Archived posting to the Leica Users Group, 1999/06/26

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Subject: [Leica] Re: wide-angle lenses
From: Andrew Nemeth <azn@nemeng.com>
Date: Sun, 27 Jun 99 13:48:24 +1000

"DT" InfinityDT@aol.com wrote:

>you could tilt the enlarging easel to correct the convergence.  
>Not much help shooting chromes, though.  I wonder if Photoshop 
>5.0 has such a feature (it must).

Indeed it does - as mentioned by others it is called the 
'perspective' function and it becomes available when you want 
to apply a transform to a selection.

This is okay if you only want to quickly correct by eye, but if
you want to get precise about the exact amount of correction (rotation, 
tilt, yaw), then you can even get a free 3rd party plugin which 
allows you to dial in exact degree values for the angle corrections.

Panorama_Tools by Helmut Dersch 
<http://www.fh-furtwangen.de/~dersch/>  

Choose the 'perspective' option in the filters menu after 
installation.  The interface is a bit byzantine (it is written
by a German Physics Professor after all!), but once you wrap
your brain around it, it works remarkably well.

Amazing stuff - reproduceable lens board movements built into 
software, *after* the fact!

Regds,

Andrew Nemeth
www.nemeng.com