multiprocessing-map.py

from multiprocessing import Pool 
from PIL import Image

SIZE = (75,75)
SAVE_DIRECTORY = 'thumbs'

def get_image_paths(folder):
  return (os.path.join(folder, f) 
      for f in os.listdir(folder) 
      if 'jpeg' in f)

def create_thumbnail(filename): 
  im = Image.open(filename)
  im.thumbnail(SIZE, Image.ANTIALIAS)
  base, fname = os.path.split(filename) 
  save_path = os.path.join(base, SAVE_DIRECTORY, fname)
  im.save(save_path)

if __name__ == '__main__':
  folder = os.path.abspath(
    '11_18_2013_R000_IQM_Big_Sur_Mon__e10d1958e7b766c3e840')
  os.mkdir(os.path.join(folder, SAVE_DIRECTORY))

  images = get_image_paths(folder)

  pool = Pool()
    pool.map(create_thumbnail, images)
    pool.close() 
    pool.join()