Pillow thumbnail 图片缩放

%matplotlib inline
from PIL import Image
import matplotlib.pyplot as plt

img = Image.open('image.png')
w,h = img.size

plt.imshow(img)

<matplotlib.image.AxesImage at 0x7f4631ad0710>

<matplotlib.image.AxesImage at 0x7f46200758d0>

help(img.thumbnail)

Help on method thumbnail in module PIL.Image:

thumbnail(size, resample=3) method of PIL.PngImagePlugin.PngImageFile instance
    Make this image into a thumbnail.  This method modifies the
    image to contain a thumbnail version of itself, no larger than
    the given size.  This method calculates an appropriate thumbnail
    size to preserve the aspect of the image, calls the
    :py:meth:`~PIL.Image.Image.draft` method to configure the file reader
    (where applicable), and finally resizes the image.
    
    Note that this function modifies the :py:class:`~PIL.Image.Image`
    object in place.  If you need to use the full resolution image as well,
    apply this method to a :py:meth:`~PIL.Image.Image.copy` of the original
    image.
    
    :param size: Requested size.
    :param resample: Optional resampling filter.  This can be one
       of :py:attr:`PIL.Image.NEAREST`, :py:attr:`PIL.Image.BILINEAR`,
       :py:attr:`PIL.Image.BICUBIC`, or :py:attr:`PIL.Image.LANCZOS`.
       If omitted, it defaults to :py:attr:`PIL.Image.BICUBIC`.
       (was :py:attr:`PIL.Image.NEAREST` prior to version 2.5.0)
    :returns: None