[filmscanners] RE: distortion correction

["Paul D. DeRocco" <pderocco@ix.netcom.com>]

> From: filmscanners_owner@halftone.co.uk
>
> Is there any programme which can correct barrel distortion etc from wide
> angle digital images? preferably for the Mac but maybe capable of running
> in Virtual PC.

I don't know if it's available for the Mac, but the freeware PS plug-in set
called Pano Tools can do this. It's programmed with numbers, rather than
visually, but doing simple barrel or pincushion distortion correction is
pretty easy. Go into the Correct filter, check Radial Shift, go into its
options, and try various small numbers (around 0.01 for pincushion, -0.01
for barrel) in the third column, with 0's in the first two columns, and 1's
in the fourth column. The other columns allow for doing more complex
correction, including chromatic aberration if you tweak the red and blue
values in the fourth column.

Someone also wrote a GUI front-end for Pano Tools, called PTGui, but I've
not used it.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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