使用PIL在python中调整图像大小

Question

I'm trying to resize a set of images, approximatively 366, so I created a script that I tested first on 3 and it was successful.

The issue is when I process the whole folder, it returns me this error :

resizeimage.imageexceptions.ImageSizeError: 'Image is too small, Image size : (275, 183), Required size : (399, 399)'

My script is supposed to iterate an entire folder, resize images then store the output files in another folder:

import os

from PIL import Image

from resizeimage import resizeimage

path = "/Users/sigc2sige/PycharmProjects/helloworld/photos"
size = (399, 399)

for file in os.listdir(path):
    with open('/Users/sigc2sige/PycharmProjects/helloworld/photos/'+file, 'r+b') as f:
        with Image.open(f) as image:
            cover = resizeimage.resize_cover(image, size, Image.ANTIALIAS)
            cover.save('/Users/sigc2sige/PycharmProjects/helloworld/photos_2/'+file, image.format)

I did use this instruction:

thumb = ImageOps.fit(image, size, Image.ANTIALIAS) but I believe that it crops images instead of resizing them.

If you have any ideas about how to solve this issue, it would be great.

Answer 1

Downsampling an image (making it smaller) is one thing, and upsampling (making it bigger) is another thing. If you want to downsample, ANTIALIAS is a good choice, if you want to upsample, there are other filters you could use.

import os

from PIL import Image

from resizeimage import resizeimage

path = "/Users/sigc2sige/PycharmProjects/helloworld/photos"
size = (399, 399)

for file in os.listdir(path):
    with open('/Users/sigc2sige/PycharmProjects/helloworld/photos/'+file, 'r+b') as f:
        with Image.open(f) as image:
            if (image.size) >= size:
                cover = resizeimage.resize_cover(image, size, Image.ANTIALIAS)
                cover.save('/Users/sigc2sige/PycharmProjects/helloworld/photos_2/'+file, image.format)
            else:
                cover = image.resize(size, Image.BICUBIC).save('/Users/sigc2sige/PycharmProjects/helloworld/photos_2/'+file, image.format)