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Resize thousands of images with Python

· Java Zone

Check out this 8-step guide to see how you can increase your productivity by skipping slow application redeploys and by implementing application profiling, as you code! Brought to you in partnership with ZeroTurnaround.

Image resizer  

I created the script to resize thousands images in a single-run Python command in Linux (Ubuntu). This will also work in Windows i guess. It can resize thousands of images ( I run it before for > 50K images)

Suppose we have images stored in Folder structures like this : 

images

----  Tigers

-------------1_tigers.jpg

-------------2_tigers.jpg

-------------2_tigers.png

-------------n_tigers.jpg

---- Cats

-------------1_cats.jpg

-------------2_tcats.jpg

-------------2_cats.png

-------------n_cats.jpg

---- n

-------------1_n.jpg

-------------2_n.jpg

-------------3_n.png

-------------n_n.jpg

.............................

ans so on. 

Run the script with this steps : 

1. Open your terminal, and type

2. python resizer.py {img source folder} {the size you want the image to be} {destination folder}

   example : 

   python resizer.py /home/ubuntu/images/ 128 /home/ubuntu/new_images

3. Drink your coffee and watch the terminal running the process 

Notes: 
1. Install PIL image if you dont have one ( another library considered faster than this)
2. ANTIALIAS and quality=90 is to prevent the image from downgrading quality for Down-Scalling
3. This code works for Down-Scalling resize , yo can use another method beside ANTIALIAS for Free-Scalling
4. Images will be converted to .jpg extension ( its up to you, you can change it your way)
5. If you have different folder structures from above example, modify the code
import PIL
from PIL import Image
import os
import sys

def readf():

    try:
        input_dir  = str(sys.argv[1].rstrip('/'))  #path to img source folder
        img_size   = str(sys.argv[2])  #The image size (128, 256,etc)
        output_dir  = str(sys.argv[3].rstrip('/')) #output directory
        print "starting...."
        print "Colecting data from %s " % input_dir
        tclass = [ d for d in os.listdir( input_dir ) ]
        counter = 0
        strdc = ''
        hasil = []
        for x in tclass:
           list_dir =  os.path.join(input_dir, x )
           list_tuj = os.path.join(output_dir+'/', x+'/')
           if not os.path.exists(list_tuj):
                os.makedirs(list_tuj)
           if os.path.exists(list_tuj):
               for d in os.listdir(list_dir):
                   try:
                       img = Image.open(os.path.join(input_dir+'/'+x,d))
                       img = img.resize((int(img_size),int(img_size)),Image.ANTIALIAS)
                       fname,extension = os.path.splitext(d)
                       newfile = fname+extension
                       if extension != ".jpg" :
                           newfile = fname + ".jpg"
                       img.save(os.path.join(output_dir+'/'+x,newfile),"JPEG",quality=90)
                       print "Resizing file : %s - %s " % (x,d)

                   except Exception,e:
                        print "Error resize file : %s - %s " % (x,d)
                        sys.exit(1)

               counter +=1

    except Exception,e:
        print "Error, check Input directory etc : ", e
        sys.exit(1)

readf()

The Java Zone is brought to you in partnership with ZeroTurnaround. Check out this 8-step guide to see how you can increase your productivity by skipping slow application redeploys and by implementing application profiling, as you code!

Topics:
python

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