What a nifty script!  I love it!
Here's my version.  I tested using a 800 KByte image file and it runs
in a blink. Dictionary access in Python is very fast.
<code>
counter = {}

for bytes in open('c:\\temp\\16.jpg', "rb").read():
   try:
       counter[bytes] += 1
   except KeyError:
       counter[bytes] = 1

for key in sorted(counter.keys()):
    print '%s: %d,' % (repr(key),counter[key]),
print
</code>
--
Vernon
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