Do Megapixels Matter?
November 27th, 2006David Pogue, a technology writer for the New York Times, had three 16×24 photo prints made at a professional photo lab. They were the same picture, taken at 5, 8, and 13 megapixels. In an unscientific survey, random pedestrians were unable to tell the difference. Out of the dozens of people who tried, only one was able to correctly identify which print went with with megapixel size—and she was a photography professor.
Link: http://pogue.blogs.nytimes.com/…
(via Lifehacker)