Hi Malcolm,
A better idea, probably, is to extract the R, G and B channels from all images, then stack these separately. Once you have these aligned and stacked, combine the 3 images in something like the GIMP or Photoshop. The GIMP lets you do Chromatic Aberration correction with a free plugin - not sure about PhotoShop.
Depending on the type of chromatic aberration (this won't work for lateral CA) you can achieve the same thing by loading R, G and B in 3 separate layers, set them to 'lighten' and just move around red and blue until you're happy (move red into the opposite direction of blue).
Hope this helps!
Ivo
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