从子文件夹中读取所有图像，调整它们的大小并在 Python 中使用它们的原始名称保存它们？

Question

I want to read all images from a different subfolder, resize them and save them with their original name. However, I get the error shown below. How do I fix this error?

example code:

from PIL import Image

import os

size = (112, 112)

def resize_img(path,dest_path):

    name_list = []
    label_list = []
    resized_list = []
    if not os.path.exists(dest_path):
        os.makedirs(dest_path)
    folder_list = os.listdir(path)
    for num_imgs,folder in enumerate(folder_list):
        print(str(num_imgs) + " : " + folder)
        files_path = path + "/" + folder
        image_list = os.listdir(files_path)
        name_list.append(folder)
        for image_name in image_list:
            image_path = path + "/" + folder + "/" + image_name
            print(image_path)
            img = Image.open(image_path)
            label_list.append(img)
            for image in label_list:
                image = image.resize((112, 112))
                resized_list.append(image)
                for (i,new) in enumerate (resized_list):
                    new.save('{}{}{}'.format(dest_path+'/'+str(label_list)+str('_'), i+1, '.jpg'))

resize_img('C:/Users/aunglay/PycharmProjects/FR_using_cnn/Face_database',
           'C:/Users/aunglay/PycharmProjects/FR_using_cnn/resized_images')

Error appeared:

Traceback (most recent call last):

  File "C:/Users/aunglay/PycharmProjects/FR_using_cnn/smaple2.py", line 30, in <module>
    'C:/Users/aunglay/PycharmProjects/FR_using_cnn/resized_images')

  File "C:/Users/aunglay/PycharmProjects/FR_using_cnn/smaple2.py", line 27, in resize_img
    new.save('{}{}{}'.format(dest_path+'/'+str(label_list)+str('_'), i+1, '.jpg'))

  File "C:\Users\aunglay\Anaconda3\envs\tensorflow_env\lib\site-packages\PIL\Image.py", line 2099, in save
    fp = builtins.open(filename, "w+b")
OSError: [Errno 22] Invalid argument: 'C:/Users/aunglay/PycharmProjects/FR_using_cnn/resized_images/[<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=64x64 at 0x2D7ACFD508>]_1.jpg'

Answer 1

The problem seems to be in the last line of the code:

new.save('{}{}{}'.format(dest_path+'/'+str(label_list)+str('_'), i+1, '.jpg'))

Specifically, label_list will be a list of image objects and will not contain the name of the image you just read. Plus, I think the last two for loops are not necessary. You could change the code:

for image_name in image_list:
        image_path = path + "/" + folder + "/" + image_name
        print(image_path)
        img = Image.open(image_path)
        label_list.append(img)
        for image in label_list:
            image = image.resize((112, 112))
            resized_list.append(image)
            for (i,new) in enumerate (resized_list):
                new.save('{}{}{}'.format(dest_path+'/'+str(label_list)+str('_'), i+1, '.jpg'))

to:

for image_name in image_list:
        image_path = path + "/" + folder + "/" + image_name
        print(image_path)
        img = Image.open(image_path)
        label_list.append(img)
        resized_list.append(img.resize((112, 112)))
        resized_list[-1].save(dest_path+'/'+image_name+'.jpg')

And that should implement what you describe.

edit: concerning what was asked in the comments:

def resize_img(path,dest_path):

   name_list = []
   label_list = []
   resized_list = []
   folder_list = os.listdir(path)
   for num_imgs,folder in enumerate(folder_list):
       if not os.path.exists(dest_path+'/'+folder):
           os.makedir(dest_path+'/'+folder)
       print(str(num_imgs) + " : " + folder)
       files_path = path + "/" + folder
       image_list = os.listdir(files_path)
       name_list.append(folder)
       for image_name in image_list:
          image_path = path + "/" + folder + "/" + image_name
          print(image_path)
          img = Image.open(image_path)
          label_list.append(img)
          resized_list.append(img.resize((112, 112)))
          resized_list[-1].save(dest_path+'/'+folder+'/'+image_name+'.jpg'

This should implement what you were describing. You need to call os.mkdir() for each of the sub-folders you want to create, thus it has to be inside the first for loop.