Source code for PIL.ImageSequence

#
# The Python Imaging Library.
# $Id$
#
# sequence support classes
#
# history:
# 1997-02-20 fl     Created
#
# Copyright (c) 1997 by Secret Labs AB.
# Copyright (c) 1997 by Fredrik Lundh.
#
# See the README file for information on usage and redistribution.
#

##


[docs]class Iterator(object): """ 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. """ def __init__(self, im): if not hasattr(im, "seek"): raise AttributeError("im must have seek method") self.im = im self.position = getattr(self.im, "_min_frame", 0) def __getitem__(self, ix): try: self.im.seek(ix) return self.im except EOFError: raise IndexError # end of sequence def __iter__(self): return self def __next__(self): try: self.im.seek(self.position) self.position += 1 return self.im except EOFError: raise StopIteration def next(self): return self.__next__()
def all_frames(im, func=None): """ 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. """ if not isinstance(im, list): im = [im] ims = [] for imSequence in im: current = imSequence.tell() ims += [im_frame.copy() for im_frame in Iterator(imSequence)] imSequence.seek(current) return [func(im) for im in ims] if func else ims