(Above photograph taken from Klaas Bloem's barrel distortion correction demonstration. To see the above photo, click the above image. Wait for the web-page to load. After you have appreciated Klaas's album, you can then click the `back' button on your web-browser, and the above image will be displayed correctly.)
Klaas Bloem (Yahoo!, FZ10 group, 8 May 2004) writes...
The FZ10 has no noticeable pin cushion distortion at full telephoto {e.g. 12x} but barrel distortion at full wide angle {e.g. 1x} can be a problem.
Open this web page: Barrel Distortion Correction tutorial by Vincent Bockaert. Read the text on this page, download and install the Panorama Tools {see Section} as described. For the correction of barrel distortion at 6mm (full wide angle) use a value of -0.016 for `b', 1.016 for `d'.
(Picture above taken by Klaas Bloem and barrel distortion corrected.)
Cedric Trojani's example of distortion, corrected with Photofiltre.
PTLens -- free interface to Panorama Tools. Includes profiles for FZ10/20. clens is a Linux version (command-line only).