This little script will help us to get the images straight for our website.

compress.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function
import os, sys
from PIL import Image

size = (768,512)

def compress(files,
        output_format="JPEG",
        jpg_quality=100,
        out_file_name_postfix=".small"):
    """Compress a list of images to smaller versions.
    """

    for infile in files:
        f, e = os.path.splitext(infile)
        outfile = f + out_file_name_postfix + ".jpg"
        print("processing '{}' to '{}'".format(infile, outfile))
        if infile != outfile:
            try:
                im = Image.open(infile)
                im.thumbnail(size)
                im.save(outfile, output_format, quality=jpg_quality)
            except IOError:
                print("unable to convert '{}'".format(infile))

if __name__ == "__main__":
    compress(sys.argv[1:])