Python/PIL Resize all images in a folder

Question

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.

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()

Sanjar Stone · Accepted Answer · 2014-02-03T03:24:30.510

69

#!/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 item must be path+item

edited Feb 03 '14 at 03:24

answered Feb 03 '14 at 02:53

Sanjar Stone

874
7
7

nope...nothing worked and I still didn't receive any Traceback error. Thanks for response though – user3237883 Feb 03 '14 at 07:41
Please, check PIL again on Windows. That code working completely on Linux. – Sanjar Stone Feb 03 '14 at 08:21
5

Very true..I had my path as path = ('C:\Users\Maxxie\color\complete') instead of `path = ('C:\Users\Maxxie\color\complete\\')` So now everything works as expected...Thanks very much – user3237883 Feb 03 '14 at 09:20
3

You really should use `os.path.join()` instead of using plain concatenation. At that point you no longer need to have `path` end in a path separator either. – Martijn Pieters Jan 08 '17 at 13:19
Any way to just resize the width and have the height scale proportionally? – user1702965 Apr 03 '17 at 17:49
Is the above code is applicable for colored image also. What is mean by quality=90? – Hitesh Dec 15 '17 at 06:20
@user1702965 See my snippet below for aspect fit. – John Franke May 26 '18 at 20:33
This top-voted answer should correctly join paths: `os.path.join(path, item)` better than `path+'/'+item`. Currently your solution fails in most cases where [directory-paths do not end with a `/` or `\\\` on Win](https://stackoverflow.com/questions/980255/should-a-directory-path-variable-end-with-a-trailing-slash) - **without trailing separator**. – hc_dev Dec 26 '22 at 09:40

Andrei M. · Answer 2 · 2019-07-24T14:21:31.987

John Ottenlips's solution created pictures with black borders on top/bottom i think because he used

  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.

This fixes the problem and, in my opinion, makes the solution a bit clearer:

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()

John Franke · Answer 3 · 2018-09-27T16:29:13.240

In case you want to keep the same aspect ratio of the image you can use this script.

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()

score 5 · Answer 4 · answered Jun 10 '19 at 13:09

5

Expanding on the great solution of @Sanjar Stone

for including subfolders and also avoid DS warnings you can use the glob library:

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)

answered Jun 10 '19 at 13:09

sivi

10,654
2
52
51

This worked for me. How would I save the new files in a different directory called `resized`? I tried `imResize.save("./resized/" + filename , 'JPEG', quality=90)`, but that didn't work. (I don't use python much) – mikey Feb 10 '20 at 20:38
1

you can try without the ./ at the start or check your directory structure and python manual if that also doesn't work – sivi Feb 11 '20 at 22:11
Sometimes "../resized" will be needed that's all the option for shortcuts if they don't work you will have to write full path - that has downsize for code modularity. – sivi Feb 13 '20 at 16:30

score 2 · Answer 5 · answered Mar 22 '20 at 23:41

This code just worked for me to resize images..

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]))

score 2 · Answer 6 · answered May 04 '20 at 09:47

For those that are on Windows:

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'))

justudin · Answer 7 · 2020-10-27T05:52:30.617

Heavily borrowed the code from @Sanjar Stone. This code work well in Windows OS. Can be used to bulky resize the images and assembly back to its corresponding subdirectory.

Original folder with it subdir:
..\DATA\ORI-DIR
├─Apolo
├─Bailey
├─Bandit
├─Bella

New folder with its subdir:

..\DATA\NEW-RESIZED-DIR
├─Apolo
├─Bailey
├─Bandit
├─Bella

Gist link: https://gist.github.com/justudin/2c1075cc4fd4424cb8ba703a2527958b

from PIL import Image
import glob
import os

# new folder path (may need to alter for Windows OS)
# change path to your path
ORI_PATH = '..\DATA\ORI-DIR'
NEW_SIZE = 224
PATH = '..\DATA\NEW-RESIZED-DIR' #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(ORI_PATH+'**/*.jpg'): #path of raw images with is subdirectory
    img = Image.open(filename).resize((NEW_SIZE,NEW_SIZE))
    
    # get the original location and find its subdir
    loc = os.path.split(filename)[0]
    subdir = loc.split('\\')[1]
    
    # assembly with its full new directory
    fullnew_subdir = PATH+"/"+subdir
    name = os.path.split(filename)[1]
    
    # check if the subdir is already created or not
    if not os.path.exists(fullnew_subdir):
        os.makedirs(fullnew_subdir)
    
    # save resized images to new folder with existing filename
    img.save('{}{}{}'.format(fullnew_subdir,'/',name))

score 0 · Answer 8 · answered Nov 01 '20 at 09:32

Expanded the answer of Andrei M. In order to only change the height of the picture and automatically size the width.

from PIL import Image
import os

path = "D:/.../.../.../resized/"
dirs = os.listdir(path)

def resize():
    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)
            size = image.size

            new_image_height = 190
            new_image_width = int(size[1] / size[0] * new_image_height)

            image = image.resize((new_image_height, new_image_width), Image.ANTIALIAS)
            image.save(file_path + "_small" + extension, 'JPEG', quality=90)


resize()

score 0 · Answer 9 · answered Sep 21 '22 at 10:11

If you want to resize any image from a folder where without images files, other files also exist, then you can try this:

from genericpath import isdir
from PIL import Image
import os, sys

path = "C://...//...//....//...//"
save_path = "C://...//..//...//...//"
images = os.listdir(path)

if not os.path.isdir(save_path):
    os.makedirs(save_path)


for image in images:
    image_path = os.path.join(path, image)
    iamge_save_path = os.path.join(save_path, image)
    if image.split(".")[1] not in ["jpg", "png"]:
        continue
    if os.path.exists(image_path):
        im = Image.open(image_path)
        image_resized = im.resize((224,224))
        image_resized.save(iamge_save_path, quality=90)
        # print("saved")

hc_dev · Answer 10 · 2022-12-26T11:16:53.883

Safer to use `pathlib`

As jwal commented on a similar question, use the object-oriented counterparts for os of pathlib:

p = Path('images') to define the path instance (here as directory relative to current)
Path.iterdir() to find files in the path instance
Path.absolute() to get the absolute-path for file-IO functions
Path.joinpath(*other) to add subfolders or filenames
Path.mkdir(parents=True, exist_ok=True)
Path.name to return the basename of the file (like picture.png)

from pathlib import Path

# folder = 'images'
# new_dimension = (width, height)
def resize(folder, new_dimension, new_subdir):
    
    images_folder = Path(folder)
    for child in images_folder.iterdir():
        print("Found image:", child)
        image_path = child.absolute()

        image = Image.open(image_path)
        resized_image = image.resize()  # could also add Image.ANTIALIAS

        # create if the subdir not exists
        subdir = images_folder.join(new_subdir)
        if not subdir.exists():
            subdir.mkdir(parents=True, exist_ok=True)
        
        to_path = subdir.joinpath(child.name)  # join adds the path-separators
        print("Saving resized to:", to_path)
        resized_image.save(to_path)  # could also add save-options like 'JPEG', quality=90

Python/PIL Resize all images in a folder

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