Hi I have problems with tif files

Image.open('filename') and im.info gives the following

(640, 480)
{'resolution': (1, 1), 'compression': 'raw'}
F;32BF
TIFF


But when I run the im.show() it gives the following error.
>>> im.show()
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    im.show()
  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 1483, in
show
    _show(self, title=title, command=command)
  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 2123, in
_show
    apply(_showxv, (image,), options)
  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 2127, in
_showxv
    apply(ImageShow.show, (image, title), options)
  File "/usr/lib/python2.6/dist-packages/PIL/ImageShow.py", line 41, in
show
    if viewer.show(image, title=title, **options):
  File "/usr/lib/python2.6/dist-packages/PIL/ImageShow.py", line 62, in
show
    base = Image.getmodebase(image.mode)
  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 245, in
getmodebase
    return ImageMode.getmode(mode).basemode
  File "/usr/lib/python2.6/dist-packages/PIL/ImageMode.py", line 50, in
getmode
    return _modes[mode]
KeyError: 'F;32BF'

I have no idea why this happens.
I will appreciate your response. The file opens with ImageJ and
ImageMagick. It is a 8-bit RGB file.
I have looked up Google and came across few similar queries but do not
find any resolution other than suggestions to link xv to ImageMagick.
Because the solutions are old i.e., dated in 2007, I am not sure if this
is a fix. Please help.
Thanks,
Rajan