Playing with this and I got this odd error.

[notanark]

C:\code\sold>python driver.py flag.jpg Images
'python' is not recognized as an internal or external command,
operable program or batch file.

C:\code\sold>c:\Python27\python.exe driver.py flag.jpg Images
Reading tiles from 'Images'...
Processed 60 tiles.
Processing main image...
Main image processed.
Building mosaic, press Ctrl-C to abort...
Traceback (most recent call last):
Traceback (most recent call last):
File "driver.py", line 234, in
File "", line 1, in
File "c:\Python27\lib\multiprocessing\forking.py", line 381, in main
mosaic(sys.argv[1], sys.argv[2])
File "driver.py", line 227, in mosaic
self = load(from_parent)
File "c:\Python27\lib\pickle.py", line 1384, in load
compose(image_data, tiles_data)
File "driver.py", line 199, in compose
return Unpickler(file).load()
File "c:\Python27\lib\pickle.py", line 864, in load
Process(target=build_mosaic, args=(result_queue, all_tile_data_large, original_img_large)).start()
dispatchkey
File "c:\Python27\lib\multiprocessing\process.py", line 130, in start
File "c:\Python27\lib\pickle.py", line 886, in load_eof
self._popen = Popen(self)
File "c:\Python27\lib\multiprocessing\forking.py", line 277, in init
raise EOFError
EOFErrordump(process_obj, to_child, HIGHEST_PROTOCOL)

File "c:\Python27\lib\multiprocessing\forking.py", line 199, in dump
ForkingPickler(file, protocol).dump(obj)
File "c:\Python27\lib\pickle.py", line 224, in dump
self.save(obj)
File "c:\Python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "c:\Python27\lib\pickle.py", line 425, in save_reduce
save(state)
File "c:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\Python27\lib\pickle.py", line 655, in save_dict
self._batch_setitems(obj.iteritems())
File "c:\Python27\lib\pickle.py", line 687, in _batch_setitems
save(v)
File "c:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\Python27\lib\pickle.py", line 554, in save_tuple
save(element)
File "c:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\Python27\lib\pickle.py", line 731, in save_inst
save(stuff)
File "c:\Python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\Python27\lib\pickle.py", line 655, in save_dict
self._batch_setitems(obj.iteritems())
File "c:\Python27\lib\pickle.py", line 687, in _batch_setitems
save(v)
File "c:\Python27\lib\pickle.py", line 313, in save
(t.name, obj))
pickle.PicklingError: Can't pickle 'ImagingCore' object: <ImagingCore object at 0x02F74830>

[codebox]

I suspect this issue is similar to the one described in this StackOverflow post, I don't have a fix at the moment but would be happy to accept a patch if anyone wants to investigate