Why blurring sensitive information is a bad idea – dheera.net: Dheera Venkatraman’s web site.
I have wondered why things are blurred instead of just colored black, and the only reason I have come up with is that blurring looks better, especially if applied to a face, but when it comes to blurring out an account number that is just stupid. In that case it looks the same no matter what method is used.