[Tutor] libtiff--can't find library

[R Bruce van Dover]

Presumably this is a newbie question; apologies in advance, but I have 
spent hours trying to RTFM, to no avail. Can anyone help?

I've installed pylibtiff-0.1-svn.win32.exe since I want to be able to 
read a TIFF file. But when I type (in IDLE) I get

>>>from  libtiffimport  TIFFfile,  TIFFimage
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in<module>
       from libtiff import TIFFfile, TIFFimage
   File "E:\Python27\lib\site-packages\libtiff\__init__.py", line 4, in<module>
      from .libtiff import libtiff, TIFF
   File "E:\Python27\lib\site-packages\libtiff\libtiff.py", line 35, in<module>
     raise ImportError('Failed to find TIFF library. Make sure that libtiff is installed and its location is listed in PATH|LD_LIBRARY_PATH|..')
ImportError: Failed to find TIFF library. Make sure that libtiff is installed and its location is listed in PATH|LD_LIBRARY_PATH|..
>>>  import sys
>>>  print sys.path
['E:\\Python27\\Lib\\idlelib', 'E:\\Windows\\system32\\python27.zip', 'E:\\Python27\\DLLs', 'E:\\Python27\\lib', 'E:\\Python27\\lib\\plat-win', 'E:\\Python27\\lib\\lib-tk', 'E:\\Python27', 'E:\\Python27\\lib\\site-packages']

Libtiff is in the 'E:\\Python27\\lib\\site-packages' directory as it's 
supposed to. So is, e.g., Numpy, which imports just fine.

What am I doing wrong? FWIW, I tried the PIL package, and had the same 
problem (module not found). Why do these modules not import when Numpy, 
matplotlib, scipy, etc. import as expected?

Running Win7, 32bit, Python 2.7.1.
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