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[Peter Suetterlin]

> hurrican ;-) ). Most of the times I use colour/brightness correction
> it's just to improve little disharmonies at overlaps - maybe very
> small vignetting effects from the lens?!

Definitely, depending on the Lens.
For my old Powershot A50 I ended up doing a 'flatfield', i.e., taking
many images of clear sky (or white paper?  don't really remember).
Then you can see the intensity gradient over the field.  I wrote a
small C program that corrected this gradient, and it largely improved
the stitching results.

   Pit