Pixel Nomenclature in Samsung Digital Cameras.
You may have noticed that the number of pixels and the maximum resolution don't quite compute. For example, a 2.1-megapixel Samsung camera can produce images with a resolution of 1600x1200, or 1,920,000 pixels. But "2.1 megapixel" means there should be at least 2,100,000 pixels.
This isn't an error from rounding off or binary mathematical trickery. There is a real discrepancy between these numbers because the CCD( Charge-coupled device ) has to include circuitry for the ADC( Analog-to-digital converter ) to measure the charge. This circuitry is dyed black so that it doesn't absorb light and distort the image.