This functions resizes all the images for a given size in a given directory. It saves the output to another directory.

ResizeImagesInDir.py

'''
ImageDir: all the images to bre resized are in this directory
SaveDir: resized images to be saved in this directory
TargetSize: New size of the images
'''

from PIL import Image
def resize(ImageDir,SaveDir,TargetSize):
  p=os.getcwd()
  os.chdir(ImageDir)
  for imgs in os.listdir():
    image = Image.open(imgs)
    new_image = image.resize(TargetSize)
    new_image.save(SaveDir+r"/"+str(imgs))
  os.chdir(p)