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To process multi-band images, use the :py:meth:`~PIL.Image.Image.split` method or :py:func:`~PIL.Image.merge` function. :param expression: A function that receives a dictionary. :param **kw: Values to add to the function's dictionary. :return: The expression result. This is usually an image object, but can also be an integer, a floating point value, or a pixel tuple, depending on the expression. ) opscopyupdateitemsrrr r r0)rrargskvr8s r lambda_evalrs88::DKKOOO ""1 a % % "qkkDG *T  Cv  sB BBc t|D]0}d|vstt|rd|d}t |1|D]1\}}t|tjrt||<2t|ddd fd tj |d } |j S#t$r|cYSwxYw) a- Evaluates an image expression. This uses Python's ``eval()`` function to process the expression string, and carries the security risks of doing so. It is not recommended to process expressions without considering this. :py:meth:`~lambda_eval` is a more secure alternative. :py:mod:`~PIL.ImageMath` only supports single-layer images. 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