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import glob
from PIL import Image


# get all the jpg files from the current folder
for infile in glob.glob("*.jpg"):
  im = Image.open(infile).convert('RGB')
  # convert to thumbnail image
  im.thumbnail((128, 128), Image.ANTIALIAS)
  # don't save if thumbnail already exists
  if infile[0:2] != "T_":
    # prefix thumbnail file with T_
    im.save("T_" + infile, "JPEG")