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Date: Thu, 2 Jun 2011 18:28:28 -0700 (PDT)
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Subject: Re: Why is this so much faster?
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:6901

Thanks for the fast responses.

Tim, you're right I did have my lambda parameters the wrong way round.
Fixing up the order had no effect on the speed (platform is x64 win7).

Ian, I was basing my code off Fredrik Lundh post on comparing images.
http://effbot.org/zone/pil-comparing-images.htm

Terry, I will try replacing the pow function next.