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This class implements an iterator object that can be used to loop
over an image sequence.
You can use the ``[]`` operator to access elements by index. This operator
will raise an :py:exc:`IndexError` if you try to access a nonexistent
frame.
:param im: An image object.
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Applies a given function to all frames in an image or a list of images.
The frames are returned as a list of separate images.
:param im: An image, or a list of images.
:param func: The function to apply to all of the image frames.
:returns: A list of images.
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