PTShift

PTShift is a photoshop CS Javascript. It was developed by Eric Gerds

It's main idea is to correct transverse chromatic aberration (tCA) visually at different distances from the image center (where there is no tCA) and pass the single correction values as virtual control points to PTOptimizer in order to calculate correction parameters for the panotools radial shift filter.

The idea was brought up by Jim Watters Some more information is found there or on Erik Krause's page