I have the exact same problem as described under Python: TIFFReadDirectory warning: unknown field with tag: I get tons of annoying warnings from simply loading an image. The only difference is that I'm using PyQt5 to read GeoTiff files. I tried to set up a warning filter, but can't get it right. Here is what I do:

from PyQt5 import QtGui
image = QtGui.QImage('PATH_TO_GEOTIFF')

The warning looks like

TIFFReadDirectory: Warning, Unknown field with tag XXXXX (0xYYYY) encountered.

My filter attempt was:

import warnings
warnings.filterwarnings('ignore')

but it looks like PyQt does not throw a Python warning, but something weird to stdout that the warnings module does not catch. Or am I missing something really obvious here?

I don't know how to upload a working GeoTiff, in case someone tells me how to do that, I can add a test image.

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UPDATE: I found the libtiff-5.dll in my local GIMP installation and was able to reference it the same way as in the linked question:

import ctypes
libbytiff = ctypes.CDLL(r"c:\Program Files\GIMP 2\bin\libtiff-5.dll")
libbytiff.TIFFSetWarningHandler.argtypes = [ctypes.c_void_p]
libbytiff.TIFFSetWarningHandler.restype = ctypes.c_void_p
libbytiff.TIFFSetWarningHandler(None)

But the warnings still remain.

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UPDATE 2: The only Qt-related *tif.dll I could find is c:\Python310\Lib\site-packages\PyQt5\Qt5\plugins\imageformats\qtiff.dll, but this immediately gives me AttributeError: function 'TIFFSetWarningHandler' not found.