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This reader is based on the specification available from:
https://www.flipcode.com/archives/Quake_2_BSP_File_Format.shtml
and has been tested with a few sample files found using google.

.. note::
    This format cannot be automatically recognized, so the reader
    is not registered for use with :py:func:`PIL.Image.open()`.
    To open a WAL file, use the :py:func:`PIL.WalImageFile.open()` function instead.
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