How to generate thumbnails from existing jpg image files.

thumb_gen.py

import glob
import Image

# HDB: set preferences here
source_extension = "*.jpg"
size = 110, 80
prefix = "t"
target_extension = "JPEG"

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