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Copies of an image do not retain the format [ci skip]

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Andrew Murray 2021-06-10 09:18:14 +10:00
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docs/handbook/image-file-formats.rst
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@ -13,6 +13,14 @@ contents, not their names, but the :py:meth:`~PIL.Image.Image.save` method
looks at the name to determine which format to use, unless the format is given
explicitly.
When an image is opened from a file, only that instance of the image is considered to
have the format. Copies of the image will contain data loaded from the file, but not
the file itself, meaning that it can no longer be considered to be in the original
format. So if :py:meth:`~PIL.Image.Image.copy` is called on an image, or another method
internally creates a copy of the image, the ``fp`` (file pointer), along with any
methods and attributes specific to a format. The :py:attr:`~PIL.Image.Image.format`
attribute will be `None`.
Fully supported formats
-----------------------