I notice that when I'm shooting outdoors when it is freezing cold, the digital noise is very rough and visible on my camera (fuji s5000). i heard some voices that low temperatures can cause that digital noise appears in the pictures. but can anybody explain me this from technixal point of view? what's happening then on the sensor? does it need a "special" temperature when it works properly and the noise level is normal? and... can low temperatures harm my sensor? technically speaking?