Python copy on PIL image object

I guess copy.copy() does not work for the PIL Image class. Try using Image.copy() instead, since it is there for a reason:

image = Image.open(path)
image = image.crop((left, upper, right, lower))
for size in sizes:
  temp = image.copy()  # <-- Instead of copy.copy(image)
  temp.thumbnail((size, height), Image.ANTIALIAS)
  temp.save('%s%s%s.%s' % (path, name, size, format), quality=95)