Hallo, I'm the newbie. At first sorry for my bad english.

The tool "DigitalPhotoShifter" is available in three version:

Home:
[Entzerren]
Correct converging verticals by a symple lgorithm. The proporties of picturedetails will be hold.
This mean: details in the upper line of a building will be stretched less then details of lower lines.
These results in "harmonic" views of corrected photos.

Pro:
[Shiften]
Correct converging verticals exactly like a speciel shiftobjective.
The proporties of details will appear exactly as in original.

ProPlus:
[Doppelshiften]
Works like the pro- version, but can also corect converging lines in horizontal direction. This is like a special architektural camera.

Importand vor digital shifting is the exakt focal length! By using the correct value therefor the results will corospond exakly to the original.

By using the shif- functions it's possible to activate "Harmonic Hight". This mean, the hight of lines will be smaller for upper details in picture.
This effect is like the apearience by lookong up a building. Upper windows appear lower as windows in hight of the horizont.

By all version is important, that only one Interpolation needed for correcting perspective ,lensdistortion and rotating.

This tool is also available as a photoshop- plugin. Therefor only needs a mail for a demo version.

On my homepage is a html- show with details of function of the tool.
Sorry, but this is only in german.

Best regards
frank