A while ago I wrote about using FwTools to create or manipulate GeoTIFF images for use with the resample tool. One common problem I did not mention right then is that the tags containing this geo information are not understood by every tool. If you for example open the image in a painting program, like PhotoShop or Paint Shop Pro, to make some changes to it, the image will be saved back to disk as a normal TIFF file. I have now extended the tutorial on the Wiki with a small section about how to save this geo information and later put it back. That allows you to easily restore it after editing the image in your favorite tool.