Python/PIL 调整文件夹中所有图像的大小
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Python/PIL Resize all images in a folder
提问by user3237883
I have the following code that I thought would resize the images in the specified path But when I run it, nothing works and yet python doesn't throw any error so I don't know what to do. Please advise. Thanks.
我有以下代码，我认为可以调整指定路径中图像的大小但是当我运行它时，没有任何作用，但是 python 没有抛出任何错误，所以我不知道该怎么做。请指教。谢谢。
from PIL import Image
import os, sys
path = ('C:\Users\Maxxie\color\complete')
def resize():
for item in os.listdir(path):
if os.path.isfile(item):
im = Image.open(item)
f, e = os.path.splitext(item)
imResize = im.resize((200,200), Image.ANTIALIAS)
imResize.save(f + ' resized.jpg', 'JPEG', quality=90)
resize()
采纳答案by Sanjar Stone
#!/usr/bin/python
from PIL import Image
import os, sys
path = "/root/Desktop/python/images/"
dirs = os.listdir( path )
def resize():
for item in dirs:
if os.path.isfile(path+item):
im = Image.open(path+item)
f, e = os.path.splitext(path+item)
imResize = im.resize((200,200), Image.ANTIALIAS)
imResize.save(f + ' resized.jpg', 'JPEG', quality=90)
resize()
Your mistake is belong to full path of the files. Instead of itemmust be path+item
您的错误属于文件的完整路径。而不是项目必须是路径+项目
回答by John Ottenlips
In case you want to keep the same aspect ratio of the image you can use this script.
如果您想保持图像的相同纵横比，您可以使用此脚本。
from PIL import Image
import os, sys
path = "/path/images/"
dirs = os.listdir( path )
final_size = 244;
def resize_aspect_fit():
for item in dirs:
if item == '.DS_Store':
continue
if os.path.isfile(path+item):
im = Image.open(path+item)
f, e = os.path.splitext(path+item)
size = im.size
ratio = float(final_size) / max(size)
new_image_size = tuple([int(x*ratio) for x in size])
im = im.resize(new_image_size, Image.ANTIALIAS)
new_im = Image.new("RGB", (final_size, final_size))
new_im.paste(im, ((final_size-new_image_size[0])//2, (final_size-new_image_size[1])//2))
new_im.save(f + 'resized.jpg', 'JPEG', quality=90)
resize_aspect_fit()
回答by sivi
Expanding on the great solution of @Sanjar Stone
扩展@Sanjar Stone 的出色解决方案
for including subfolders and also avoid DS warnings you can use the glob library:
为了包含子文件夹并避免 DS 警告，您可以使用 glob 库：
from PIL import Image
import os, sys
import glob
root_dir = "/.../.../.../"
for filename in glob.iglob(root_dir + '**/*.jpg', recursive=True):
print(filename)
im = Image.open(filename)
imResize = im.resize((28,28), Image.ANTIALIAS)
imResize.save(filename , 'JPEG', quality=90)
回答by Andrei M.
John Ottenlips's solution created pictures with black borders on top/bottom i think because he used
John Ottenlips 的解决方案在顶部/底部创建了带有黑色边框的图片，我认为是因为他使用了
Image.new("RGB", (final_size, final_size))
which creates a square new image with the final_size as dimension, even if the original picture was not a square.
即使原始图片不是正方形，它也会创建一个以 final_size 为维度的方形新图像。
This fixes the problem and, in my opinion, makes the solution a bit clearer:
这解决了问题，并且在我看来，使解决方案更加清晰：
from PIL import Image
import os
path = "C:/path/needs/to/end/with/a/"
resize_ratio = 0.5 # where 0.5 is half size, 2 is double size
def resize_aspect_fit():
dirs = os.listdir(path)
for item in dirs:
if item == '.jpg':
continue
if os.path.isfile(path+item):
image = Image.open(path+item)
file_path, extension = os.path.splitext(path+item)
new_image_height = int(image.size[0] / (1/resize_ratio))
new_image_length = int(image.size[1] / (1/resize_ratio))
image = image.resize((new_image_height, new_image_length), Image.ANTIALIAS)
image.save(file_path + "_small" + extension, 'JPEG', quality=90)
resize_aspect_fit()
回答by AQEL AL KHARASANI
This code just worked for me to resize images..
此代码仅适用于我调整图像大小..
from PIL import Image
import glob
import os
# new folder path (may need to alter for Windows OS)
# change path to your path
path = 'yourpath/Resized_Shapes' #the path where to save resized images
# create new folder
if not os.path.exists(path):
os.makedirs(path)
# loop over existing images and resize
# change path to your path
for filename in glob.glob('your_path/*.jpg'): #path of raw images
img = Image.open(filename).resize((306,306))
# save resized images to new folder with existing filename
img.save('{}{}{}'.format(path,'/',os.path.split(filename)[1]))
回答by Raevel
For those that are on Windows:
对于那些在 Windows 上的人：
from PIL import Image
import glob
image_list = []
resized_images = []
for filename in glob.glob('YOURPATH\*.jpg'):
print(filename)
img = Image.open(filename)
image_list.append(img)
for image in image_list:
image = image.resize((224, 224))
resized_images.append(image)
for (i, new) in enumerate(resized_images):
new.save('{}{}{}'.format('YOURPATH\', i+1, '.jpg'))
