如何使用 PIL 调整图像大小并保持其纵横比?

问题描述：

是否有明显的方法可以做到这一点，但我缺少这种方法?我只是想制作缩略图.

Is there an obvious way to do this that I'm missing? I'm just trying to make thumbnails.

答

定义最大尺寸.然后，通过取min(maxwidth/width, maxheight/height)来计算调整大小比例.

Define a maximum size. Then, compute a resize ratio by taking min(maxwidth/width, maxheight/height).

合适的尺寸是oldsize*ratio.

当然还有一个库方法可以做到这一点:方法Image.thumbnail.
下面是 PIL 文档中的(经过编辑的)示例.

There is of course also a library method to do this: the method Image.thumbnail.
Below is an (edited) example from the PIL documentation.

import os, sys
import Image

size = 128, 128

for infile in sys.argv[1:]:
    outfile = os.path.splitext(infile)[0] + ".thumbnail"
    if infile != outfile:
        try:
            im = Image.open(infile)
            im.thumbnail(size, Image.ANTIALIAS)
            im.save(outfile, "JPEG")
        except IOError:
            print "cannot create thumbnail for '%s'" % infile

如何使用 PIL 调整图像大小并保持其纵横比?

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