def save(self):
    from PIL import Image
    #Original photo
    imgFile = Image.open(self.image.path)
    
    #Convert to RGB
    if imgFile.mode not in ('L', 'RGB'):
        imgFile = imgFile.convert('RGB')
    
    #Save a thumbnail for each of the given dimensions
    #The IMAGE_SIZES looks like:
    #IMAGE_SIZES = { 'image_web'      : (300, 348),
    #                'image_large'    : (600, 450),
    #                'image_thumb'    : (200, 200) }
    #each of which corresponds to an ImageField of the same name
    for field_name, size in self.IMAGE_SIZES.iteritems():
        field = getattr(self, field_name)
        working = imgFile.copy()
        working.thumbnail(size, Image.ANTIALIAS)
        fp = StringIO()
        working.save(fp, "JPEG", quality=95)
        cf = ContentFile(fp.getvalue())
        field.save(name=self.image.name, content=cf, save=False);
    
    #Save instance of Photo
    super(Photo, self).save()