lens elements and exotic coatings to reduce or remove Chromatic Aberrations ….. Full Article.