Scan Image for Blank Spots using PIL

Hello,
I want to use PIL to scan a newly created image for possible corrupt (blank)
pixels.

The PIL documentation doesn't seem to mention what value a blank pixel might
have (I assume it would come back as None).  I'm not sure what to test for.

I see the Image module has a verify
function<http://www.pythonware.com/library/pil/handbook/image.htm>,
but I'm not sure if that covers validating that pixels are not blank.

Any ideas?

Thanks

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