On this thread I saw that GIMP is not displaying this tiff image right. Is there another program I can use to open it?
You need to report this issue to the gimp developers and provide sample files for them to work with, you will find their bug tracker here:
Then attempt to use imagemagick to transform the tiff into a png, if that works then you know that libtiff is probably ok. If it doesn't work in imagemagick then try some other tools, like the eye-of-gnome.
Make sure that once you've tested all these and found them in error, you should report the bug to the libtiff developers: