OSError: [WinError 193] %1 is not a valid Win32 application (LibTiff)

Question

I need to use libtiff for a project.

• OS : Windows 10
• Python Version : 3.6.6;
• Libtiff installed using : pip install libtiff
• Tiff installed from https://sourceforge.net/projects/gnuwin32/
• Environment path added: C:\Program Files\GnuWin32\bin

After doing these steps, when I am running import libtiff, the following error is coming:

OSError                                   Traceback (most recent call last)
<ipython-input-1-3fa0885ae753> in <module>
     20 import os
     21 import pickle
---> 22 from libtiff import TIFF
     23 import libtiff
     24 libtiff.libtiff_ctypes.suppress_warnings()

c:\users\ajain7\appdata\local\programs\python\python36\lib\site-packages\libtiff\__init__.py in <module>
     18 __all__ = ['TIFF', 'TIFF3D', 'TIFFfile', 'TiffArray', 'TiffFile', 'TiffFiles', 'TiffChannelsAndFiles', 'TiffBase']
     19 
---> 20 from .libtiff_ctypes import libtiff, TIFF, TIFF3D
     21 from .tiff import TIFFfile, TIFFimage, TiffArray
     22 from .tiff_file import TiffFile

c:\users\ajain7\appdata\local\programs\python\python36\lib\site-packages\libtiff\libtiff_ctypes.py in <module>
     48                       'PATH|LD_LIBRARY_PATH|..')
     49 
---> 50 libtiff = ctypes.cdll.LoadLibrary(lib)
     51 
     52 libtiff.TIFFGetVersion.restype = ctypes.c_char_p

c:\users\ajain7\appdata\local\programs\python\python36\lib\ctypes\__init__.py in LoadLibrary(self, name)
    424 
    425     def LoadLibrary(self, name):
--> 426         return self._dlltype(name)
    427 
    428 cdll = LibraryLoader(CDLL)

c:\users\ajain7\appdata\local\programs\python\python36\lib\ctypes\__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    346 
    347         if handle is None:
--> 348             self._handle = _dlopen(self._name, mode)
    349         else:
    350             self._handle = handle

OSError: [WinError 193] %1 is not a valid Win32 application

Answer 1

Another thing might have happened. VS code automatically searches for the numpy and other packages from predefined OS locations. You might be using the 32 bit version of numpy instead of a 64 bit version. To fix this, uninstall libtiff from all locations by typing pip uninstall libtiff