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[QUOTE=bojan;583473](because, noise being a random signal, it cannot be removed by subtraction - subtraction is the same thing as addition from the noise point of view). QUOTE]
The statement correct especially about the addition of noise but most noise on CMOS sensors is more a manufacturing issue where each pixel is more sensetive to charge than another the noise can be somewhat predictable. This is the same as white and pink noise which is a manufactured noise which can be calculated out. I noticed this when brightening up multiple images I get the bars appearing on each image in the same place. The dark dosen't show this as it is too low for the eyes to see, but once the dark is brightened is can be seen as well.
The only noise left in a camera would be chip noise which is totally random.
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