Originally posted by Macca35 I'm looking to start doing PP properly, rather than just using the software which came with my GX-10. Would anyone be able to suggest a package that will allow me to edit out the CA problems I seem to have with certain telezoom lenses?
My budget doen't stretch to the full blown Photoshop CS system.
There are three reasonable fixes for chromatic aberration artifacts:
(1)
selectively desaturate (turn purple stuff gray)
works for purple fringing only
(2)
edge-detect-desaturate
works best for purple fringing, is potentially less disruptive than (1), and can also reduce lateral CA artifacts (red/cyan or blue/yellow fringing)
(3)
magnify (stretch) the red and blue channels to align properly with the green channel
works works for lateral CA only
For zero dollars
you can get the GIMP to do (1)
GIMP - The GNU Image Manipulation Program
and add Darla's purple fringe remover script to do (2)
Purple Fringe Fix | GIMP Plugin Registry
If you need to do (3) it's best to do it at the RAW converter stage; dcraw (also free) can do this but you have to manually specify parameters so it's way harder than ACR or Lightroom (or pentax photo lab, for that matter).