Video: Megapixel Myth Explained

Norman Koren, an image quality expert explains the Megapixel Myth at PMAI 2007.

“Increasing the number of pixels does not always increase image quality, there is an optimum number and cosumers need to be educated that you really have to measure what a camera does because it depends on the lens, the sensor, the signal processing, and what you do afterwards, the post processing. The megapixel count has some meaning but it gets exagerated”


“As the megapixel count increases, the size of the pixels decrease, and as they decrease, first of all it’s harder for the lens to focus sharply on the pixels, so images are spread among pixels, your not really using them. Secondly, the number of photons that are reaching the pixels decreases and the noise increases, also the dynamic range, the range from light to dark decreases.”

“So very often when pixels get very small, when your getting up in to that 12 megapixel category in a small point and shoot (not a DSLR where you can use them). But in a small point and shoot the large megapixel count will actually make the overall image quality go down, you’ll see grit and grain and noise.”

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