Am 04.05.2012 19:03, schrieb Mark D. Fink:
> I'm not seeing huge differences between the two
I'm not surprised. I guess they do linear scaling of the channels, just
like the manual version, too. I did no direct comparison, but the
automatic correction of my Zenitar was ok - about the same what I could
achieve with any linear correction, be it ACR or any other raw converter.
The Zenitar is especially complicated, since it shows red-cyan fringing
in the very corners and blue-yellow fringing further to the middle. This
kind of CA is fully correctable only with non-linear techniques like
f.e. panotools plugins or tca_correct offer (basically a lens distortion
correction for the red and blue channel only) - unfortunately not for raw.
BTW.: RawTherapee has a non-linear automatic CA correction since more
than a year, which corrects the Zenitar very well. Details can be found
further down on http://rawtherapee.com/forum/viewtopic.php?f=1&t=2572
Unfortunately it fails sometimes.
Since ACR uses linear correction it is probably more robust and
(hopefully) won't fail that easy...
--
Erik Krause
http://www.erik-krause.de
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