Pillow/docs/releasenotes/3.4.0.rst

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3.4.0
-----
New resizing filters
====================
Two new filters available for ``Image.resize()`` and ``Image.thumbnail()``
functions: ``BOX`` and ``HAMMING``. ``BOX`` is the high-performance filter with
two times shorter window than ``BILINEAR``. It can be used for image reduction
3 and more times and produces a more sharp result than ``BILINEAR``.
``HAMMING`` filter has the same performance as ``BILINEAR`` filter while
providing the image downscaling quality comparable to ``BICUBIC``.
Both new filters don't show good quality for the image upscaling.
Append images to GIF
====================
Additional frames can now be appended when saving a GIF file, through the
``append_images`` argument. The new frames are passed in as a list of images,
which may be have multiple frames themselves.
Note that the ``append_images`` argument is only used if ``save_all`` is also
in effect, e.g.::
im.save(out, save_all=True, append_images=[im1, im2, ...])